[Kernel-packages] [Bug 1805079] Re: click/pop noise in the headphone on several lenovo laptops
Hui Wang, After applying the patch to 4.20.4 (and even after removing hda-verb on module load and wake-up from sleep / hibernation), there's no noise, neither after boot nor after S3 sleep or hibernation. Yes!!! The quiet sound still remains. After testing it again (mplayer, http://www.vygo.net/hda/11-Ultimatum.ogg 4:00-4:30) I'm pretty sure the EQ is different. The bass is about 10dB lower; the middles also lower but not by as much. Thanks for your hard work, Vadim. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1805079 Title: click/pop noise in the headphone on several lenovo laptops Status in linux package in Ubuntu: Fix Committed Status in linux source package in Bionic: Fix Committed Status in linux source package in Cosmic: Fix Committed Bug description: [Impact] Lenovo told us that some linux uers reported headphone noise on Lenovo's website. After investigating, we found those Lenovo laptop mdoels all have the codec of alc285, and we can reproduce the noise problem too. [Fix] Don't use the DAC of headphone, let headphone share the DAC with speaker, the noise disappears. [Test Case] After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1 Yoda2, no noise anymore [Regression Potential] Low. This patch only apply to several lenovo machines, and after applying this patch, both speaker and headphone still work very well. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1805079] Re: click/pop noise in the headphone on several lenovo laptops
Awesome fix, Hui Wang, thank you!
I'm on Lenovo ThinkPad X1 Carbon 6th, model 20KH006JGE. After upgrading
to Linux 4.19.7, the audio mute and microphone mute LEDs (on F1 and F4
keys) stopped working. They do work if I remove the line:
{0x12, 0x90a60130},
Just removing it doesn't sound like the greatest idea, but I couldn't
find the ALC285 datasheet online. If you could direct me to information
about ALC285 registers so that I can fix the issue, or provide me with
another value for the register so that I can test it, it will be greatly
appreciated.
Many thanks,
Vadim.
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https://bugs.launchpad.net/bugs/1805079
Title:
click/pop noise in the headphone on several lenovo laptops
Status in linux package in Ubuntu:
Fix Committed
Bug description:
[Impact]
Lenovo told us that some linux uers reported headphone noise on Lenovo's
website. After investigating, we found those Lenovo laptop mdoels all
have the codec of alc285, and we can reproduce the noise problem too.
[Fix]
Don't use the DAC of headphone, let headphone share the DAC with speaker,
the noise disappears.
[Test Case]
After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1
Yoda2, no noise anymore
[Regression Potential]
Low. This patch only apply to several lenovo machines, and after applying
this patch, both speaker and headphone still work very well.
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1805079] Re: click/pop noise in the headphone on several lenovo laptops
Hi Hui Wang, I added the lines and now everything works perfectly. Thank you! -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1805079 Title: click/pop noise in the headphone on several lenovo laptops Status in linux package in Ubuntu: Fix Committed Bug description: [Impact] Lenovo told us that some linux uers reported headphone noise on Lenovo's website. After investigating, we found those Lenovo laptop mdoels all have the codec of alc285, and we can reproduce the noise problem too. [Fix] Don't use the DAC of headphone, let headphone share the DAC with speaker, the noise disappears. [Test Case] After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1 Yoda2, no noise anymore [Regression Potential] Low. This patch only apply to several lenovo machines, and after applying this patch, both speaker and headphone still work very well. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1805079] Re: click/pop noise in the headphone on several lenovo laptops
Hi Hui Wang, While waiting for your patch to reach the mainline, I just insert these two lines myself. However, I still have issues with the sound. Scenario: laptop is off, headphones are inserted, sound (both mic and output) is muted; I turn it on, log in etc., unmute the output and play something. The sound is often too quiet (maybe 10 to 15 dB weaker than expected). If I unplug the headphones and plug them back in, the sound level rises to expected levels, but I start hearing noise reminiscent of cheap soundcards (with grounding problems?), where the noise characteristics change with the activity of other devices (e.g., mouse movements). The noise is stronger if I touch the touchpad. If I mute the sound, the noise disappears. This does not happen if I remove the "0x12" line, whether or not I add the .chained/.chain_id lines. Interestingly, init_pin_configs in sysfs shows the same value for 0x12: $ cat /sys/class/sound/hwC0D0/init_pin_configs 0x12 0x90a60130 0x13 0x4000 0x14 0x90170110 0x16 0x41f0 0x17 0x41f0 0x18 0x41f0 0x19 0x04a11040 0x1a 0x41f0 0x1b 0x41f0 0x1d 0x4061 0x1e 0x41f0 0x21 0x04211020 (driver_pin_configs and user_pin_configs are empty.) Thank you, Vadim. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1805079 Title: click/pop noise in the headphone on several lenovo laptops Status in linux package in Ubuntu: Fix Committed Bug description: [Impact] Lenovo told us that some linux uers reported headphone noise on Lenovo's website. After investigating, we found those Lenovo laptop mdoels all have the codec of alc285, and we can reproduce the noise problem too. [Fix] Don't use the DAC of headphone, let headphone share the DAC with speaker, the noise disappears. [Test Case] After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1 Yoda2, no noise anymore [Regression Potential] Low. This patch only apply to several lenovo machines, and after applying this patch, both speaker and headphone still work very well. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1805079] Re: click/pop noise in the headphone on several lenovo laptops
Awesome, thank you. Let me know if you want me to run particular tests or provide information. I'm not sure if the issue manifests every time. On kernels before 4.19.7 I was hearing noise sometimes, especially after waking up from S3 sleep, but S4 hibernation or reboot (possibly turning the machine off was required) was solving it every time. I did not have the issue with quiet sound output. Have a nice weekend, Vadim. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1805079 Title: click/pop noise in the headphone on several lenovo laptops Status in linux package in Ubuntu: Fix Committed Bug description: [Impact] Lenovo told us that some linux uers reported headphone noise on Lenovo's website. After investigating, we found those Lenovo laptop mdoels all have the codec of alc285, and we can reproduce the noise problem too. [Fix] Don't use the DAC of headphone, let headphone share the DAC with speaker, the noise disappears. [Test Case] After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1 Yoda2, no noise anymore [Regression Potential] Low. This patch only apply to several lenovo machines, and after applying this patch, both speaker and headphone still work very well. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1805079] Re: click/pop noise in the headphone on several lenovo laptops
Hui Wang,
Apologies for the slow reply.
Do you mean that you also have quiet sound after the boot?
Today I upgraded to 4.19.12, and the results seem the same. I'm running
Funtoo Linux with "gentoo-sources" kernel, HDA and the Realtek codec as
modules and plain ALSA with no daemons. I tried to compile them into
the main kernel image, but the results were the same, except that the
LEDs didn't work.
Here are sone more details:
The noise level I hear does not change with the playback volume. It's
stronger when I play something (e.g., with mplayer) or touch the
touchpad.
Without the 0x12 line, alsamixer shows heasphone and speaker controls at
100%, and "alsactl store" has {Headphone,Speaker} Playback
{Volume,Switch}. Under the standard kernel (with your patch), the
aforementioned controls in alsamixer show up as "00" in a box, and
alsactl has only "Line Out Playback Volume" (and the two Switches). Is
it possible that "line out" is treated differently from "headphone" by
the hardware, or is it just a name?
With the standard kernel, the output of "alsactl store" is identical
whether the sound is in the "too quiet" state or in the "noisy
headphone" state.
Sometimes after I warm-reboot from a standard kernel to a kernel without
the 0x12 line, I hear clicks when muting and unmuting the output, or
noise, but they disappear after I play something.
I put my kernel config and alsactl store output under
http://www.vygo.net/hda/ but I don't know if it aids debugging in any
way. Do you think it may help if I try your kernel config?
Thank you for your efforts and, if appropriate, merry Christmas.
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https://bugs.launchpad.net/bugs/1805079
Title:
click/pop noise in the headphone on several lenovo laptops
Status in linux package in Ubuntu:
Fix Committed
Bug description:
[Impact]
Lenovo told us that some linux uers reported headphone noise on Lenovo's
website. After investigating, we found those Lenovo laptop mdoels all
have the codec of alc285, and we can reproduce the noise problem too.
[Fix]
Don't use the DAC of headphone, let headphone share the DAC with speaker,
the noise disappears.
[Test Case]
After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1
Yoda2, no noise anymore
[Regression Potential]
Low. This patch only apply to several lenovo machines, and after applying
this patch, both speaker and headphone still work very well.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/+subscriptions
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[Kernel-packages] [Bug 1805079] Re: click/pop noise in the headphone on several lenovo laptops
The script uploaded the info under random names, but they're the same anyway. Quiet: http://www.alsa-project.org/db/?f=7712362b1f31c1c142d4016983e648b99d8e5036 Not quiet: http://www.alsa-project.org/db/?f=579cbfe2a915281a46e449a07b4f359917191943 I also generated one without the 0x12 line: http://www.alsa-project.org/db/?f=d439ec39632f226a7c156df5373df31de28f4a53 Thank you! -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1805079 Title: click/pop noise in the headphone on several lenovo laptops Status in linux package in Ubuntu: Fix Committed Bug description: [Impact] Lenovo told us that some linux uers reported headphone noise on Lenovo's website. After investigating, we found those Lenovo laptop mdoels all have the codec of alc285, and we can reproduce the noise problem too. [Fix] Don't use the DAC of headphone, let headphone share the DAC with speaker, the noise disappears. [Test Case] After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1 Yoda2, no noise anymore [Regression Potential] Low. This patch only apply to several lenovo machines, and after applying this patch, both speaker and headphone still work very well. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1805079] Re: click/pop noise in the headphone on several lenovo laptops
Plugging the headphones during Grub doesn't seem to matter. thanks! -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1805079 Title: click/pop noise in the headphone on several lenovo laptops Status in linux package in Ubuntu: Fix Committed Bug description: [Impact] Lenovo told us that some linux uers reported headphone noise on Lenovo's website. After investigating, we found those Lenovo laptop mdoels all have the codec of alc285, and we can reproduce the noise problem too. [Fix] Don't use the DAC of headphone, let headphone share the DAC with speaker, the noise disappears. [Test Case] After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1 Yoda2, no noise anymore [Regression Potential] Low. This patch only apply to several lenovo machines, and after applying this patch, both speaker and headphone still work very well. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1805079] Re: click/pop noise in the headphone on several lenovo laptops
Hui Wang, Yes, this solves the noise issue. Both the modprobe method from Lenovo forum and the command you provided work perfectly. Thank you, and thank you James! I still have quiet sound initially. And, now that I compared it to the kernel without the 0x12 line, it seems that the sound is quieter also after replugging the headphones (which must be dome while sound is playing). It's about 20dB lower before replugging and about 10dB lower after, and perhaps less bassy, though I may be imagining things here. I'm testing it with http://www.vygo.net/hda/11-Ultimatum.ogg which has strong bass indeed. But I understand that you can reproduce it, so I trust in you :) Many thanks for solving the noise issue, and happy new year! Vadim. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1805079 Title: click/pop noise in the headphone on several lenovo laptops Status in linux package in Ubuntu: Fix Committed Bug description: [Impact] Lenovo told us that some linux uers reported headphone noise on Lenovo's website. After investigating, we found those Lenovo laptop mdoels all have the codec of alc285, and we can reproduce the noise problem too. [Fix] Don't use the DAC of headphone, let headphone share the DAC with speaker, the noise disappears. [Test Case] After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1 Yoda2, no noise anymore [Regression Potential] Low. This patch only apply to several lenovo machines, and after applying this patch, both speaker and headphone still work very well. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1805079] Re: click/pop noise in the headphone on several lenovo laptops
The two methods appear to do the same, except hda-verb applies the change when run and the other method at the time the hda kernel module is loaded. You can run hda-verb at boot instead, but the other method looks cleaner to me, as it applies the fix when the hardware is configured by the driver. I believe this fix can also be added to the driver itself. As I described above[0], after Hui Wang fixed this bug here that we're commenting on[1], I started to hear noise in headphones. This is not occasional crackling sound, this is constant annoying noise. Not every gen6 Carbon has this issue, apparently. This fixes the issue. [0] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/comments/8 [1] https://lkml.org/lkml/2018/12/4/520 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1805079 Title: click/pop noise in the headphone on several lenovo laptops Status in linux package in Ubuntu: Fix Committed Bug description: [Impact] Lenovo told us that some linux uers reported headphone noise on Lenovo's website. After investigating, we found those Lenovo laptop mdoels all have the codec of alc285, and we can reproduce the noise problem too. [Fix] Don't use the DAC of headphone, let headphone share the DAC with speaker, the noise disappears. [Test Case] After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1 Yoda2, no noise anymore [Regression Potential] Low. This patch only apply to several lenovo machines, and after applying this patch, both speaker and headphone still work very well. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1805079] Re: click/pop noise in the headphone on several lenovo laptops
Thank you! Meanwhile I use modprobe to configure the "verb", but also run hda-verb on wakeup from sleep or hibernation. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1805079 Title: click/pop noise in the headphone on several lenovo laptops Status in linux package in Ubuntu: Fix Committed Bug description: [Impact] Lenovo told us that some linux uers reported headphone noise on Lenovo's website. After investigating, we found those Lenovo laptop mdoels all have the codec of alc285, and we can reproduce the noise problem too. [Fix] Don't use the DAC of headphone, let headphone share the DAC with speaker, the noise disappears. [Test Case] After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1 Yoda2, no noise anymore [Regression Potential] Low. This patch only apply to several lenovo machines, and after applying this patch, both speaker and headphone still work very well. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1805079] Re: click/pop noise in the headphone on several lenovo laptops
Hui Wang, BTW, in case the sound card distinguishes between headphone out and line out modes, thus may be relevant: my headphones have impedance of 70Ω. Vadim. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1805079 Title: click/pop noise in the headphone on several lenovo laptops Status in linux package in Ubuntu: Fix Committed Bug description: [Impact] Lenovo told us that some linux uers reported headphone noise on Lenovo's website. After investigating, we found those Lenovo laptop mdoels all have the codec of alc285, and we can reproduce the noise problem too. [Fix] Don't use the DAC of headphone, let headphone share the DAC with speaker, the noise disappears. [Test Case] After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1 Yoda2, no noise anymore [Regression Potential] Low. This patch only apply to several lenovo machines, and after applying this patch, both speaker and headphone still work very well. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1805079] Re: click/pop noise in the headphone on several lenovo laptops
Hui Wang, Do you have a patch to set the values? I don't run Ubuntu. Is there a publicly accessible branch with -proposed patches? Thank you! -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1805079 Title: click/pop noise in the headphone on several lenovo laptops Status in linux package in Ubuntu: Fix Committed Status in linux source package in Bionic: Fix Committed Status in linux source package in Cosmic: Fix Committed Bug description: [Impact] Lenovo told us that some linux uers reported headphone noise on Lenovo's website. After investigating, we found those Lenovo laptop mdoels all have the codec of alc285, and we can reproduce the noise problem too. [Fix] Don't use the DAC of headphone, let headphone share the DAC with speaker, the noise disappears. [Test Case] After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1 Yoda2, no noise anymore [Regression Potential] Low. This patch only apply to several lenovo machines, and after applying this patch, both speaker and headphone still work very well. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1805079] Re: click/pop noise in the headphone on several lenovo laptops
Hui Wang, Without the 0x12 line (but with the rest of your patch) there is no noise. Likewise, with your patch (standard kernel), running hda-verb or loading the module with the equivalent options also stops the noise. Additionally, with your full patch the sound is 10dB lower (or 20dB lower before replugging the headphones) than without the 0x12 line. Thanks, Vadim. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1805079 Title: click/pop noise in the headphone on several lenovo laptops Status in linux package in Ubuntu: Fix Committed Status in linux source package in Bionic: Fix Committed Status in linux source package in Cosmic: Fix Committed Bug description: [Impact] Lenovo told us that some linux uers reported headphone noise on Lenovo's website. After investigating, we found those Lenovo laptop mdoels all have the codec of alc285, and we can reproduce the noise problem too. [Fix] Don't use the DAC of headphone, let headphone share the DAC with speaker, the noise disappears. [Test Case] After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1 Yoda2, no noise anymore [Regression Potential] Low. This patch only apply to several lenovo machines, and after applying this patch, both speaker and headphone still work very well. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1805079] Re: click/pop noise in the headphone on several lenovo laptops
Hui Wang,
Apologies for the slow reply.
Do you mean that you also have quiet sound after the boot?
Today I upgraded to 4.19.12, and the results seem the same. I'm running
Funtoo Linux with "gentoo-sources" kernel, HDA and the Realtek codec as
modules and plain ALSA with no daemons. I tried to compile them into
the main kernel image, but the results were the same, except that the
LEDs didn't work.
Here are sone more details:
The noise level I hear does not change with the playback volume. It's
stronger when I play something (e.g., with mplayer) or touch the
touchpad.
Without the 0x12 line, alsamixer shows heasphone and speaker controls at
100%, and "alsactl store" has {Headphone,Speaker} Playback
{Volume,Switch}. Under the standard kernel (with your patch), the
aforementioned controls in alsamixer show up as "00" in a box, and
alsactl has only "Line Out Playback Volume" (and the two Switches).
With the standard kernel, the output of "alsactl store" is identical
whether the sound is in the "too quiet" state or in the "noisy
headphone" state.
Sometimes after I warm-reboot from a standard kernel to a kernel without
the 0x12 line, I hear clicks when muting and unmuting the output, or
noise, but they disappear after I play something (e.g., with mplayer).
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1805079
Title:
click/pop noise in the headphone on several lenovo laptops
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Bionic:
Fix Committed
Status in linux source package in Cosmic:
Fix Committed
Bug description:
[Impact]
Lenovo told us that some linux uers reported headphone noise on Lenovo's
website. After investigating, we found those Lenovo laptop mdoels all
have the codec of alc285, and we can reproduce the noise problem too.
[Fix]
Don't use the DAC of headphone, let headphone share the DAC with speaker,
the noise disappears.
[Test Case]
After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1
Yoda2, no noise anymore
[Regression Potential]
Low. This patch only apply to several lenovo machines, and after applying
this patch, both speaker and headphone still work very well.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/+subscriptions
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[Kernel-packages] [Bug 1805079] Re: click/pop noise in the headphone on several lenovo laptops
(sorry about comment #34, please disregard) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1805079 Title: click/pop noise in the headphone on several lenovo laptops Status in linux package in Ubuntu: Fix Committed Status in linux source package in Bionic: Fix Committed Status in linux source package in Cosmic: Fix Committed Bug description: [Impact] Lenovo told us that some linux uers reported headphone noise on Lenovo's website. After investigating, we found those Lenovo laptop mdoels all have the codec of alc285, and we can reproduce the noise problem too. [Fix] Don't use the DAC of headphone, let headphone share the DAC with speaker, the noise disappears. [Test Case] After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1 Yoda2, no noise anymore [Regression Potential] Low. This patch only apply to several lenovo machines, and after applying this patch, both speaker and headphone still work very well. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
