Andreas Hasenack, this bug was reported a while ago and there hasn't
been any activity in it recently. We were wondering if this is still an
issue? If so, could you please test for this with the latest development
release of Ubuntu? ISO images are available from
http://cdimage.ubuntu.com/daily-live
This issue affects people at least one and half years and nothing
happens.
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Title:
"reduce brightness" key freezes system
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Hi Licanueto,
Can you upload the information of Dell N5010? Doing like the "bug
description" and attachments for this bug.
Thanks
-Youquan
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Title
Hi there, same here with a fresh 12.10.
I'm on a Dell N5010 without any video card, just intel HD graphics
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Title:
"reduce brightness" key freeze
Hello everyone,
Please note that I'm experiencing the same problem on a Lenovo W520
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Title:
"reduce brightness" key freezes system
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This issue comes from broken BIOS SMI (like generated when you kick
specifica keys etc) hang because it does not aware of OS in x2apic mode.
So the workround way is to blacklist issued platform.
Yes. there are other T420 platforms have the issue
(https://launchpadlibrarian.net/109393850/dmidecode
Isn't this patch a bit naive? It would disable x2apic on my machine even
in the scenario where the bug doesn't happen, like when I have nvidia
disabled and only the intel graphics card enabled.
Also, is that simple string comparison seems brittle. Aren't there other
submodels of these laptops that
Hi Lukas,
No. this bug is about BIOS SMI broken in x2APIC mode.
While the bug at https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1007765
does not enable x2APIC at all.
so there are different bugs.
Thanks
-Youquan
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Hi,
couldn't this one be a duplicate of
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1007765 or the other way
around?
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Title:
"reduce br
** Tags added: patch
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Title:
"reduce brightness" key freezes system
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Please try to apply the attached patch to 3.7-rc kernel, then try if it
issue is fixed or not.
** Patch added: "set-x2apic-blacklist.patch"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/922037/+attachment/3442662/+files/0001-x86-apic-set-x2apic-blacklist.patch
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Didn't work. I was able to reproduce the problem with the live "cd" from
quantal, 64bits.
I downloaded the ISO just now, created a bootable pendrive, booted from
it and in the desktop, once loaded, hit the key to dimm the backlight.
Instant hard lock.
So, the problem happens in quantal, 64bits, w
I just updated the BIOS using the bootable CD from lenovo's support site
(worked nicely, btw!):
root@nsn7:~# dmidecode -s bios-version
83ET72WW (1.42 )
I will try a 64bit install this weekend.
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Hi,
Can you update ThinkPad T420 BIOS to at least version 1.39, Version:
83ET69WW (1.39 ), then have a try to enable x2apic.
Thanks
-Youquan
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Tit
The same happens with the Thinkpad Edge E220S, in which the F7/8 keys
hang the system with x2apic is enabled. When this happens, even the
Thinklight stops responding (eventhough it responds during a kernel
panic). I suspect that the BIOS just doesn't know how to handle x2apic
mode, causing the enti
Ok, so this is the summary about what we found so far regarding this
bug:
- The freeze happens only on x86_64, because it has the interrupt
remapping/x2apic and it is enabled, compared to the 32 bits version.
- The freeze only happens with x2apic and interrupt remapping. Interrupt
remapping and
Here is the dmesg output with nox2apic and debug.
** Attachment added: "dmesg.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/922037/+attachment/2736153/+files/dmesg.txt
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ht
I tried booting with some kernel options, here are the results. Kernel was
3.2.0-14-generic #23 x86_64:
- nointremap: no freeze
- nox2apic: no freeze
- x2apic_phys: didn't boot properly, corrupted graphics and eventually froze on
its own
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I updated the BIOS of this laptop from 1.33 to 1.37, no change.
I then installed precise alpha 2 and upgraded, also no change. Still
freezes.
Finally, I reinstalled precise alpha 2 but 32bits, not 64 as I had
before, and now it works. I can dimm the backlight without having the
laptop freeze.
--
Hm, LP ate my previous comment.
Thanks Herton, that kernel booted, but the freeze problem is still
there. As soon as I press Fn+End to decrease the brightness, the machine
locks up. Not even the caps lock led reacts.
** Tags removed: kernel-unable-to-test-upstream
** Tags added: kernel-bug-exists
Andreas, can you try booting with intel_iommu=off kernel parameter? I
think you hit another issue in 3.2, or try the newer 3.2.2 build from
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.2.2-precise/, which
should have intel_iommu disabled by default.
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Sorry, the machine wouldn't boot with the Precise kernel
3.2.0-030200-generic_3.2.0-030200.201201042035.
The boot would start, but then the screen would be filled with error
messages about some DMA read (see attached photo).
** Attachment added: "IMG_3162.JPG"
https://bugs.launchpad.net/ubunt
Would it be possible for you to test the latest upstream kernel? It
will allow additional upstream developers to examine the issue. Refer to
https://wiki.ubuntu.com/KernelMainlineBuilds . If possible, please test
the latest v3.2 kernel[1] (Not a kernel in the daily directory). Once
you've tested
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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Title:
"reduce brightness" key freezes system
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