@burger.ga — This looks like a different problem, as far as I can tell.
I suggest asking on Ubuntu Discourse for some help to diagnose and fix
this.
https://discourse.ubuntu.com/
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Update for me: I have kernel 6.8.0-48.
Hardware: Dell OptiPlex 5480 AIO All-In-One with a touchscreen monitor.
When I use both "intel_iommu=igfx_off" and "acpi_backlight=native", this
solves both this bug and bug #2049248. Without those extras, I continue
to have problems.
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I have kernel 6.8.0-48, and unfortunately my screen still blanks.
Hardware: Dell OptiPlex 5480 AIO All-In-One with a touchscreen monitor
As reported in bug #2078054 (marked as a duplicate of this one).
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@rebbel — You haven't told us what error you received. My guess is that
you need to use sudo.
Do this:
1. Enter "sudo su" (without the quotation marks). It'll ask you for your
password.
2. Enter the entire "cat" command again.
3. Enter "exit" (without the quotation marks).
Then you can continu
Update: One of the devs from Zabbly has advised me, and his workaround
has helped me.
Add "acpi_backlight=native" to the kernel command line.
To do this, edit /etc/default/grub, locate GRUB_CMDLINE_LINUX_DEFAULT,
and add "acpi_backlight=native". Finish with "sudo update-grub".
This isn't a solut
If a dev looks at this bug, please note that a possible solution is
posted in GitHub Zabbly bug 26 [1].
https://github.com/zabbly/linux/issues/26
I have contacted that dev directly, and I hope to get a response.
** Bug watch added: github.com/zabbly/linux/issues #26
https://github.com/zabbly/
I've updated to kernel 6.8.0-44 on Ubuntu 22.04, via Pre-released
updates (jammy-proposed), and unfortunately it doesn't solve the
blanking problem, nor does it solve bug #2049248.
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Update:
This is still broken on kernel 6.8.0-44.
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https://bugs.launchpad.net/bugs/2049248
Title:
Kernel 6.5 breaks display brightness controls and sets it t
Alas, the latest update from the Zabbly line no longer works after the
last update :(
** Description changed:
Since kernel 6.5, monitor brightness is set to 100%, and cannot be
changed: The brightness controls have disappeared from Settings, and
brightness doesn't respond to the keypad cont
Further to my comment #75, the workaround no longer works after the
latest update.
It worked with kernel linux-image-6.10.6-zabbly+ but no longer works
with kernel linux-image-6.10.7-zabbly+
This is incredibly frustrating and upsetting.
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To add some useful information to this, a workaround (explained in
duplicate bug #2078054) is to install the Zabbly mainline kernel [1].
This also seems to be related to bug #2049248 (but not a duplicate).
As far as I can tell, this affects certain Intel displays, though I
could be wrong.
[1] ht
** Description changed:
Since kernel 6.5, monitor brightness is set to 100%, and cannot be
changed: The brightness controls have disappeared from Settings, and
brightness doesn't respond to the keypad controls.
See the attached screenshot, showing the difference between the settings
i
Public bug reported:
Since kernel 6.8, the screen has been going black intermittently and
unpredictably for several seconds. Sometimes it happens several times in
a row over half a minute or so, and other times just once. It happens
regularly.
dmesg shows this type of error every time:
[ 7912.26
There is a solution to this, albeit not the greatest. However, it does
point to how the devs can fix this.
Apparently, for reasons known only to itself, Canonical removes some of
the drivers from the kernels when releasing them.
A maintainer, Zabbly, maintains the mainline kernel but including th
** Description changed:
Since kernel 6.5, monitor brightness is set to 100%, and cannot be
changed: The brightness controls have disappeared from Settings, and
brightness doesn't respond to the keypad controls.
See the attached screenshot, showing the difference between the settings
i
Update:
This appears to be linked to the Night Light.
When Night Light is off:
• The brightness stays at whatever I set it to with xrandr. But, the
computer still boots at 100% brightness, and missing the brightness
controls.
When Night Light is on:
• The brightness resets to 100% every 60 sec
Further information:
I am using "xrandr --brightness …" in a background script that repeats
every third of a second, to keep the brightness where I need it whenever
the system resets it to 100%.
I've noticed that the system resets the brightness *exactly* every 60
seconds, with five resets over f
Latest information seems to suggest that this isn't specifically to do
with Dell (as per bug #2032174) but maybe to do with the Intel 6nn GPU.
In this thread from Ubuntu Forums, @MAFoElffen has this same problem with Intel
630, as I do:
https://ubuntuforums.org/showthread.php?t=2494260
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I have been pointed to bug #2032174. It says that it has been fixed and
ported to Jammy (22.04), but it seems that this is incorrect.
It is probably relevant to indicate my hardware, which is Dell OptiPlex 5480
All-In-One.
And my kernel is linux-signed-hwe-6.5, so maybe it wasn't ported to the HW
Public bug reported:
Since kernel 6.5, monitor brightness is set to 100%, and cannot be
changed: The brightness controls have disappeared from Settings, and
brightness doesn't respond to the keypad controls.
See the attached screenshot, showing the difference between the settings
in kernels 6.2 a
My computer is now running kernel 5.13.0-25, which works correctly.
Marking as Fix Released.
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Released
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https://
This has been marked as expired, but it is still a valid bug.
Remarking as Confirmed.
** Changed in: linux (Ubuntu)
Status: Expired => Confirmed
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https://bugs.launchpa
> Maybe upgrade to Hirsute? It uses 5.11 kernel.
Unfortunately, the bug is still present in kernel version 5.11.0-25.
In any case, for those who (like me) use the LTS versions, upgrading to
21.04 wouldn't be a solution.
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