** 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
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
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
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
--
You
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
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
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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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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> 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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