Public bug reported:
ystem:
Ubuntu 26.04.1
Lenovo ThinkPad T14 Gen 5 Intel
Affected kernel: 7.0.0-38-generic
Working kernel: 7.0.0-34-generic
Description:
After upgrading the kernel from 7.0.0-34-generic to 7.0.0-38-generic,
screen brightness control stopped working. The display remains at
maximum brightness.
Both the keyboard brightness hotkeys and the GNOME Settings brightness
slider have no effect.
Steps to reproduce:
Boot Ubuntu 26.04.1 with kernel 7.0.0-38-generic.
Try to change screen brightness using the keyboard hotkeys.
Observe that the display brightness remains at maximum.
Reboot using kernel 7.0.0-34-generic.
Verify that brightness control works again.
Expected result: Screen brightness can be adjusted using the keyboard
hotkeys.
Actual result: Brightness is stuck at maximum with kernel
7.0.0-38-generic.
This appears to be a kernel regression. The issue is reproducible on
this hardware and disappears when booting the previous kernel.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2170625
Title:
[REGRESSION] Screen brightness stuck at 100% on Lenovo ThinkPad T14
Gen 5 Intel with kernel 7.0.0-38-generic
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