Closing it here as this is a firmware bug not a software bug.
** Changed in: power-profiles-daemon (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/2043318
Title:
Screen keeps dimming, power mode switches to 'power saver' by itself
Status in power-profiles-daemon package in Ubuntu:
Invalid
Bug description:
Fresh installed Lenovo Thinkpad L13 Gen2
Ubuntu 23, kernel 6.5.0-10-generic #10-Ubuntu SMP PREEMPT_DYNAMIC Fri
Oct 13 13:49:38 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
Firmware updates done
In Settings -> Power, screen dimming is turned off but the screen keeps
dimming.
This is probably caused by the Power Mode being in 'Power Saver'.
After switching to 'Balanced' or 'Performance', the Power Mode switches back
to 'Power Saver' by itself, typically in 10 seconds to about a minute. This
slows down the computer and constantly dims the screen if the keyboard or mouse
is not being operated.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/power-profiles-daemon/+bug/2043318/+subscriptions
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