The issue is addressed in 450.76 driver.
** Changed in: oem-priority
Status: In Progress => Won't Fix
** Changed in: nvidia-graphics-drivers-450 (Ubuntu)
Status: New => Won't Fix
** Changed in: oem-priority/focal
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1897110
Title:
[Nvidia] sometimes cannot control brightness on some high-end Lenovo
ThinkPads
Status in OEM Priority Project:
Won't Fix
Status in OEM Priority Project focal series:
Won't Fix
Status in nvidia-graphics-drivers-450 package in Ubuntu:
Won't Fix
Bug description:
[Impact]
On some high-end Lenovo ThinkPads with dual GPUs(Intel+Nvidia), there is a
setting in BIOS to choose Hybrid Mode(means enable both Intel and Nvidia GPUs)
and Discrete Mode(means only enable Nvidia GPU)
We found that with the latest nvidia-graphics-drivers-450 (450.66), if
the laptop's BIOS change to Discrete Mode, then Ubuntu 20.04 sometimes
cannot control the monitor brightness, the fail rate is about 50%.
[Fix]
We get a new version of nvidia driver from Nvidia, 450.76, which can fix this
issue in our testing.
[Regression Risk]
Low, upstream driver.
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