Public bug reported:
[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.
** Affects: oem-priority
Importance: High
Assignee: Shengyao Xue (xueshengyao)
Status: In Progress
** Affects: oem-priority/focal
Importance: Undecided
Status: New
** Affects: nvidia-graphics-drivers-450 (Ubuntu)
Importance: Undecided
Status: New
** Tags: nvidia oem-priority originate-from-1887486 sutton
** Changed in: oem-priority
Assignee: (unassigned) => Shengyao Xue (xueshengyao)
** Changed in: oem-priority
Status: New => In Progress
** Changed in: oem-priority
Importance: Undecided => High
** Also affects: oem-priority/focal
Importance: Undecided
Status: New
** Information type changed from Proprietary to Public
** Information type changed from Public to Public Security
** Information type changed from Public Security to Private
** Information type changed from Private to Proprietary
** Information type changed from Proprietary to Public
** Also affects: nvidia-graphics-drivers-450 (Ubuntu)
Importance: Undecided
Status: New
** Tags added: nvidia oem-priority originate-from-1887486 sutton
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https://bugs.launchpad.net/bugs/1897110
Title:
[Nvidia] sometimes cannot control brightness on some high-end Lenovo
ThinkPads
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