[Nvidia] sometimes cannot control brightness on some high-end Lenovo ThinkPads

Bug #1897110 reported by Shengyao Xue
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
OEM Priority Project
Won't Fix
High
Shengyao Xue
Focal
Won't Fix
Undecided
Unassigned
nvidia-graphics-drivers-450 (Ubuntu)
Won't Fix
Undecided
Unassigned

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.

Changed in oem-priority:
assignee: nobody → Shengyao Xue (xueshengyao)
status: New → In Progress
importance: Undecided → High
information type: Proprietary → Public
information type: Public → Public Security
information type: Public Security → Private
information type: Private → Proprietary
information type: Proprietary → Public
tags: added: nvidia oem-priority originate-from-1887486 sutton
Revision history for this message
Rex Tsai (chihchun) wrote :

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
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