** Changed in: nvidia-graphics-drivers-455 (Ubuntu)
Status: New => Triaged
** Changed in: nvidia-graphics-drivers-455 (Ubuntu)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1905591
Title:
no brightness control after update from 450 to 455
Status in nvidia-graphics-drivers-455 package in Ubuntu:
Triaged
Bug description:
On my Lenovo X1 Extreme with GPU: NVIDIA Corporation GP107M [GeForce
GTX 1050 Ti Mobile]
Updating to nvidia-driver-455 results in loss of brightness control.
On boot, the laptop display brightness is somewhat less than fully
bright and cannot be changed. The brightness up/down keys do pop up
the gnome gui brightness widget, and /sys/class/backlight/nvidia_0/*
values do change, but the actual display's brightness does not.
Problem occurs with either version of nvidia-driver-455 (the archive
or the ~graphics-drivers/PPA). Normal functionality returns if I
downgrade to any version of nvidia-driver-450.
Note also that manually applying this to
/lib/systemd/system/nvidia-persistenced.service has no effect on the problem:
https://github.com/hugh712/nvidia-graphics-drivers/commit/bccad5ee6444dd8c5c47ba19ea0232106a1086f5
Distributor ID: Ubuntu
Description: Ubuntu 18.04.5 LTS
Release: 18.04
Codename: bionic
kernel: 5.4.0-54-generic #60~18.04.1-Ubuntu SMP Fri Nov 6 17:25:16 UTC
2020 x86_64 x86_64 x86_64 GNU/Linux
nvidia-driver-455: 455.38-0ubuntu0.18.04.1
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