Nothing changed after removing parameter.
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to nvidia-graphics-drivers-460 in Ubuntu.
https://bugs.launchpad.net/bugs/1905591
Title:
no brightness control in {455,460} after update from 450
Status in OEM Priority Project:
New
Status in nvidia-graphics-drivers-455 package in Ubuntu:
Confirmed
Status in nvidia-graphics-drivers-460 package in Ubuntu:
Confirmed
Bug description:
On my Lenovo X1 Extreme with GPU: NVIDIA Corporation GP107M [GeForce
GTX 1050 Ti Mobile]:
WORKS FINE:
nvidia-driver-450: 450.102.04-0ubuntu0.18.04.1
NO BRIGHTNESS CONTROL:
nvidia-driver-455: 455.38-0ubuntu0.18.04.1
nvidia-driver-460: 460.32.03-0ubuntu0.18.04.1
nvidia-driver-460: 460.39-0ubuntu0.18.04.1
*WORKAROUND: See comment #11 (add nvidia drivers to initramfs).
*Note that 460 fixes it for a 20.04 ThinkPad P73 per comment #6, but
not for my 18.04.5 Lenovo ThinkPad X1 per comment #5.
Updating to nvidia-driver-455 (or -460) 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) or any version of -460.
Normal functionality returns if I downgrade to any version of nvidia-
driver-450.
Also observed: 455 and 460 temporarily display some pixel garbage
while mode-switching during the graphic login sequence. Only a minor
glitch, but note that 450 does not exhibit that issue either.
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
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