@ddadap: No, nvidia-460 does not fix this regression. I've just tested
nvidia-driver-460 (460.32.03-0ubuntu0.18.04.1) and I observe that it
still misbehaves exactly as described above for 455: The initial
brightness is unusually dim and cannot be changed by any means. (Also,
just like 455,
Not me. I'm using Ubuntu 20.04. Until it's made available by the
software update mechanisms I won't touch it.
But "brightness regressions"? We're talking about basic control. How
does passing regression tests helps this issue? Or did people ignore
regression tests before releasing the 450 series?
Can somebody with an affected system please try with one of the recently
released 460.xx drivers? There were some brightness regressions that
were resolved in the 460 series that may be related.
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Same issue on Lenovo ThinkPat P76. Brightness control was working
before.
$ uname -r
5.4.0-59-generic
$ lspci |grep -i vga
01:00.0 VGA compatible controller: NVIDIA Corporation TU104GLM [Quadro RTX 5000
Mobile / Max-Q] (rev a1)
$ sudo lshw -c video
*-display
** Tags added: oem-priority
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https://bugs.launchpad.net/bugs/1905591
Title:
no brightness control after update from 450 to 455
To manage notifications about this bug go to:
** Also affects: oem-priority
Importance: Undecided
Status: New
** Changed in: oem-priority
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1905591
Title:
** Description changed:
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.
** Changed in: nvidia-graphics-drivers-455 (Ubuntu)
Status: New => Triaged
** Changed in: nvidia-graphics-drivers-455 (Ubuntu)
Importance: Undecided => High
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