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
description: VGA compatible controller
product: TU104GLM [Quadro RTX 5000 Mobile / Max-Q]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:01:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
configuration: driver=nvidia latency=0
resources: irq:197 memory:ed000000-edffffff memory:c0000000-cfffffff
memory:d0000000-d1ffffff ioport:2000(size=128) memory:ee080000-ee0fffff
Downgrade to 450 works for me too.
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https://bugs.launchpad.net/bugs/1905591
Title:
no brightness control after update from 450 to 455
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