https://bugs.freedesktop.org/show_bug.cgi?id=110407
--- Comment #2 from Kai-Heng Feng <[email protected]> ---
(In reply to Ilia Mirkin from comment #1)
> When in non-switchable mode, are there other things in /sys/class/backlight?
> e.g. acpi_video0?
No, nv_backlight (or nvidia_0) is the only interface.
I also tried to call _BCM directly via acpidbg, but both Intel's and Nvidia's
_BCM method changes nothing.
Please refer to the original bug report [1].
>
> Also, presumably this is on v5.0 or later? Prior to that, there was no
> backlight support for Pascal.
Yes, on both v5.0 and linux-next.
[1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1821882
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