Public bug reported:
[Impact]
Some system equipped with NVIDIA GFX cannot change screen brightness.
[Fix]
Add new way to change brightness.
[Test]
After the fix is applied, there's a new backlight sysfs
"nvidia_wmi_ec_backlight" can change the screen brightness.
[Where problems could occur]
The driver relies on BIOS to behave correctly. If the BIOS lies or has a
bug, the new backlight interface will overtake other backlight
interfaces. It's rather unlikely though.
** Affects: linux (Ubuntu)
Importance: Low
Status: Confirmed
** Affects: linux-oem-5.14 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Focal)
Importance: Undecided
Status: Won't Fix
** Affects: linux-oem-5.14 (Ubuntu Focal)
Importance: Low
Status: Confirmed
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https://bugs.launchpad.net/bugs/1953286
Title:
Add support for NVIDIA EC backlight
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