This bug was fixed in the package linux - 5.15.0-17.17
---------------
linux (5.15.0-17.17) jammy; urgency=medium
* jammy/linux: 5.15.0-17.17 -proposed tracker (LP: #1957809)
-- Andrea Righi <andrea.ri...@canonical.com> Thu, 13 Jan 2022 17:11:21
+0100
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1953286
Title:
Add support for NVIDIA EC backlight
Status in HWE Next:
New
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem-5.14 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Won't Fix
Status in linux-oem-5.14 source package in Focal:
Fix Released
Bug description:
[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.
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