This bug was fixed in the package linux-oem-5.14 - 5.14.0-1011.11
---------------
linux-oem-5.14 (5.14.0-1011.11) focal; urgency=medium
* focal/linux-oem-5.14: 5.14.0-1011.11 -proposed tracker
(LP: #1954691)
* Packaging resync (LP: #1786013)
- debian/dkms-versions -- update from kernel-versions (main/2021.11.08)
* s2idle suspend failure: amd_pmc AMDI0005:00: SMU response timed out
(LP: #1954633)
- platform/x86: amd-pmc: Fix s2idle failures on certain AMD laptops
* Fix power button wakeup with shared IRQs on AMD platforms (LP: #1953540)
- ACPI: Add stubs for wakeup handler functions
- pinctrl: amd: Fix wakeups when IRQ is shared with SCI
* alsa/hda: the microphone can't be detected on a couple of lenovo machines
(LP: #1954612)
- ALSA: hda/realtek - Add headset Mic support for Lenovo ALC897 platform
* mt7921e: Failed to start WM firmware (LP: #1954300)
- SAUCE: Bluetooth: btusb: Handle download_firmware failure cases
- SAUCE: Bluetooth: btusb: Return error code when getting patch status
failed
* Fix cpufreq: cpufreq_online: Failed to initialize policy for cpu: 0 (-19)
(LP: #1954617)
- ACPI: CPPC: Introduce cppc_get_nominal_perf()
- ACPI: CPPC: Add NULL pointer check to cppc_get_perf()
- cpufreq: intel_pstate: hybrid: Rework HWP calibration
* Add support for NVIDIA EC backlight (LP: #1953286)
- platform/x86: Add driver for ACPI WMAA EC-based backlight control
- platform/x86: Remove "WMAA" from identifier names in wmaa-backlight-wmi.c
- platform/x86: Rename wmaa-backlight-wmi to nvidia-wmi-ec-backlight
- [Config] NVIDIA_WMI_EC_BACKLIGHT=m
* Let VMD follow host bridge PCIe settings (LP: #1954611)
- SAUCE: PCI: vmd: Honor ACPI _OSC on PCIe features
-- Timo Aaltonen <[email protected]> Mon, 13 Dec 2021
19:41:56 +0200
** Changed in: linux-oem-5.14 (Ubuntu Focal)
Status: Fix Committed => 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:
Confirmed
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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