** Summary changed:
- Stop trying to use vendor backlight control on laptops
+ Various backlight issues with the 6.0 kernel
** Changed in: linux (Ubuntu Jammy)
Status: In Progress => Invalid
** Changed in: linux (Ubuntu Kinetic)
Status: In Progress => Invalid
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https://bugs.launchpad.net/bugs/2023638
Title:
Various backlight issues with the 6.0 kernel
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-6.0 package in Ubuntu:
Invalid
Status in linux-oem-6.1 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Invalid
Status in linux-oem-6.0 source package in Jammy:
In Progress
Status in linux-oem-6.1 source package in Jammy:
In Progress
Status in linux source package in Kinetic:
Invalid
Status in linux-oem-6.0 source package in Kinetic:
Invalid
Status in linux-oem-6.1 source package in Kinetic:
Invalid
Status in linux source package in Lunar:
In Progress
Status in linux-oem-6.0 source package in Lunar:
Invalid
Status in linux-oem-6.1 source package in Lunar:
Invalid
Status in linux source package in Mantic:
In Progress
Status in linux-oem-6.0 source package in Mantic:
Invalid
Status in linux-oem-6.1 source package in Mantic:
Invalid
Bug description:
[Impact]
There are some new patches for new method to decide which backlight driver
should be registered introduced since 6.1. And we backport some of them to
6.0-oem kernel which are not enough to solved all backlight issues.
1. dell_laptop created a non-working backlight driver before nvidia is
loaded, that leads to the system can't adjust the display brightness.
2. acpi_backlight0 sometimes will be generated together with intel_backlight.
[Fix]
Below 2 commits prevent the acpi_backlight from being registered automatically
e506731c8f35 ACPI: video: Make acpi_backlight=video work independent from GPU
driver
78dfc9d1d1ab ACPI: video: Add auto_detect arg to
__acpi_video_get_backlight_type()
Below patch prevents platform driver(dell_laptop) from creating backlight
driver after win8.
https://patchwork.kernel.org/project/linux-acpi/patch/20230608091258.7963-1-hdego...@redhat.com/
[Test]
Verified on the dell platform which reports this issue.
[Where problems could occur]
The assumption of the not-yet-upstreamed commit regarding backlight control
is that, after Windows 8, all laptop backlights are controlled either by ACPI
or the native graphics driver. It impacts the laptops that do not follow the
assumption and will lead to broken backlight interface.
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