Hi,
On 10/24/22 13:56, Akihiko Odaki wrote:
> On 2022/10/24 20:48, Jani Nikula wrote:
>> On Mon, 24 Oct 2022, Akihiko Odaki <akihiko.odaki@xxxxxxxxxx> wrote:
>>> Commit 2600bfa3df99 ("ACPI: video: Add acpi_video_backlight_use_native()
>>> helper") and following commits made native backlight unavailable if
>>> CONFIG_ACPI_VIDEO is set and the backlight feature of ACPI video is
>>> unavailable, which broke the backlight functionality on Lenovo ThinkPad
>>> C13 Yoga Chromebook. Allow to fall back to native backlight in such
>>> cases.
>>
>> Where's the bug report with relevant logs, kconfigs, etc?
>
> I haven't filed one. Should I? Please tell me where to report and what information you would need (to bugzilla.kernel.org with things mentioned in Documentation/admin-guide/reporting-issues.rst?)
As mentioned in my other email this is a known issue, and your effort
to fix this is appreciated very much, but I don't believe your solution
to be the right one.
See: https://lore.kernel.org/linux-acpi/42a5f2c9-a1dc-8fc0-7334-fe6c390ecfbb@xxxxxxxxxx/
for more details and possible solutions. Please try implementing one of
those solutions for your Chromebook. I unfortunately do not have hw to
test this myself.
Regards,
Hans
>
> Regards,
> Akihiko Odaki
>
>>
>> BR,
>> Jani.
>>
>>>
>>> Signed-off-by: Akihiko Odaki <akihiko.odaki@xxxxxxxxxx>
>>>
>>> Akihiko Odaki (22):
>>> drm/i915/opregion: Improve backlight request condition
>>> ACPI: video: Introduce acpi_video_get_backlight_types()
>>> LoongArch: Use acpi_video_get_backlight_types()
>>> platform/x86: acer-wmi: Use acpi_video_get_backlight_types()
>>> platform/x86: asus-laptop: Use acpi_video_get_backlight_types()
>>> platform/x86: asus-wmi: Use acpi_video_get_backlight_types()
>>> platform/x86: compal-laptop: Use acpi_video_get_backlight_types()
>>> platform/x86: eeepc-laptop: Use acpi_video_get_backlight_types()
>>> platform/x86: fujitsu-laptop: Use acpi_video_get_backlight_types()
>>> platform/x86: ideapad-laptop: Use acpi_video_get_backlight_types()
>>> platform/x86: msi-laptop: Use acpi_video_get_backlight_types()
>>> platform/x86: msi-wmi: Use acpi_video_get_backlight_types()
>>> platform/x86: nvidia-wmi-ec-backlight: Use
>>> acpi_video_get_backlight_types()
>>> platform/x86: panasonic-laptop: Use acpi_video_get_backlight_types()
>>> platform/x86: samsung-laptop: Use acpi_video_get_backlight_types()
>>> platform/x86: sony-laptop: Use acpi_video_get_backlight_types()
>>> platform/x86: thinkpad_acpi: Use acpi_video_get_backlight_types()
>>> platform/x86: toshiba_acpi: Use acpi_video_get_backlight_types()
>>> platform/x86: dell-laptop: Use acpi_video_get_backlight_types()
>>> platform/x86: intel_oaktrail: Use acpi_video_get_backlight_types()
>>> ACPI: video: Remove acpi_video_get_backlight_type()
>>> ACPI: video: Fallback to native backlight
>>>
>>> Documentation/gpu/todo.rst | 8 +--
>>> drivers/acpi/acpi_video.c | 2 +-
>>> drivers/acpi/video_detect.c | 54 ++++++++++---------
>>> drivers/gpu/drm/i915/display/intel_opregion.c | 3 +-
>>> drivers/platform/loongarch/loongson-laptop.c | 4 +-
>>> drivers/platform/x86/acer-wmi.c | 2 +-
>>> drivers/platform/x86/asus-laptop.c | 2 +-
>>> drivers/platform/x86/asus-wmi.c | 4 +-
>>> drivers/platform/x86/compal-laptop.c | 2 +-
>>> drivers/platform/x86/dell/dell-laptop.c | 2 +-
>>> drivers/platform/x86/eeepc-laptop.c | 2 +-
>>> drivers/platform/x86/fujitsu-laptop.c | 4 +-
>>> drivers/platform/x86/ideapad-laptop.c | 2 +-
>>> drivers/platform/x86/intel/oaktrail.c | 2 +-
>>> drivers/platform/x86/msi-laptop.c | 2 +-
>>> drivers/platform/x86/msi-wmi.c | 2 +-
>>> .../platform/x86/nvidia-wmi-ec-backlight.c | 2 +-
>>> drivers/platform/x86/panasonic-laptop.c | 2 +-
>>> drivers/platform/x86/samsung-laptop.c | 2 +-
>>> drivers/platform/x86/sony-laptop.c | 2 +-
>>> drivers/platform/x86/thinkpad_acpi.c | 4 +-
>>> drivers/platform/x86/toshiba_acpi.c | 2 +-
>>> drivers/video/backlight/backlight.c | 18 +++++++
>>> include/acpi/video.h | 21 ++++----
>>> include/linux/backlight.h | 1 +
>>> 25 files changed, 85 insertions(+), 66 deletions(-)
>>
>
