Re: [PATCH] ACPI: video: Force backlight native for more TongFang devices

[Greg KH <gregkh@linuxfoundation.org>]

On Wed, Oct 19, 2022 at 04:01:42PM +0200, Werner Sembach wrote:
> commit 3dbc80a3e4c55c4a5b89ef207bed7b7de36157b4 upstream.

That is not this commit at all :(

> The upstream commit "ACPI: video: Make backlight class device registration
> a separate step (v2)" changes the logic in a way that these quirks are not
> required anymore, but kernel <= 6.0 still need these.
> 
> The TongFang GKxNRxx, GMxNGxx, GMxZGxx, and GMxRGxx / TUXEDO
> Stellaris/Polaris Gen 1-4, have the same problem as the Clevo NL5xRU and
> NL5xNU / TUXEDO Aura 15 Gen1 and Gen2:
> They have a working native and video interface for screen backlight.
> However the default detection mechanism first registers the video interface
> before unregistering it again and switching to the native interface during
> boot. This results in a dangling SBIOS request for backlight change for
> some reason, causing the backlight to switch to ~2% once per boot on the
> first power cord connect or disconnect event. Setting the native interface
> explicitly circumvents this buggy behaviour by avoiding the unregistering
> process.
> 
> Signed-off-by: Werner Sembach <wse@tuxedocomputers.com>
> ---
>  drivers/acpi/video_detect.c | 64 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 64 insertions(+)
> 


<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>