[Intel-gfx] [RFC PATCH 0/2] i915 brightness control

[Pedro Ribeiro]

On 2 June 2010 23:11, Kamal Mostafa <kamal at canonical.com> wrote:
> Requesting comments on this idea (proposed by Matthew Garrett) and my
> implementation.  Note especially the KNOWN PROBLEM with a "GM45" GPU.
>
>  -Kamal
>
> .......
>
> BugLink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/568611
>
> In order to avoid the often-dysfunctional native acpi brightness control
> methods, a new acpi_brightness_hook interface is made available.
>
> The i915 driver uses the new hook to take over brightness control.
> Boot with i915.brightness=0 to disable.
>
> KNOWN PROBLEM:
>  - i915 opregion brightness control silently fails on GM45 (pci-id 0x2a42)
>
> [RFC PATCH 1/2] acpi/video: acpi_brightness_hook API
> [RFC PATCH 2/2] drm/i915: override acpi brightness control
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
>

Are you sure this is a good idea to enable it by default just because
of a problem with one manufacturer (Dell)?

My Lenovo laptop has fine brightness control with a GM45 and this may break it.
Might be safer only to enable it for laptops with known problems.


Regards,
Pedro