Re: Linux 3.11-rc2

[James Hogan]

On 21 July 2013 20:53, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>  (b) we had a late change to how ACPI backlight handling is done on
> certain machines, and while this kind of thing really shouldn't be
> done outside the merge window, I ended up pulling it anyway. But I'd
> *really* like to have people test this thing particularly on laptops
> with intel-based graphics. It should only matter (and hopefully
> improve things) for the newer ones with BIOSes designed for Windows 8,
> but hey, the more testing, the better. Backlight handling has beenin
> painful before, so I'm mentioning this explicitly.

8c5bd7a "ACPI / video / i915: No ACPI backlight if firmware expects
Windows 8" breaks backlight control for me because
/sys/class/backlight/acpi_video0 disappears, and
/sys/class/backlight/intel_backlight doesn't seem to have any effect.

Note that acpi_video0 only worked because I was applying "[PATCH]
drm/i915: quirk no PCH_PWM_ENABLE for Dell XPS13 backlight" [1], so
strictly speaking mainline already didn't work.

Cheers
James

[1] http://lkml.org/lkml/2013/7/19/748
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