On Fri, 2012-09-14 at 14:09 +0100, Grant Likely wrote: > On Fri, Sep 14, 2012 at 2:01 PM, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote: > > On Fri, 14 Sep 2012 13:57:06 +0100, Grant Likely <grant.likely@xxxxxxxxxxxx> wrote: > >> Some platforms (for instance MacbookPros) have custom backlight drivers > >> and don't use the integrated i915 backlight control. This patch adds a > >> quirk to disable registering the intel backlight when unused on a > >> platform. > >> > >> Tested on MacbookPro8,3. Without this patch both the intel_backlight and > >> gmux_backlight devices get registered and userspace doesn't know which > >> it should use. > > > > Userspace is informed throught the backlight/type property. > > Perhaps, but userspace (Ubuntu) isn't doing anything with it, and it > still remains that it makes no sense whatsoever to register a > backlight device that doesn't exist. Indeed. Userspace (well, gnome-settings-daemon) will use the backlight provided by X, in preference to anything it finds in /sys/class/backlight. So if the Intel one is present (and thus exposed via X) then userspace will never bother with comparing types and choosing the sanest backlight to use. See https://bugzilla.redhat.com/show_bug.cgi?id=752595 -- dwmw2
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