https://bugzilla.novell.com/show_bug.cgi?id=693232
https://bugzilla.novell.com/show_bug.cgi?id=693232#c9
--- Comment #9 from Joey Lee 2012-10-05 04:21:08 UTC ---
OK, finally upstream choice to remove the i915 backlight interface when PWM is
zero:
http://cgit.freedesktop.org/~danvet/drm-intel/commit/?id=28dcc2d60cb570d9f54...
author Jani Nikula
drm/i915: do not expose a dysfunctional backlight interface to userspace
Previously intel_panel_setup_backlight() would create a sysfs backlight
interface with max brightness of 1 if it was unable to figure out the max
backlight brightness. This rendered the backlight interface useless.
Do not create a dysfunctional backlight interface to begin with.
This patch didn't merge in v3.6, but I think will show up in v3.7 kernel. For
openSUSE, this patch will in 12.3. I will backport this patch for 12.2.
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