[Bug 87286] [i915 intel_backlight] can't regulate brightness at GDM login prompt if HDMI monitor connected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87286

--- Comment #23 from Aaron Lu <aaron.lu at intel.com> ---
(In reply to jre.winesim from comment #22)
> (In reply to Aaron Lu from comment #20)
> > If the backlight indeed works, then we have mistakenly disabled the native
> > interface and I think we should revert that patch.
> 
> Based on Linus "We do not break userspace" I disagree. Everything works fine
> here with an older kernel <3.16. And it works again for every newer kernel I
> tested if I disable intel_backlight. So there was a regression in the kernel
> which had to be fixed.

I still don't understand what the problem is: if setting a brightness value
requires root privilege, then it is true for both acpi_video and
intel_backlight and if intel_backlight always works(i.e. by doing echo), I
don't see why the broken user space tool works with acpi_video but not with
intel_backlight...

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are on the CC list for the bug.
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20150228/9470253b/attachment.html>