[Bug 71596] New: [Acer Aspire V5-573G] Black screen on boot due to low brightness setting

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71596

          Priority: medium
            Bug ID: 71596
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [Acer Aspire V5-573G] Black screen on boot due to low
                    brightness setting
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: minor
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mario.kleinsasser at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 89178
  --> https://bugs.freedesktop.org/attachment.cgi?id=89178&action=edit
Hardware information

In the last three weeks I've narrowed down the bug described in the
subject through Ubuntu launchpad. My new Laptop (Acer Aspire V5-573G)
with new Haswell CPU shows a black screen on reboot because the
brightness is on zero level. I verified this behaviour with the latest
mainline kernel from
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-trusty/

I have done the bisect process and tracked the bug down to the following
commit.

For explanation:
good commit means: The laptop starts with display brightness on full
power, but low(er) resolution and the Fn+ keys are not working
bad commit means: The laptop starts with black display (0 brightness),
Fn+ keys are working and you can level up the brightness trough the
Fn+ keys. The resolution is the native LCD hardware display resolution

Bisect output:

70b12bb415463c1bd146b67c5fbf6784fd046ad9 is the first bad commit
commit 70b12bb415463c1bd146b67c5fbf6784fd046ad9
Author: Paulo Zanoni <paulo.r.zanoni at intel.com>
Date: Tue Nov 20 13:32:30 2012 -0200

    drm/i915: promote Haswell to full support

    Since it should be working a little bit better now.

    Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

:040000 040000 f93a7761de2157a8be61f20ca9a5499264bb5c55
1fed098470278830f06b0bca1706f61ba231d38d M drivers

For the full bug report and the additional hardware information please
see https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1239183

I've also searched the LKML and maybe this bug could be in conjunction
with http://marc.info/?t=137837786100005&r=1&w=2

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