[Bug 73156] New: Dual onboard LCD (eDP1 and DP1) cannot turn on DP1 (no backlight), no backlight control but can see screen in reflected light

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73156

          Priority: medium
            Bug ID: 73156
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Dual onboard LCD (eDP1 and DP1) cannot turn on DP1 (no
                    backlight), no backlight control but can see screen in
                    reflected light
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: daiver at daiver.ru
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 91333
  --> https://bugs.freedesktop.org/attachment.cgi?id=91333&action=edit
intel_reg_dumper, lspci, xrandr, etc

Laptop: Asus Taichi 31 (same problem on Asus Taichi 21)

It has two embedded LCD.
Internal on eDP1 and external on DP1.

Start laptop with lid opened:
- external (DP1) screen backlight off
- internal (eDP1) screen backlight on
- change brighness work on internal
- cannot turn on external
- go to sleep and back, after internal screen backlight work
- lid_open* logs in attach (intel_reg_dumper, lspci, xrandr, etc)

Start laptop with lid closed:
- external (DP1) screen backlight on
- internal (eDP1) screen backlight off
- change brighness work on internal!
- if lid open internal screen turn on, and change backlight work, but no image
on it
- lid_closed_boot* logs in attach

- go to sleep and back, after external screen without backlight
- internal the same: there is backlight but no image
- lid_closed_sleep* logs in attach

test on 3.13-rc6 2013-12-30 same

I can get more info/compile/debug/test with your advice.

-- 
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/20131230/ce5ebc60/attachment.html>