[Bug 91973] New: Loosing external monitor output

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91973

            Bug ID: 91973
           Summary: Loosing external monitor output
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: legrain at crans.org
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 118206
  --> https://bugs.freedesktop.org/attachment.cgi?id=118206&action=edit
dmesg before and after / modInfo output

Hi !
I have video problems with my broadwell video output. With some external
projectors (plugged through mini-displayport to VGA adaptor) I have issues with
flickering and loosing external projector.

Steps to reproduce :
1/ Plug the external monitor
2/ Put some window on it
3/ Work between 5 and 1 minute
4/ Projector goes black, output seems to be lost
5/ Projector and laptop screen blink
6/ Sometimes projector never goes back, sometimes it reappears again for a
while
7/ Repeat 4/

I tried with kernel 4.2 : same issue
I tried with sna rather than uxa : same issue
I tried enable_ips=0, enable_fbc=0, enable_rc6=1 : same issue

The odd thing is that it seems to depend on the connected projector.

Machine : Dell XPS 13 2015
Distribution : Arch linux
Connector : Dell mini-displayport to VGA adapter
CPU : Intel(R) Core(TM) i5-5300U CPU @ 2.30GHz
Kernel : 4.1.6-1-ARCH #1 SMP PREEMPT Mon Aug 17 08:52:28 CEST 2015 x86_64
GNU/Linux
xf86-video-intel: 2.99.917.463.gd50d336-1  (from git)
or even with 2.99.917+381+g5772556-1 (from arch repository)

-- 
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/20150911/f6c61ac3/attachment.html>