[Bug 69099] New: [SNB bisected] [Dual Monitor LVDS + VGA] GPU hangs with fullscreen video on VGA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69099

          Priority: medium
            Bug ID: 69099
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [SNB bisected] [Dual Monitor LVDS + VGA] GPU hangs
                    with fullscreen video on VGA
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jens at chaox.net
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 85426
  --> https://bugs.freedesktop.org/attachment.cgi?id=85426&action=edit
dmesg 3.10.7

When attaching a monitor to the VGA port of my Thinkpad X220i and playing a
fullscreen video with VLC (with hardware accel turned on) the GPU hangs and vlc
either freezes or simply shows a black video. This used to work with 3.7, but
starting with commit 7739c33ba48174204b24c1b867b455318e752787 ("drm/i915: add
DP support to intel_ddi_enable_pipe_func") fullscreen video on VGA is broken
for me.

System environment:

distribution: Gentoo Linux
chipset: Sandy Bridge
architecture: 64bit
xf86-video-intel: 2.20.13
xserver: 1.13.4
mesa: 9.1.2
libdrm: 2.4.45
kernel: 3.10.7
machine: Thinkpad X220i 4290-W1A

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