[Bug 69730] New: Intel driver SNA causes x11vnc to display black screen when running xbmc

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69730

          Priority: medium
            Bug ID: 69730
          Assignee: chris at chris-wilson.co.uk
           Summary: Intel driver SNA causes x11vnc to display black screen
                    when running xbmc
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: da_audiophile at yahoo.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

Connecting to a vncserver (x11vnc) running on a machine that uses the intel
drivers with onboard video using SNA acceleration (default these days) causes a
black screen to be displayed on the vncclient but only when xbmc is active. 
Exiting xbmc restores the expected vnc behavior.  Disabling sna in
/etc/X11/xorg.conf.d/20-intel.conf fixes the problem but causes poor video
performance.  Note that I see nothing relevant in my Xorg logs to indicate
there is a problem.

Note that I can connect to other machines that do not use the intel drivers
(nvidia) and I get the expected results.

Linux distro: Arch linux x86_64

Example video hardware: Intel GMA X4500HD

Xorg version: 1.14.3

Drivers packages in use (official ARCH packages):
* intel-dri 9.2.0-2
* libva-intel-driver 1.2.0-1
* xf86-video-intel 2.21.15-1

Command used to start x11vnc on the target box:
/usr/bin/x11vnc -nap -wait 50 -passwd xxx -display :0 -forever -o
/var/log/x11vnc.log -bg

It does not matter if I use the -noxdamage switch; the result is the same.

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