Ubuntu 12.04 dual monitor reset bug

Posted by Tentresh on Ask Ubuntu See other posts from Ask Ubuntu or by Tentresh
Published on 2012-04-27T20:16:14Z Indexed on 2012/09/21 21:57 UTC
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My two displays are:

  • Intel GMA x4500 Laptop (1280x800 native resolution of the built-in display)
  • External display (1920x1080)

Few minutes after I login to my dual monitor setup its get reset to mirror screens. If I restore the settings via displays application everything is fine. On each reset the following messages are written into /var/log/Xorg.0.log:

[    60.852] (II) PM Event received: Capability Changed
[ 60.852] I830PMEvent: Capability change
[ 132.920] (II) intel(0): EDID vendor "SEC", prod id 12869
[ 132.920] (II) intel(0): Printing DDC gathered Modelines:
[ 132.920] (II) intel(0): Modeline "1280x800"x0.0 68.94 1280 1296 1344 1408 800 801 804 816 -hsync -vsync (49.0 kHz)
[ 134.228] (II) intel(0): Allocated new frame buffer 1280x800 stride 5120, tiled

Whereas right on startup or manual resolution reset /var/log/Xorg.0.log reports the expected frame buffer allocation:

[  1562.382] (II) intel(0): EDID vendor "SEC", prod id 12869
[ 1562.382] (II) intel(0): Printing DDC gathered Modelines:
[ 1562.382] (II) intel(0): Modeline "1280x800"x0.0 68.94 1280 1296 1344 1408 800 801 804 816 -hsync -vsync (49.0 kHz)
[ 1576.740] (II) intel(0): Allocated new frame buffer 3200x1080 stride 12800, tiled

Is Ubuntu 12.04 not compatible with my video card? Can this be solved within Ubuntu? I like it's interface, but manually fiddling with resolution on every login is not bearable.

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