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I have an Dell XPS 13 Ultrabook with Ubuntu 12.04. its works pretty well, but if I attach my Apple Cinema Display with the Mini Display Port then hangs the Notebook up.

Its totally randomly. Power attached or not, freshly restarted or not, monday or friday. I cant see any pattern for the problem.

The X Log says nothing. Only the last line looks very suspicious:

[    35.539] (II) intel(0): Printing DDC gathered Modelines:
[    35.539] (II) intel(0): Modeline "1366x768"x0.0   71.01  1366 1414 1446 1498  768  769 773 790 +hsync -vsync (47.4 kHz)
[    35.539] (II) intel(0): Modeline "1366x768"x0.0   47.34  1366 1414 1446 1498  768 769 773 790 +hsync -vsync (31.6 kHz)
[    85.997] (II) intel(0): EDID vendor "CMN", prod id 4920
[    85.998] (II) intel(0): Printing DDC gathered Modelines:
[    85.998] (II) intel(0): Modeline "1366x768"x0.0   71.01  1366 1414 1446 1498  768 769 773 790 +hsync -vsync (47.4 kHz)
[    85.998] (II) intel(0): Modeline "1366x768"x0.0   47.34  1366 1414 1446 1498  768 769 773 790 +hsync -vsync (31.6 kHz)
[    86.469] (II) intel(0): Allocated new frame buffer 1920x1968 stride 7680, tiled
[    86.592] BUG: triggered 'if (!dev->valuator || dev->valuator->numAxes < 2)'
BUG: ../../dix/getevents.c:850 in scale_to_desktop()
[    86.592] 
Backtrace:
[    86.593] 0: /usr/bin/X (xorg_backtrace+0x26) [0x7f3f3e231866]
[    86.593] 1: /usr/bin/X (0x7f3f3e0a9000+0x621fe) [0x7f3f3e10b1fe]
[    86.594] 2: /u%
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Have you installed the drivers for your graphics card? – nikhil Jun 7 '12 at 9:59
It runs out of the Box. No Drive needed. Do you have any Suggestion? – Dennis Wisnia Jun 7 '12 at 11:40
I don't know of your graphics hardware, if you have nvidia or ati, it's better to install those drivers. The generic drivers struggle with hardware acceleration and multiple monitors. I have a nvidia chip and I use nvidia-settings to configure my multiple monitors when required. – nikhil Jun 7 '12 at 17:50

1 Answer

up vote 2 down vote

The “xorg-server” version 2:1.11.4-0ubuntu10.4 should fix it, but the new version 2:1.11.4-0ubuntu10.6 don't have this fix. https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/921236

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thanks for the info! I still wait for the patch! – Dennis Wisnia Aug 1 '12 at 13:24

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