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[Igor Korobka <igokoro@xxxxxxxxx>]

As taiebot65 said I can reproduce this bug on my Intel graphic card with
CD from the weekly ppa. I'm using Lucid (upgraded from Karmic).

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[i945gm] Opengl is unstable with cairo-dock drmWaitVBlank returned -1
https://bugs.launchpad.net/bugs/428900
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Status in Cairo-Dock : Core: Confirmed
Status in “mesa” package in Ubuntu: Incomplete
Status in “xserver-xorg-video-intel” package in Ubuntu: Invalid

Bug description:
Binary package hint: xserver-xorg-video-intel

I have been testing cairo-dock for quite a while now and the opengl as always been unstable for me.
 When i was testing Jaunty, in alpha 6 i managed to get a full working dock in opengl mode for 2 days since then it never worked fully again.
I am back in Karmic to test the drivers and hopefully fix this unstable opengl.

I am using xorg edgers and i have noticed a great amelioration but OPengl version failed because after some use the background turn to white.

I think it s related to this debug 

 do_wait: drmWaitVBlank returned -1, IRQs don't seem to be working correctly.

I am attaching a video of the problem..

[lspci]
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 03)
    	Subsystem: Gateway 2000 Device [107b:0366]