I'm seeing something similar on a 945GM; I think they are the top edge of 
windows - I've seen some of the lines seem to have the same colouring as a line 
of a title bar.
It only seems to happen for me if I enable both the external display and the 
internal LCD at the same time.
(Toshiba Equium A200 with 1280x800 internal; external is a Dell S2409W running 
1920x1080). There are a few EE lines in the Xorg.0.log:


(EE) intel(0): Cannot support DRI with frame buffer width > 2048.
(EE) intel(0): Non-contiguous GTT entries: (6295552,0x16bffbe000) vs 
(131072,0xbf820000)
(EE) intel(0): underrun on pipe B!
(EE) intel(0): underrun on pipe B!
(EE) USBPS2: Read error: No such device
(EE) USBPS2: Read error: No such device

I don't know if they are related.

Dave

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Horizontal lines on Intel G45 (aka x4500hd) output
https://bugs.launchpad.net/bugs/258925
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