http://bugs.freedesktop.org/show_bug.cgi?id=24611





--- Comment #10 from Pierre Ossman <pierre-bugzi...@ossman.eu>  2009-11-22 
15:29:42 PST ---
More insight. The initial hang goes away if you prevent the driver from
enabling vblank interrupts.

On airlied's request, I checked a couple of registers:

<ossman> 0x3f8 0x02000000 (33554432)
<ossman> 0x3fc 0x00000003 (3)
<ossman> this is what BIOS has left it in, before KMS
<ossman> after KMS:
<ossman> 0x3f8 0x36800000 (914358272)
<ossman> 0x3fc 0x0000000b (11)

One theory is that the code confuses which CRTC is in use. From dmesg:

[drm] crtc 0 is connected to a TV
[drm:drm_vblank_get], enabling vblank on crtc 1, ret: -22


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