https://bugzilla.kernel.org/show_bug.cgi?id=16140





--- Comment #21 from Florian Mickler <flor...@mickler.org>  2010-10-07 22:31:27 
---
Created an attachment (id=32762)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=32762)
debug patch to see where we fail to set up the ring

You have this in you kern.log file:
[drm] radeon: ring at 0x00000000D0000000

which doesnt't look so good. 
>From there on it goes bad:

Sep 17 13:12:12 tbox kernel: [  381.304184] [drm:r100_ring_test] *ERROR*
radeon: ring test failed (sracth(0x15E4)=0xCAFEDEAD)
Sep 17 13:12:12 tbox kernel: [  381.304187] [drm:r100_cp_init] *ERROR* radeon:
cp isn't working (-22).
Sep 17 13:12:12 tbox kernel: [  381.304191] radeon 0000:01:00.0: failled
initializing CP (-22).

which explains the 
"[drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(0)." message. 

cp.ready is false, due to r100_cp_init failing.

Let's see if we can narrow down what fails. Can you apply this patch and post
the resulting kern.log?

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