radeon error on resume: "cp failed to get scratch reg" - anyone interested?

[Simon Kitching]

Hi,

I've noticed that on resume from suspend, dmesg reports:

[21895.997536] [drm] radeon: 1 quad pipes, 2 z pipes initialized.
[21896.012072] [drm] PCIE GART of 512M enabled (table at 
0x0000000000040000).
[21896.012082] radeon 0000:01:00.0: WB enabled
[21896.012085] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 
0x0000000010000000 and cpu addr 0xffccb000
[21896.012138] [drm] radeon: ring at 0x0000000010001000
[21896.012157] [drm:r100_ring_test] *ERROR* radeon: cp failed to get 
scratch reg (-22).
[21896.012158] [drm:r100_cp_init] *ERROR* radeon: cp isn't working (-22).
[21896.012160] radeon 0000:01:00.0: failed initializing CP (-22).

Graphics still seems to work fine though.

Is this info of interest to anyone? I'm happy to do additional testing 
if that is useful.

System: Radeon Mobility X1600 RV530 (about 5 year old laptop), kernel 
3.6.0-rc5+ 32-bit

Cheers,
Simon