Since yesterday I've been testing last drm-fixes-3.19 kernel with old radeon
firmwares. I mean before big upgrade on 24th of July.

I've played Dota2 and watched videos on flash and on mpv with vdpau, and I
can't reproduce those warnings anymore.

But while I play I can see these:

[10319.747657] radeon 0000:07:00.0: GPU fault detected: 146 0x0b080404
[10319.747665] radeon 0000:07:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR  
0x00017258
[10319.747670] radeon 0000:07:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS
0x08004004
[10319.747675] VM fault (0x04, vmid 4) at page 94808, read from TC (4)
[12134.226711] radeon 0000:07:00.0: GPU fault detected: 146 0x0b084404
[12134.226719] radeon 0000:07:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR  
0x00017258
[12134.226724] radeon 0000:07:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS
0x08044004
[12134.226728] VM fault (0x04, vmid 4) at page 94808, read from TC (68)