Comment # 55 on bug 75992 from nicolas.laplante@gmail.com

Regression on 3.14.3. Screen corruption is back. Using Radeon microcode from
2014-04-30.

dmesg is full of messages like this:

[  658.696174] radeon 0000:01:00.0: GPU fault detected: 147 0x0ee20808
[  658.696175] radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR  
0x00000000
[  658.696177] radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS
0x00000000
[  658.696178] VM fault (0x00, vmid 0) at page 0, read from '' (0x00000000) (0)