https://bugs.freedesktop.org/show_bug.cgi?id=75992

--- Comment #57 from nicolas.laplante@gmail.com ---
Ok, tried 3.15_rc5 and I get no corruption. But, booting took a long time
(calibrating clocksource TSC) and I got this message:

radeon 0000:01:00.0: Direct firmware load failed with error -2

Here's the dmesg | grep drm:

[    0.703606] [drm] Initialized drm 1.1.0 20060810
[    0.703728] [drm] radeon kernel modesetting enabled.
[    0.704231] [drm] initializing kernel modesetting (BONAIRE 0x1002:0x6658
0x174B:0xE253).
[    0.704390] [drm] register mmio base: 0xFE9C0000
[    0.704477] [drm] register mmio size: 262144
[    0.704565] [drm] doorbell mmio base: 0xCF800000
[    0.704649] [drm] doorbell mmio size: 8388608
[    0.707062] [drm] Detected VRAM RAM=2048M, BAR=256M
[    0.707148] [drm] RAM width 128bits DDR
[    0.707658] [drm] radeon: 2048M of VRAM memory ready
[    0.707744] [drm] radeon: 1024M of GTT memory ready.
[    0.707846] [drm] Loading BONAIRE Microcode
[   60.691462] [drm] radeon/BONAIRE_mc.bin: 31464 bytes
[   60.691551] [drm] Internal thermal controller with fan control
[   60.691679] [drm] probing gen 2 caps for device 1002:5978 = 300d02/0
[   60.699424] [drm] radeon: dpm initialized
[  120.799122] [drm] GART: num cpu pages 262144, num gpu pages 262144
[  120.801322] [drm] probing gen 2 caps for device 1002:5978 = 300d02/0
[  120.801413] [drm] PCIE gen 2 link speeds already enabled
[  120.810251] [drm] PCIE GART of 1024M enabled (table at 0x0000000000277000).
[  120.811879] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[  120.811968] [drm] Driver supports precise vblank timestamp query.
[  120.812206] [drm] radeon: irq initialized.
[  120.814520] [drm] ring test on 0 succeeded in 3 usecs
[  120.814689] [drm] ring test on 1 succeeded in 3 usecs
[  120.814790] [drm] ring test on 2 succeeded in 3 usecs
[  120.815030] [drm] ring test on 3 succeeded in 2 usecs
[  120.815127] [drm] ring test on 4 succeeded in 2 usecs
[  120.871242] [drm] ring test on 5 succeeded in 2 usecs
[  120.891334] [drm] UVD initialized successfully.
[  120.891718] [drm] ib test on ring 0 succeeded in 0 usecs
[  120.891961] [drm] ib test on ring 1 succeeded in 0 usecs
[  120.892205] [drm] ib test on ring 2 succeeded in 0 usecs
[  120.892467] [drm] ib test on ring 3 succeeded in 0 usecs
[  120.892719] [drm] ib test on ring 4 succeeded in 0 usecs
[  120.913684] [drm] ib test on ring 5 succeeded
[  120.934151] [drm] Radeon Display Connectors
[  120.934232] [drm] Connector 0:
[  120.934318] [drm]   DP-1
[  120.934402] [drm]   HPD2
[  120.934488] [drm]   DDC: 0x6530 0x6530 0x6534 0x6534 0x6538 0x6538 0x653c
0x653c
[  120.934615] [drm]   Encoders:
[  120.934700] [drm]     DFP1: INTERNAL_UNIPHY2
[  120.934786] [drm] Connector 1:
[  120.934864] [drm]   HDMI-A-1
[  120.934948] [drm]   HPD3
[  120.935033] [drm]   DDC: 0x6550 0x6550 0x6554 0x6554 0x6558 0x6558 0x655c
0x655c
[  120.935152] [drm]   Encoders:
[  120.935230] [drm]     DFP2: INTERNAL_UNIPHY2
[  120.935315] [drm] Connector 2:
[  120.935394] [drm]   DVI-D-1
[  120.935479] [drm]   HPD1
[  120.935563] [drm]   DDC: 0x6560 0x6560 0x6564 0x6564 0x6568 0x6568 0x656c
0x656c
[  120.935684] [drm]   Encoders:
[  120.935763] [drm]     DFP3: INTERNAL_UNIPHY1
[  120.935850] [drm] Connector 3:
[  120.935928] [drm]   DVI-I-1
[  120.936006] [drm]   HPD6
[  120.936085] [drm]   DDC: 0x6580 0x6580 0x6584 0x6584 0x6588 0x6588 0x658c
0x658c
[  120.936211] [drm]   Encoders:
[  120.936295] [drm]     DFP4: INTERNAL_UNIPHY
[  120.936381] [drm]     CRT1: INTERNAL_KLDSCP_DAC1
[  120.990787] [drm] fb mappable at 0xD047A000
[  120.990873] [drm] vram apper at 0xD0000000
[  120.990952] [drm] size 7299072
[  120.991037] [drm] fb depth is 24
[  120.991116] [drm]    pitch is 6912
[  120.991261] fbcon: radeondrmfb (fb0) is primary device
[  121.025398] radeon 0000:01:00.0: fb0: radeondrmfb frame buffer device
[  121.026375] [drm] Initialized radeon 2.38.0 20080528 for 0000:01:00.0 on
minor

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