[Bug 73848] New: [Radeon] Blank screen after boot with kernel 3.12.x, xorg 1.15

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73848

          Priority: medium
            Bug ID: 73848
          Assignee: dri-devel at lists.freedesktop.org
           Summary: [Radeon] Blank screen after boot with kernel 3.12.x,
                    xorg 1.15
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: marti at juffo.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Radeon
           Product: DRI

With ASUS Radeon R9 270, just after I boot up and GDM is supposed to start, my
screen goes blank and some GPU faults are reported in dmesg.

Upgrading to kernel 3.13 solves this issue.

One time the graphics also recovered with 3.12.8 after coming back from
suspend, but I have not been able to reproduce that.

Using up-to-date Arch Linux testing with:
xorg-server 1.15.0
mesa 10.0.2
libdrm 2.4.51
xf86-video-ati 7.2.0
kernel versions tested: 3.12.8, 3.12.1, 3.11.5, 3.10.10

The following errors are reported in dmesg (full log attached):
radeon 0000:01:00.0: GPU fault detected: 147 0x005e7001
radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x091C0002
radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x1E070001
VM fault (0x01, vmid 15) at page 152829954, read from CP (112)
radeon 0000:01:00.0: GPU fault detected: 147 0x02de8801
radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00000000
radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x00000000
VM fault (0x00, vmid 0) at page 0, read from unknown (0)
radeon 0000:01:00.0: GPU fault detected: 147 0x02de8801
radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00000000
radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x00000000
VM fault (0x00, vmid 0) at page 0, read from unknown (0)
radeon 0000:01:00.0: GPU fault detected: 147 0x04df8402
radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00080826
radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x1F084002
VM fault (0x02, vmid 15) at page 526374, write from TC (132)

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