[Bug 68301] New: [bisected] Headless OpenCL broken

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https://bugzilla.kernel.org/show_bug.cgi?id=68301

            Bug ID: 68301
           Summary: [bisected] Headless OpenCL broken
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.13
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: niels_ole@salscheider-online.de
        Regression: No

Created attachment 121331
  --> https://bugzilla.kernel.org/attachment.cgi?id=121331&action=edit
dmesg output

Since 10ebc0bc09344ab6310309169efc73dfe6c23d72, headless OpenCL is broken on my
university's Radeon S7000 unless I pass "radeon.runpm=0".

The first OpenCL program after a reboot seems to work, but all after that
output an error similar to the following:

radeon: Failed to allocate virtual address for buffer:
radeon:    size      : 4352 bytes
radeon:    alignment : 4096 bytes
radeon:    domains   : 4
radeon:    va        : 0x0000000000800000
radeon: Failed to allocate virtual address for buffer:
radeon:    size      : 4352 bytes
radeon:    alignment : 4096 bytes
radeon:    domains   : 4
radeon:    va        : 0x0000000000800000

In dmesg, I can see that some parts of the initialization routine are repeated:
[  348.906146] [drm] probing gen 2 caps for device 8086:151 = 261ad03/e
[  348.906151] [drm] PCIE gen 3 link speeds already enabled
[  348.909465] [drm] PCIE GART of 1024M enabled (table at 0x0000000000478000).
[...]

After that, the GPU keeps locking up.

I have attached the dmesg output.

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