[Bug 79071] New: Hang with dpm radeon hd 5750, pcie 1.1 motherboard

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=79071

            Bug ID: 79071
           Summary: Hang with dpm radeon hd 5750, pcie 1.1 motherboard
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.16-rc2 (all dpm kernels)
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: jonathan@unbiased.name
        Regression: No

Created attachment 141161
  --> https://bugzilla.kernel.org/attachment.cgi?id=141161&action=edit
dmesg

New bug report but problem been around since start of dpm code. Only now tried
out few more tests. I think (without certainty) underlying cause is the old
motherboard. (Have no other system to swap to.)

System runs stable until running games. Found cogs a good test case as it
usually hangs quickly on the menu. 

/sys/class/drm/card0/device/power_dpm_force_performance_level
No problems when low.
Set to high (ie not dynamic) still hangs in games.

Tried (modified for cypress_dpm.c)
https://bugs.freedesktop.org/attachment.cgi?id=86424
no fix.

Setting
eg_pi->vddci_control = false;
Working so far.


Any refined patch to test much appreciated.

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