[Bug 71432] [ILK] GPU hung with h.264 video decoding

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71432

--- Comment #18 from Mihail Kasadjikov <hamer.mk at gmail.com> ---
So. I try to test kernel 3.15.10.
I can't use 3.16 because of some issues related to reiserfs.

I found that by default RC6 disabled for IronLake (gen 5).
In file «drivers/gpu/drm/i915/intel_pm.c»:
int intel_enable_rc6(const struct drm_device *dev)
{
…
        /* Disable RC6 on Ironlake */
        if (INTEL_INFO(dev)->gen == 5)
                return 0;
…
}

When I try to force enable_rc6 to 1 it still goes to default (disabled) value:
$ cat /proc/cmdline 
root=/dev/mapper/h13ssd-root ro ipv6.disable=1 elevator=deadline
no_console_suspend=1 pcie_aspm=powersave video=inteldrmfb:1280x800R-8 quiet
intel_iommu=igfx_off resume=/dev/mapper/h13ssd-swap zswap.enabled=1
drm.debug=0x04 i915.enable_rc6=1

$ dmesg | egrep -i "rc6"
[    1.913863] [drm] Enabling RC6 states: RC6 off, RC6p off, RC6pp off

And now I've got one error but without overall system hung.
$ dmesg | egrep -i "hangcheck"
[  350.800043] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed...
bsd ring idle

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