[Bug 105962] [KBL] "enable_rc6" parameter deprecation brings back freezing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105962

--- Comment #29 from paulz <freedesktop.org at nospam.mooo.com> ---
(In reply to Imre Deak from comment #11)
> I'm guessing the DC state toggling is due to GPU activity, probably due to
> updating the clock in your GUI. Could you try preventing these updates (and
> any other GPU activity) for instance by switching away to another VT from
> your GUI and seeing if the freeze still happens? Please also provide a dmesg
> log booting with drm.debug=0x1f up to the freeze to double-check what causes
> the DC state toggling.

i've removed the option to disable i915 rc6 and added instead a udev rule to
lock the GPU frequency and boost (!) frequency to PR1.

ACTION=="add", KERNEL=="card0", SUBSYSTEM=="drm", ATTR{gt_max_freq_mhz}="300",
ATTR{gt_boost_freq_mhz}="300"

Until now no Freeze!! (since yesterday keeping power on)

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