[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 #13 from paulz <freedesktop.org at nospam.mooo.com> ---
(In reply to Imre Deak from comment #11)
> (In reply to Filip from comment #8)
> > Update: a freeze did unfortunately occur with c-states limited. The other
> > user from the forum also mentioned he tested this before and had the same
> > outcome. 
> 
> Ok, thanks for trying.
disabling c-states do not help


> Ok, as I understood you already tried booting with i915.enable_dc=0 and that
> didn't get rid of the problem.
yes, RC6 have to be disabled


> Could you confirm that all display outputs were off when the freeze happened?
the screens are not off but freezed. After a long time, the screens are black
if i remember correctly


> 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?
switching away to another VT is NOT possible, its the whole PC that freeze!
Even SysRq don't work, keyboard is also dead


> 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 will do that.


> Could you try if booting with nomodeset the freeze still happens?
i will give it a try


> Ok, please still try if the pstore method provides something.
i will give it a try

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