[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 #11 from Imre Deak <imre.deak at intel.com> ---
(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.

> Journalctl doesn't show anything out of the ordinary. i915 was just
> switching DC states from 00 to 02 and vice versa, the last one it switched
> to being 00. What may be interesting is that i915 had been quiet for 14
> seconds prior to the freeze, while it usually does something every two
> seconds. This also happened before in the session, however, and with no
> freeze.

Ok, as I understood you already tried booting with i915.enable_dc=0 and that
didn't get rid of the problem.

Could you confirm that all display outputs were off when the freeze happened?

Do you see any other pattern in what you do before the freeze?

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.

Could you try if booting with nomodeset the freeze still happens?

> Due to some obstacles, I had not gotten to setting up something to
> obtain a log while the machine is frozen, but I will see what I can do.
> 
> The other user's comment on logging, however, is: "You will don't find any
> logs related that freeze. Even not with kernels netconsole or any debugging
> parameters.  I've spend many time to that issue and find nothing"

Ok, please still try if the pstore method provides something.

Thanks.

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