[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 #12 from Filip <tyx027 at gmail.com> ---
(In reply to Imre Deak from comment #11)

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

Yes, rc6 needs to be turned off as well.

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

How can I check this?

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

No, unfortunately that is the thing with these freezes - they are completely
random and cannot be straightforwardly reproduced. A stress test e.g. won't
help. From everything that has been written on the forum, they do however seem
to happen more often when the GPU is doing work.

> 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? 

How do I go about doing this?

> Please also provide a dmesg og 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?

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

These I mostly understand how to do, except the pstore method, but there may be
a guide somewhere. Unfortunately I've had to go back to kernel 4.14 and
disabling rc6 due to working on essays for uni deadlines so I will try all this
as soon as I'm in the clear, but will also ask again that the other Linux users
from the forum contribute here if they can.

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