[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 #20 from Arthur <aeigenbrot at gmail.com> ---
Hi all, at the risk flooding this thread with "me too"'s I'd like to add some
information that might be useful. Some background: I have a X1 Carbon 5th Gen
with an i5-7200U and Intel Graphics 620 and am experiencing a very similar
problem as Filip. The only difference is that my computer does not freeze, it
simply shuts down suddenly and violently as if someone disconnected the
battery.

Like Filip and others the solution was to set i915.enable_rc6=0. I have tried
all other solutions presented in this thread to no avail.

I have tried capturing something (**anything**) from these crashes with no
luck. I tried using Kdump and a PSTORE EFI method as suggested by Imre. Nothing
works.

Now the potentially useful info:

o I don't use a DM, so I have to start X manually. My computer runs perfectly
if I don't start an X session. Absolutely no problems under all operating
conditions.

o As Imre recommended I tried booting with mode setting turned off. This
"worked". I put that in quotes because the graphical capabilities were very
reduced. The only driver that was able to run was xf86-video-fbdev and even
then X was, for example, not aware of any monitor settings and could not
support an external monitor. That said, I WAS able to fire up my WM and use my
computer in this reduced state with no crashes.

o I am currently running Arch Linux, but I confirmed that the crashes still
happen when using an Ubuntu Live USB. The Ubuntu I tested has linux 4.13.

I hope this information can be useful; please let me know if you need any more
information. I am watching this thread eagerly for a solution.

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