[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 #50 from Timo Teräs <timo.teras at iki.fi> ---
Created attachment 144792
  --> https://bugs.freedesktop.org/attachment.cgi?id=144792&action=edit
various dmesg w/ drm.debug=0xe on dell laptop

Find attached the dmesg of boot up, successful power down/up and finally from
the crash. After several attempts I managed to get two WARN_ON() back traces on
it, so it might actually be very useful.

The power off is done by XFCE Power Manager: Settings > Power Manager > Display
tab > Display power management (enabled, with switch off at 1 minutes). I then
wait for 1 minute for power off. Power on is attempted by typing on keyboard.

It seems that sometimes the crash happens pretty soon after powering display
off (e.g. system crash can happen earlier than 60 seconds). It seems to be
total hang as I had a little loop copying uptime to a file and running 'sync'.
And that stops usually around the time display wake up is attempted.

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