[Bug 89179] [gen4 drm] stuck on render ring - PLL state assertion failure (3.13)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89179

--- Comment #5 from Paulo Zanoni <przanoni at gmail.com> ---
(In reply to Maruthi Seshidhar from comment #4)
> The sysfs file /sys/class/drm/card0/error is an empty file after reboot.

Yes, that's expected.

> 
> Any pointers on how to collect the said file?

After the error happens, can you use another machine to SSH to the bugged
machine and collect the file?

You could also use some crazy strategies, like run a script that tries to copy
/sys/class/drm/card0/error to ~/error-$(date "+%H-%M").txt every minute, and
then when the hang happens you wait at least a minute, reboot the machine and
check the most recent non-empty files :)

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