linux-kernel - Re: Kernel OOPS when reloading i915 after resume from suspend

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Message-ID: <20140703103846.GA12400@amd.pavel.ucw.cz>
Date:	Thu, 3 Jul 2014 12:38:46 +0200
From:	Pavel Machek <pavel@....cz>
To:	Thomas Richter <thor@...h.tu-berlin.de>
Cc:	linux-kernel@...r.kernel.org,
	Ville Syrj?l? <ville.syrjala@...ux.intel.com>,
	Daniel Vetter <daniel@...ll.ch>
Subject: Re: Kernel OOPS when reloading i915 after resume from suspend

Hi!

> >>1) Shut down X,
> >>2) Unbind the consoles:
> >>
> >>echo 0 > /sys/class/vtconsole/vtcon1/bind
> >>echo 0 > /sys/class/vtconsole/vtcon0/bind
> >>
> >>3) Remove the i915
> >>
> >>rmmod i915
> >>
> >>4) Suspend the system
> >>
> >>pm-suspend
> >
> >Does it also break with plain echo mem > /sys/power/state?
> 
> No. If the modules stay resident, any user driven shutdown/resume
> events by writing into /sys/power/state work just fine.
> 
> >Does it break when you don't suspend at all?
> 
> No. Unloading and reloading i915 under normal conditions also works fine.
> 
> >>5) Resume the system by pressing on the power-button.
> >>6) Reload the i915 module with
> >>
> >>modprobe i915.
> >>
> >>Result is a kernel-Oops:
> >
> >Sounds like problem in suspend/resume framework, actually :-(.
> 
> Good guess, but wrong. The BIOS leaves the 830GM in a state the i915
> does not seem to like.

Ok, good, something for Intel people to solve, then...
									Pavel

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