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

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Message-ID: <20140702212219.GA2842@xo-6d-61-c0.localdomain>
Date:	Wed, 2 Jul 2014 23:22:19 +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>, rjw@...k.pl
Subject: Re: Kernel OOPS when reloading i915 after resume from suspend

Hi!

> still experimenting with the resume from suspend on the Fujitsu
> S6010. I can, however, still create a kernel oops. The kernel source
> comes from alm_fixes5, kernel 3.15.0-rc7+. For that, do the
> following:
> 
> 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?

Does it break when you don't suspend at all?

> 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 :-(.

									Pavel

> 
> Jun 29 19:34:00 tyleet kernel: [  321.283072] [drm] Memory usable by
> graphics device = 128M
> Jun 29 19:34:00 tyleet kernel: [  321.286770] [drm] Supports vblank
> timestamp caching Rev 2 (21.10.2013).
> Jun 29 19:34:00 tyleet kernel: [  321.286782] [drm] Driver supports
> precise vblank timestamp query.
> Jun 29 19:34:00 tyleet kernel: [  321.286959] [drm] applying pipe a
> force quirk
> Jun 29 19:34:00 tyleet kernel: [  321.286965] [drm] applying pipe b
> force quirk
> Jun 29 19:34:00 tyleet kernel: [  321.307436] *pde = 00000000
> Jun 29 19:34:00 tyleet kernel: [  321.307568] Oops: 0000 [#1]
> Jun 29 19:34:00 tyleet kernel: [  321.307751] Modules linked in:
> i915(+) michael_mic arc4 ecb lib80211_crypt_tkip lib80211_crypt_ccmp
> binfmt_misc fuse netconsole loop firewire_sbp2 hid_generic usbhid
> hid snd_intel8x0 sg snd_ac97_codec ac97_bus snd_pcm sr_mod snd_seq

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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