linux-kernel - Re: Any SYSRQ key to force mode switch to console mode when using KMS?

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Message-Id: <20100923080212.ca4be1f6.rdunlap@xenotime.net>
Date:	Thu, 23 Sep 2010 08:02:12 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Uwe Bonnes <bon@...ktron.ikp.physik.tu-darmstadt.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Any SYSRQ key to force mode switch to console mode when using
 KMS?

On Thu, 23 Sep 2010 15:01:39 +0200 Uwe Bonnes wrote:

> >>>>> "Uwe" == Uwe Bonnes <bon@...ktron.ikp.physik.tu-darmstadt.de> writes:
> 
> >>>>> "Randy" == Randy Dunlap <randy.dunlap@...cle.com> writes:
> ...
>     Uwe> However 2.6.36-rc4 also fixed my hibernate problem:
> 
>     Uwe> commit 84e1d836ef0759a152578a961894824bde89596f Merge: 20f4cad
>     Uwe> 6715045 Author: Linus Torvalds <torvalds@...ux-foundation.org>
>     Uwe> Date: Sat Sep 11 15:50:53 2010 -0700
> 
>     Uwe>     Merge branch 'pm-fixes' of
>     Uwe> git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6
>     
>     Uwe>     * 'pm-fixes' of ...  PM / Hibernate: Avoid hitting OOM during
>     Uwe> preallocation of memory ...
> 
>     Uwe> so I no longer hit the problem with the dark screen...
> 
> I burried the problem too early. 
> 
> On another hibernate attempt on 2.6.36-rc4, now the image again was not
> written to disk, the screen turn black and no ALT-CTL-SYSRQ combination
> helped. Especially I tried  ALT-CTL-SYSRQ ad 'v','V', ALT-CTL 'v' and
> ALT-CTL 'V'...

Is CONFIG_DRM_KMS_HELPER enabled in your kernel .config file?
If not, we need to find out how to enable it (there is no kconfig
prompt for it).

Can you check if Alt-Sysrq-H (help) lists V for "force-fb(V)"?

---
~Randy
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