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

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Message-Id: <20100924080707.ba98fa1e.rdunlap@xenotime.net>
Date:	Fri, 24 Sep 2010 08:07:07 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Uwe Bonnes <bon@...ktron.ikp.physik.tu-darmstadt.de>
Cc:	linux-kernel@...r.kernel.org, David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: Any SYSRQ key to force mode switch to console mode when using
 KMS?

On Thu, 23 Sep 2010 18:31:32 +0200 Uwe Bonnes wrote:

[just adding cc's]

> >>>>> "Randy" == Randy Dunlap <rdunlap@...otime.net> writes:
> 
> 
>     Randy> Is CONFIG_DRM_KMS_HELPER enabled in your kernel .config file?  If
>     Randy> not, we need to find out how to enable it (there is no kconfig
>     Randy> prompt for it).
> 
> Yes, it is enabled
> 
>     Randy> Can you check if Alt-Sysrq-H (help) lists V for "force-fb(V)"?
> Yes, it is listed.
> 
> And yes, my last experiments where with ALT-CTL-sysreq, so doomed for non
> function due to operator error.
> 
> However:
> When running X, X.Org X Server 1.9.0 on Thinkpad R50 RV250, Alt-Sysrq-v
> switches to an all-black display. By console switching with ALT-CLT-F1 I
> get back to the booting console and ALT-CLT-F7 brings me back to X.  Running
> on the console and calling Alt-Sysrq-v prints
>  SysRq : Restore framebuffer console
> 
> Is there some omission by the distribution or my setup that Alt-Sysrq-v when
> running X results in an all-black screen?
> 
> And when I hit the hibernate problem, the screen stays black even with a
> console switch after Alt-Sysrq-v
> 
> Bye
> -- 
> Uwe Bonnes                bon@...ktron.ikp.physik.tu-darmstadt.de
> 
> Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
> --------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------


---
~Randy
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