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

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Message-ID: <19611.32996.817920.499437@elektron.ikp.physik.tu-darmstadt.de>
Date:	Thu, 23 Sep 2010 18:31:32 +0200
From:	Uwe Bonnes <bon@...ktron.ikp.physik.tu-darmstadt.de>
To:	Randy Dunlap <rdunlap@...otime.net>
Cc:	Uwe Bonnes <bon@...ktron.ikp.physik.tu-darmstadt.de>,
	linux-kernel@...r.kernel.org
Subject: Re: Any SYSRQ key to force mode switch to console mode when using
 KMS?

>>>>> "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 ----------
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