X goes blank with SAK SysRq

Raghavendra D Prabhu raghu.prabhu13 at gmail.com
Fri Jan 13 14:27:09 PST 2012


When Ctrl-Alt-Bksp (with zapping)  fails to resolve my 
hang, recently I read about SAK which also works as killing all 
on current console, and it is invoked as Alt-SysRq-K . 

However, I noticed that invoking it with X running puts the whole system 
into an unknown state -- blank screen on both monitors with my dual 
setup -- to be resolved only through REISUB SysRq combination. 

I tried SAK without X running and it works fine with getty 
respawing. With X running however it goes into above state, 
unresolvable without a hard reset or REISUB.

So, is anyone else facing this ? I am running with following 

X.Org X Server 1.11.3
Release Date: 2011-12-16
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.1.5-1-ARCH x86_64
Current Operating System: Linux Xye 3.2.0-rc7-VYX #142 SMP 
PREEMPT Thu Jan 5 19:18:50 IST 2012 x86_64
Kernel command line: root=/dev/sda6 ro quiet vga=773 
devtmpfs.mount=on acpi_osi=Linux intel_iommu=off
Build Date: 17 December 2011  09:17:41AM

Current version of pixman: 0.24.0
         Before reporting problems, check http://wiki.x.org
                 to make sure that you have the latest version.

Also, the graphics driver is nvidia 295.09.

There is another way to resolve hung X ie with SysRq-E but it 
kills all processes (even daemons) except init which I don't want.

Raghavendra Prabhu
GPG Id : 0xD72BE977
Fingerprint: B93F EBCB 8E05 7039 CD3C A4B8 A616 DCA1 D72B E977
www: wnohang.net
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