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X goes blank with SAK SysRq

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Hi,

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 configuration

==================
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.

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

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