Messages in this thread | | | Date | Sat, 18 Feb 2012 11:54:25 +1300 | Subject | Hang on "echo b > /proc/sysrq-trigger" | From | Keith Chew <> |
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Hi
To test the reliability of a hardware, I have a script which reboots a machine every 15 minutes after boot up. This machine has a dual video output, VGA and DVI-D, both driven via an intel GM45 chipset (I am using kernel 2.6.39.24 kernel intel drivers).
Some interesting results (which can be reproduced consistently): "echo b > /proc/sysrq-trigger" via DVI-D - after 2-3 days, it hangs (freezes) before reboot (dmesg only shows "Resetting...", nothing after that, no panic, stack trace, etc) "echo b > /proc/sysrq-trigger" via VGA - runs > 1 week "reboot -fn" via VGA or DVI-D - runs > 1 week "reboot" via VGA or DVI-D - runs > 1 week
I suspect that the intel graphics driver is not happy with the "echo b > /proc/sysrq-trigger" when it is still running.
I would like to make the "echo b" successfully reboot the machine, but this would appear to be a hardware bug? Is there anything that can be done in the kernel to make the "echo b" successfully work 100%?
Regards Keith
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