DVI monitor won't wake up?
Ben Scott
dragonhawk at gmail.com
Tue Apr 4 22:44:00 EDT 2006
On 4/4/06, Cole Tuininga <colet at code-energy.com> wrote:
>> What about the "magic SysRq keys"?
>
> Hmmm - this is new to me. I've heard the term before, but never knew
> what it was.
Basically, if enabled, they are a set of keystrokes that tell the
kernel to do certain things. Examples: Sync disks; reset keyboard;
re-mount all filesystems read-only; reboot; power off. They're
occasionally useful when the system is *really* hosed, as they will
often survive when everything else is dead.
Google for "magic sysrq" for all the details.
One thing I've used this for before is recovering from a crashed X
server. [Alt]+[SysRq]+[R] resets the keyboard. At that point, I can
type, although the display is still hosed. So [Alt]+[F1] switches to
VC1. Then I login as root (blindly), and issue a "vga_reset" command
(which I think I got as a demo program from svgalib).
> Is there any easy way to see if it's enabled in my
> kernel ... remotely? 8)
cat /proc/sys/kernel/sysrq
If 0, present but disabled. If 1, present and enabled. If not
found, not present in the kernel.
The more I think about it, the more I think all this may not help.
The fact that the card stays hosed over a warm reboot implies the
card's internal hardware state is really fscked up. It might even be
faulty hardware -- have you tested this with *ahem* "other" OSes?
-- Ben
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