In <393268FD.A8DF44DA@orga.com> John O'Connor (joconnor@orga.com) wrote:
> Hello,
> I'm currently trying to debug a device driver that I'm writing for a
> special purpose application.
> I have a problem whereby my driver freezes my system. (2.2.14 kernel)
> Reading the section on debugging techniques in Rubini's device drivers
> book, I was prompted to see if Shift-Printscreen would elicit any
> response.
It's there. Just not Shift-Printscreen but Shift-ScrollLock.
> It didn't so, just to check, I booted fresh and tried to see what would
> be the result of Shift-Printscreen.
> Still no result even though the system is running fine. (My driver is
> not loaded.)
No wonder - it's just wrong combination.
> I checked klogd and then halted it and restarted it with "klogd -c 5"
> but there was still no response to Shift-Printscreen. (Or CTRL-P or
> RightAlt-P)
> Is this function still there in the 2.2.14 kernel? If so, how to I turn
> it on?
It's there but if you plan to debug something then you REALLY should read
/usr/src/linux/Documentation/sysrq.txt and use "MAGIC SYSRQ" instead...
> Many thanks in advance.
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