Andrew Morton [off-list ref] writes:

Steven Cole [off-list ref] wrote:

quoted

I have one machine for testing which is running X, and a kexec reboot
 glitches the video system when initiated from runlevel 5.  Kexec works fine
 from runlevel 3.

Yes, there are a lot of driver issues with kexec.  Device drivers will assume
that the hardware is in the state which the BIOS left behind.

In this case, the Linus device driver's shutdown functions are obviously not
leaving the card in a pristine state.  A lot of drivers _do_ do this
correctly.  But some don't.

It seems that kexec is really supposed to be invoked from run level 1.  ie:
you run all your system's shutdown scripts before switching.  If you'd done
that then you wouldn't have been running X and all would be well.

do-kexec.sh is for the very impatient ;)

The biggest issue with kexec when you are in X is that nothing
tells X to shutdown.  So you have to at least shutdown X manually.

Eric
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