[RFC] Try a bit harder to get output on the screen at panic time

[Jesse Barnes]

On Fri, 9 Apr 2010 15:10:50 -0700
Jesse Barnes <jbarnes at virtuousgeek.org> wrote:

> This set of 3 patches makes it a little more likely we'll get panic
> output onto the screen even when X is running, assuming a KMS enabled
> stack anyway.
> 
> It gets me from a blank or very sparsely populated black screen at
> panic time, to one including the full backtrace and panic output at
> panic time (tested with "echo c > /proc/sysrq-trigger" from an X
> session).
> 
> It doesn't cover every case; for instance I think it'll fail when X has
> disabled the display, but those cases need to be handled with separate
> patches anyway (need to add atomic DPMS paths for instance).
> 
> Anyway, please test these out and let me know if they work for you.

Ping Linus & Dave again.  Have you guys tried these?  Really, it's cool.

-- 
Jesse Barnes, Intel Open Source Technology Center