Re: suspend to RAM failure on t61p

[Andrew Morton <akpm@linux-foundation.org>]

On Sun, 09 Dec 2007 13:40:07 +0100 Tomas Carnecky <tom@dbservice.com> wrote:

> Andrew Morton wrote:
> > 2.6.24-rc4 on a Lenovo t61p, using FC8 config.
> > 
> > echo mem > /sys/power/state while running X.
> > 
> > It appears to suspend OK but then it instantly resumes and runs
> > OK except the display is blank.
> 
> http://bugzilla.kernel.org/show_bug.cgi?id=9258
> 
> I have a X61 tablet, and the screen is blank after resume, too, but
> pressing ctrl+alt+F1/F7 usually fixes it. It seems a problem with the X
> video driver. I'm not sure though.
> 

This machine doesn't bring the display back after resume-from-RAM under
2.6.23 either.

The post-2.6.23 regresison here is that the suspend itself fails.  Under
2.6.23 the machine suspends and requires a keystrike to start resuming. 
Under 2.6.24-rc4 it just instantly resumes all by itself.

And I'm having real problems working out why 2.6.23 and 2.6.24-rc4 work
OK(ish) but anything in between won't boot: can't open /dev/root. 
Everything has scrolled off, no serial, no netconsole..