> > > I have a Dell Latitude C640 and my screen won't come back after a suspend.
> > > The machine works fine besides that.
> > 
> > OK, I think this is not related with ACPI CA code update.
> If that was not clear, it also didn't work before.

understood.  I meant that ACPI CA code changes won't
solve the individual device problems in many cases.

> > If you have this problem w/ X running, and don't have w/o X,
> > please try attached patches.
> It's unrelated to X.
> Other ideas?

How about this one?

This simply set PCI_POWERSTATE_D0 for VGA device on wakeup.

If this don't solve your problem, I think graphic chip need to be
re-initialized on wakeup.  Maybe needs time...
Some VAIO machines (w/ ATI graphic chip), also have the same problem.


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