Re: 2.6.0-test6: APM unable to suspend (the 2.6.0-test2 saga continues)

[Russell King <rmk+lkml@arm.linux.org.uk>]

On Sun, Dec 28, 2003 at 12:49:21PM -0800, Linus Torvalds wrote:
> On Sun, 28 Dec 2003, Russell King wrote:
> > 
> > Would it be possible to switch LDT/GDT to whatever the APM BIOS expects
> > just before calling the APM BIOS to suspend/hibernate, and restore them
> > to whatever Linux requires after the APM BIOS returns from resume?
> 
> Possible, yes. But it would help a lot to know what's wrong with the 
> current segments - we did leave most of them with exactly the same layout 
> as before, and I thought we explicitly left the ones that APM cares about 
> that way..

With thanks to Arjan, I think we've proven that this is not the change
which is causing the problem by testing various Red Hat and Fedora 2.4
kernels on the machine (which have various 2.6 NPTL backports.)

I'm now back to being completely out of my depth on this issue; a 2.4
kernel booted through to init=/bin/bash suspends, but a 2.6 kernel
with the same hardware support booted to the same point refuses to
suspend via APM.

I think I'm going to have to resort to a binary search of the 2.5
kernel series to find out exactly what broke and when.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 PCMCIA      - http://pcmcia.arm.linux.org.uk/
                 2.6 Serial core