Bug#455769: same problem on wheezy + Thinkpad X220T

[Steve Cotton]

On Thu, Mar 28, 2013 at 08:51:27PM +0100, Florian Lohoff wrote:
> I am using Wheezy on a T410 and suspend has never been worse than now
> With squeeze i simply closed the lid and put the notebook away.
> With wheezy its a 1 in 3 chance to suspend. Typically when it 
> fails it wont even work the second round - Not even by clicking
> on suspend in the menus. It switches away from X - locks the screen 
> and comes back to X ... 

Hi Florian,

That sounds like a different bug (not 455769).  In your case, the
laptop is trying to respond to the lid close, and failing later.

I've seen that pattern of "switches away from X, locks the screen
and comes back to X.  If it fails once then it fails repeatedly".

Two causes that I know of:

If the kernel package has been upgraded.

If lots of virtual memory has already been swapped to disk.  The
swap partition is shared between hibernation and normal swapping
of virtual memory, and there isn't enough free swap for
hibernation to dump the physical memory into.

The difference between Squeeze and Wheezy might just be that
Wheezy's newer packages use more memory.

When it happens it's certainly poor user experience.  Adding UI to
explain why the hibernate failed would be helpful.  But I don't
know which packages that wishlist bug should be raised on, and
it's the sort of thing that I'd expect to come from upstreams
rather than being a Debian patch.

Regards,
Steve