It's not just z61m - I think this bug report just self-selected for z61m
users.  Other systems seem to be experiencing the same problem, so I
think this is a more general problem.  See:

https://bugs.launchpad.net/ubuntu/+source/linux-
source-2.6.22/+bug/126214

ATI + fglrx + SLAB + x.org seems to be the common element, along with
some as yet unclear other factor (Core 2 Duo?).

If this is widespread enough (as it's beginning to appear) it does beg
the question of whether sticking with SLAB is the best choice for Gutsy,
given that this breaks the "it just works" aspect of Ubuntu that is one
of it's biggest strengths (and what caused me to switch from Gentoo, at
least on my notebook).  Non-functional power-management is a pretty
serious issue for notebook users, who I'm guessing make up a decent
chunk of the userbase.  What alternatives are there to custom-compiling
a SLUB kernel + modules?  Could gutsy offer SLUB-enabled kernels and
modules alongside the default SLAB-enabled ones temporarily until this
is fixed upstream in fglrx?  It's a bandaid and a royal PITA, but at
least hardware would work as expected, and this wouldn't provide new
fodder for "Linux isn't ready for the desktop" articles.

Sigh.  Proprietary binary-only modules really *are* evil.  And to think
I originally developed a preference back in the day for ATI because they
supported open-source drivers and NVidia didn't.  At least things are
slowly coming full circle.

-- 
[gutsy] Suspend to Ram does not work on Z61m
https://bugs.launchpad.net/bugs/121653
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