linux-kernel - Re: Linux 2.6.32-rc8 - T500 fails to suspend to RAM

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Date:	Fri, 4 Dec 2009 15:44:59 -0800
From:	Andy Isaacson <adi@...apodia.org>
To:	Lior Dotan <liodot@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Linux 2.6.32-rc8 - T500 fails to suspend to RAM

Re-adding LKML.

On Fri, Dec 04, 2009 at 11:39:25PM +0200, Lior Dotan wrote:
> On Fri, Dec 4, 2009 at 10:24 PM, Andy Isaacson <adi@...apodia.org> wrote:
> > For what it's worth, I'm testing suspend-to-ram on Ubuntu 9.10 x86_64
> > with 2.6.32 final on a T500 and it's been pretty reliable -- I've
> > suspended by closing the lid at least a dozen times and it hasn't locked
> > up yet.
> 
> I'm using either KDE menu to suspend or hibernate-ram from hibernate-script.
> I will try to use the lid and see if it makes any difference.
> The strange thing is that I tried using rc6 & rc7 and they don't work now
> even though they used to, so I now I need to see what broke it.

I mentioned the lid because of BZ #14484 which is only on Intel GMA plus
using the lid switch to trigger suspend.  Since neither is relevant to
you it's just a red herring. :)

> > 1. are you using DMAR (VT-d)?  I'm not, and I had problems on another
> >   machine (also Core 2 Duo with GM45 graphics) when I tried suspending
> >   with CONFIG_DMAR=y.
>
>  I disabled DMAR but still no luck.

It's getting better but DMAR has still been a little problematic for me
the last few months.  Updating to the very latest BIOS does help
sometimes.

> > 2. are you running into http://bugzilla.kernel.org/show_bug.cgi?id=14484
> >   or a similar problem?
> > 3. (if you have GMA graphics) Are you up to date on the xorg-video-intel
> >   driver?  I'm using KMS and xorg-video-intel 2.9.0.  2.8.x is missing
> >   some relevant bugfixes.  (Of course if you have ATI graphics then
> >   this isn't relevant.)
> >
> I'm using the Radeon GPU so no KMS for me yet.

Sounds like your Radeon or fglrx driver got updated and broke
suspend/resume.

-andy
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