APM woes: IBM T20 Thinkpad

APM woes: IBM T20 Thinkpad

[Alex Hudson]

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I'm running a self-compiled Linux 2.4.16-pre1 on a IBM-T20, and am
seeing problems with APM.

Most times I suspend (apm --suspend) I can't un-suspend successfully
(I've managed it _once_ ;). This is since upgrading - I was previously
using a Debian version of 2.4.9. I have gone down to the console,
turning off most services (e.g., ps aux is about one screen-ful) and it
still doesn't work, so it doesn't appear to be some other service. 

When re-animating, the disks come on and the screen backlights, but
nothing much else. Disk access is non-existant (or at least,
sufficiently minimal that I can't detect it) and the network isn't
responding. 

I've also seen a couple of other apm-wierdos - the battery being at 99%
full, for example, even after being on the charger for a while. I also
tend to see a lot of disk activity - the light flashes several times a
second - but then, I'm usually heavily into swap (running Gnome, etc..).

If someone could point out some tests I could try to pin this down, or
has some other suggestion, I would be very grateful.

Cheers,

Alex.


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Re: APM woes: IBM T20 Thinkpad

[Alex Bligh - linux-kernel]

Alex,

--On Saturday, 08 December, 2001 11:20 PM +0000 Alex Hudson 
<home@alexhudson.com> wrote:

> I'm running a self-compiled Linux 2.4.16-pre1 on a IBM-T20, and am
> seeing problems with APM.
...
> If someone could point out some tests I could try to pin this down, or
> has some other suggestion, I would be very grateful.

This is what I did to try and get a T23 to work (which isn't
a T20, I know).

First upgrade your BIOS and/or system controller - available
FOC from the IBM web site.

If that doesn't fix it, try changing whether or not interrupts
are allowed during suspend. I think for a T20 they should *not*
be, but the T23 crashes if they are *not* (and needs it the
other way around). Don't just fiddle with the config option as
pci_quirks will override it. Either look at doing something like
  http://www.alex.org.uk/T23/T23-apm-patch.txt
or just frig the code yourself to force apm.allow_ints one way
or another.

--
Alex Bligh

Re: APM woes: IBM T20 Thinkpad

[Thomas Hood]

Try installing a new battery.

> I've also seen a couple of other apm-wierdos - the battery
> being at 99% full even after being on the charger for a while

This isn't necessarily abnormal.  The firmware may be 
switching off the charger when the battery is close
to full, in order to preserve battery life.