[ltp] Re: cannot resume after hotplugging an ultrabay battery in T61p

[Marc MERLIN]

Were you able to find any config options that don't look good to you?

Similarly, I have a nagging but annoying problem where my laptop will
occasionally hard deadlock when I plug the power back in while it was
running on batteries.

I've had this problem for quite a while too, across kernel version, and
interestingly enough, restarting acpid from cron may have been a workaround 
in the past, and of course I can't reproduce that one at will either, so
it's hard to get a debugging setup when it happens.
This actually started happening at the same time that for some dumb reason,
acpid stopped logging to /var/log/acpid more than a year ago :(

I just upgraded to 2.6.28.4 so we'll see what happens, but if you have
recommendations on kernel options, debugging, or other ideas, I'm all ears.
(like can I debug on usb serial, or do I need real serial?)

Thanks,
Marc

On Fri, Jan 30, 2009 at 10:58:56AM -0800, Marc MERLIN wrote:
> 
> Hi,
> 
> Thanks for your reply and sorry for the delay, for some reason I never got
> your reply by Cc or the linux-thinkpad list, but found it in the ibm-acpi-devel
> web archive.
> 
> Henrique de Moraes Holschuh wrote wrote:
> > On Wed, 21 Jan 2009, Marc MERLIN wrote:
> > > I realize this is a corner case, I've only hit it a few times since I
> > > typically do not use my ultrabay battery, but I can reproduce this with
> > > multiple kernels (up to 2.6.28):
> > 
> > It would be nice to know which kernel does NOT show the problem, even if it
> > is somewhat old.
> 
> I'm pretty sure I could do that with 2.6.22 or 2.6.24 but those did not
> recognize the battery when I hotswapped it, although it did work.
> If that old kernels help, I can do some test with those if you'd like
> (also tell me what data to gather, if any).
> 
> > > If I remove the ultrabay battery after hotswapping the main battery,
> > > things work ok after that.
> > > If I leave the ultrabay battery and suspend the laptop, on resume I get
> > > text mode and blinking cursor and nothing after that, the laptop is just
> > > dead.
> > 
> > What is the kernel configuration you're using, please?
>  
> http://marc.merlins.org/tmp/config
 
> > > Can you reproduce and possibly fix?
> > 
> > I can't seem to reproduce it on my T43.
> > 
> > > (it's hard for me to give debug since the laptop is dead on resume)
> > 
> > Usually you can get it to output data to the serial port (serial console) or
> > a network console, but that requires another computer to which you can send
> > the data to see it.
> 
> I take it that usb-serial won't work, but I think the docking station has
> serial on it. I might be able to borrow one.
> If I do and do serial console, would I get some output on that serial port
> at resume time you think?
> 
> Marc

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Home page: http://marc.merlins.org/