suspend kills serial wacom tablet

[marco <marco@metm.org>]

Hello all,

I have a thinkpad X41-tablet which uses the linuxwacom serial drivers. 
The tablet works perfectly when the laptop first boots, but does not work
at all after resuming from sleep.  I posted to the linuxwacom list but
think that the problem might be more general in how acpi resumes the
serial ports.

As suggested here:
http://www.thinkwiki.org/wiki/Installing_Ubuntu_6.10_on_a_ThinkPad_X41_Tablet
I have added a script to resume.d which calls the setserial command:
  /bin/setserial /dev/ttyS0 port 0x0200 irq 5 autoconfig

>From looking at how Ubuntu at least stores the serial configurations, I
think that the above is redundant. If I try to run the above command from
the command line after resuming from sleep I get:
  Cannot autoconfigure port: Device or resource busy
If I try to cat /dev/ttyS0 after the resume, all my trackpoint and
keyboard die, no Ctrl-Alt-Delete etc. I have to cold reboot the system.

I have tried 
  > /dev/ttyS0
As was suggested on a tread in this list to about a serial console, but
that does not revive my tablet.  Also added the above line to the resume.d
script I wrote, but this does not work.

Any ideas of what I could do to revive this serial port?  Or if you think
I am completely on the wrong path, or am posting to the wrong list, please
let me know.

Thanks for the excellent work on the acpi infrastructure. I can tell you
that daily use of a laptop has become much more pleasurable thanks to you.

-- 
Marco