wacom_acpi.c is in drivers/serial/ but it's not able to be configured.
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wacom_acpi
https://launchpad.net/bugs/57922
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It's not a problem of driving the port, but waking it up.
It usually appears as /dev/ttyS4, but the device isn't there until the
wacom_acpi module is loaded.
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wacom_acpi
https://launchpad.net/bugs/57922
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It appears that in drivers/serial/Kconfig the SERIAL_WACOM_ACPI depends
on ACPI_BUS and that flag doesn't appear anymore.
This was an issue between Hoary and Warty also.
More info is here:
https://launchpad.net/distros/ubuntu/+source/linux-source-2.6.15/+bug/13196
I am working on the problem but
I'm still unable to convince the 8250_pnp to create a port for the wacom
tablet. I've compiled my own kernel, ensured that the 8250_pnp was
included and still not had any luck.
dmesg tells me about /dev/ttyS1 (the IR port) and makes no mention of
another tty device.
I've compared 8250_pnp.c and