Public bug reported:
Binary package hint: linux-image-2.6.20-1-generic
When my laptop wakes up after suspend, the serial port doesn't seem to
work anymore. Programs can read from and write to it as before, but the
data doesn't seem to be actually transmitted.
I don't know of any way to check the status of the serial port. After
searching Google, I saw other people mention that the serial port uses
IRQ 4, and its entry disappears from /proc/interrupts. But in my case,
it doesn't appear there in the first place.
Also, the serial port driver is built into the kernel, and not compiled
as a module. So I can't even try removing it and loading it again.
I'm using a Thinkpad T20, with ACPI enabled.
** Affects: linux-source-2.6.20 (Ubuntu)
Importance: Undecided
Status: Unconfirmed
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Serial port stops working after suspend
https://bugs.launchpad.net/bugs/105380
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