Ubuntu
linux-source-2.6.17 package

  1. Bug #74034
  2. Comment #12

Comment 12 for bug 74034

Revision history for this message
Matthew Williams (number6) wrote : Re: Serial ports of some HP Laptops don't work in Edgy

Dirk,

I MAY have figured out a work-around. Try the following and see if it fixes your problem. I am not sure why this problem occurs, but disabling and then re-enabling the PNP serial port seems to correctly initialize it. For some reason the newer kernels aren't correctly enabling our serial ports. I couldn't see a reason after a look through the two sets of kernel sources (dapper and feisty).

- cd /sys/bus/pnp/devices/00:02
- confirm that PNP device 00:02 is your serial port by doing a cat on "resources". It should show the standard ttyS0 serial port stuff with io ports starting at 3f8 and IRQ 4
- disable this device by "echo -n 2 > power/state"
- re-enable this device by "echo -n 0 > power/state"

Matt