Hi,
Is the port interrupt-driven, or polling, on your system, Andreas?
//Peter
dmesg:
[ 63.699013] pnp: the driver 'parport_pc' has been registered [ 63.699116] parport0: PC-style at 0x378 (0x778) [PCSPP,TRISTATE] [ 63.828395] parport0: irq 7 detected [ 63.853986] parport0: Printer, Hewlett-Packard HP LaserJet 5L [ 63.857440] lp0: using parport0 (polling). [ 63.878908] ppdev: user-space parallel port driver