Description of problem: Version-Release number of selected component (if applicable): How reproducible: Steps to Reproduce: 1.Upgrade kernel to 2.6.16-1.2069_FC4 2.Reboot 3.Kernel is unable to register serial port for modem Actual results: Apr 15 18:37:00 freedom kernel: Couldn't register serial port 0000:00:0a.0: -28 Expected results: Apr 15 20:38:14 freedom kernel: ttyS14 at I/O 0xc000 (irq = 5) is a 16550A Additional info: lspci -v -s 00:0a.0 00:0a.0 Communication controller: Agere Systems Venus Modem (V90, 56KFlex) Subsystem: Actiontec Electronics Inc: Unknown device 0480 Flags: bus master, medium devsel, latency 0, IRQ 5 Memory at ef001000 (32-bit, non-prefetchable) [size=256] I/O ports at c000 [size=256] I/O ports at c400 [size=256] I/O ports at c800 [size=8] Capabilities: [f8] Power Management version 2 udev-071-0.FC4.3 By reverting to kernel-2.6.14-1.1653_FC4 the modem's serial port is registered.
how many serial ports do you have ? If you boot with 8250.nr_uarts=8 (or however many), does it start working again?