Hi Alan, tried as you suggested to config out IrDA and indeed the kernel boots. Even in -ac20 my Dell Latitude laptop hangs in the RH7.0 init sequence after printing the IRCOMM line. C-A-D doesn't do anything but I can use Magic Sysrq to reboot. I am available for further diagnostic investigation. Just in case, this is my IrDA h/w (booted into 2.4.3-pre4). [root@princess /root]# findchip -v Found SMC FDC37N958FR Controller at 0x3f0, DevID=0x01, Rev. 1 SIR Base 0x3e8, FIR Base 0x290 IRQ = 4, DMA = 3 Enabled: yes, Suspended: no UART compatible: yes Half duplex delay = 3 us Thanks & ciao, --alessandro <[EMAIL PROTECTED]> <[EMAIL PROTECTED]> Linux: kernel 2.2.19p17/2.4.3p4 glibc-2.2 gcc-2.96-69 binutils-2.11.90.0.1 Oracle: Oracle8i 8.1.7.0.1 Enterprise Edition for Linux motto: Tell the truth, there's less to remember. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/