Fairly recent SuSE 9.0 Pro install, Asus A7V8X motherboard, Athlon 2400+ CPU. The motherboard has six USB2.0 ports and three firewire ports. I'm having trouble with most, but not all, USB devices. I have a Dazzle multiformat card which works with CF cards but not SD cards, which is what I really want. I also have a Sandisk Cruzer 256MN USB thumb drive, and a external USB2.0 IDE enclosure. Both devices work on a Red Hat 9 box I have, and under Windows. The strange thing is that the devices are seen on the USB bus, but I can't access them, no matter how I try. The relevant section of /proc/bus/usb is: C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=256ms T: Bus=01 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#= 2 Spd=480 MxCh= 0 D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=0781 ProdID=8185 Rev= 1.25 S: Manufacturer=SanDisk Corporation S: Product=Cruzer Mini S: SerialNumber=000182341 The output of lsusb is: Bus 004 Device 001: ID 0000:0000 Bus 003 Device 001: ID 0000:0000 Bus 002 Device 001: ID 0000:0000 Bus 002 Device 002: ID 051d:0002 American Power Conversion Back-UPS Pro 500 Bus 001 Device 001: ID 0000:0000 Bus 001 Device 002: ID 0781:8185 SanDisk Corp. However, if I try "fdisk -l /dev/sda", or "cdrecord -scanbus", or "mount /dev/ sda1", those programs just hang indefinitely. I can't kill -9 it, but if I kill -9 the shell, it dies. I've STFW and seen references to USB problems due to IRQ problems. cat /proc/interrupts CPU0 0: 86658338 XT-PIC timer 1: 30031 XT-PIC keyboard 2: 0 XT-PIC cascade 8: 2 XT-PIC rtc 9: 259461 XT-PIC acpi, DE450-TA (eth0), ehci_hcd, usb-uhci, usb-uhci, usb-uhci 10: 2236 XT-PIC eth1, ohci1394 11: 7332626 XT-PIC EMU10K1, radeon@PCI:1:0:0 12: 388710 XT-PIC PS/2 Mouse 14: 1364913 XT-PIC ide0 15: 269 XT-PIC ide1 NMI: 0 LOC: 0 ERR: 422 MIS: 0 I've also tried turning off ACPI in grub, and disabling as much on-motherboard hardware as possible. I don't know why it says radeon@PCI:1:0:0, when my video card is a ATI AIW 7500 AGP card, though. Hope I gave enough information/ ---------------------------------------------------------------------------- DDDD David Kramer david@thekramers.net http://thekramers.net DK KD DKK D Shop smart! Shop S-Mart DK KD DDDD