After connecting Creative Optical Mouse: hub 1-0:1.0: new USB device on port 2, assigned address 2 usb 1-2: config 0 descriptor?? Then I've run 'lsusb' (lsusb (usbutils) 0.11), it showed some output. But kernel oopsed silently. I found in dmesg: usbfs: process 1366 (lsusb) did not claim interface 0 before use Unable to handle kernel NULL pointer dereference at virtual address 000000c4 printing eip: d0a7726d *pde = 00000000 Oops: 0000 [#1] CPU: 0 EIP: 0060:[] Not tainted EFLAGS: 00010246 EIP is at usb_ifnum_to_if+0xd/0x40 [usbcore] eax: ffffff34 ebx: c78930c0 ecx: 00000000 edx: 00000000 esi: 00000000 edi: 00000000 ebp: 00000000 esp: c2317ee8 ds: 007b es: 007b ss: 0068 Process lsusb (pid: 1366, threadinfo=c2316000 task=c89119a0) Stack: c78930c0 00000000 00000000 d0a7d9b1 ffffff34 00000000 0000010b cb2e2d20 cb2e2d40 0001c8f4 efec7698 0000010b c2316000 caf1c000 c78930c0 cc53e200 00000000 cc549e40 d0a77490 ffffff34 00000000 00000000 cc53e224 d0a80b32 Call Trace: [] usb_set_interface+0x21/0x180 [usbcore] [] usb_driver_release_interface+0x40/0x60 [usbcore] [] releaseintf+0x82/0x90 [usbcore] [] usbdev_release+0xce/0xe0 [usbcore] [] __fput+0x10a/0x120 [] filp_close+0x59/0x90 [] sys_close+0x61/0xa0 [] syscall_call+0x7/0xb Code: 8b b0 90 01 00 00 0f b6 46 04 39 c1 7d 18 89 c3 8d 76 00 8b My hardware is some via board: 00:00.0 Host bridge: VIA Technologies, Inc. VT82C693A/694x [Apollo PRO133x] (rev 44) 00:01.0 PCI bridge: VIA Technologies, Inc. VT82C598/694x [Apollo MVP3/Pro133x AGP] 00:07.0 ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South] (rev 1b) 00:07.1 IDE interface: VIA Technologies, Inc. VT82C586/B/686A/B PIPC Bus Master IDE (rev 06) 00:07.2 USB Controller: VIA Technologies, Inc. USB (rev 0e) 00:07.3 USB Controller: VIA Technologies, Inc. USB (rev 0e) Usb-related modules loaded: Module Size Used by uhci_hcd 29904 0 usbcore 97788 3 uhci_hcd My .config attached. -- Tomasz Torcz "Never underestimate the bandwidth of a station zdzichu@irc.-nie.spam-.pl wagon filled with backup tapes." -- Jim Gray