Alan Stern <stern@...> writes: > What version of the kernel was this? Sorry, I forgot to mention the kernel version. It's 2.6.30-020630rc4-generic taken from [1] I redid the test, this time I used "udevadm monitor" as well to see what happens. First, I mounted debugfs and ran: root@user-laptop:~# mount -t debugfs none_debugs /sys/kernel/debug/ root@user-laptop:~# cat /sys/kernel/debug/usbmon/6u > /var/tmp/2.mon.out udev output is below: KERNEL[1243083830.194150] add /kernel/slab/mon_text_f4802080 (slab) UDEV [1243083830.196134] add /kernel/slab/mon_text_f4802080 (slab) Next, I plugged in the modem: /var/log/messages output: May 23 16:04:34 user-laptop kernel: [ 330.172203] usb 6-1: new full speed USB device using uhci_hcd and address 2 May 23 16:04:34 user-laptop kernel: [ 330.331386] usb 6-1: configuration #1 chosen from 1 choice May 23 16:04:35 user-laptop kernel: [ 331.683198] Initializing USB Mass Storage driver... May 23 16:04:35 user-laptop kernel: [ 331.690366] usb-storage: probe of 6-1:1.0 failed with error -5 May 23 16:04:35 user-laptop kernel: [ 331.690694] usbcore: registered new interface driver usb-storage May 23 16:04:35 user-laptop kernel: [ 331.690708] USB Mass Storage support registered. udev monitor output: KERNEL[1243083874.510788] add /devices/pci0000:00/0000:00:1d.0/usb6/6-1 (usb) KERNEL[1243083874.512269] add /devices/pci0000:00/0000:00:1d.0/usb6/6-1/ 6-1:1.0 (usb) KERNEL[1243083874.512333] add /devices/pci0000:00/0000:00:1d.0/usb6/6-1/ 6-1:1.0/usb_endpoint/usbdev6.2_ep87 (usb_endpoint) KERNEL[1243083874.512389] add /devices/pci0000:00/0000:00:1d.0/usb6/6-1/ 6-1:1.0/usb_endpoint/usbdev6.2_ep08 (usb_endpoint) KERNEL[1243083874.512436] add /devices/pci0000:00/0000:00:1d.0/usb6/6-1/ usb_endpoint/usbdev6.2_ep00 (usb_endpoint) UDEV [1243083875.753386] add /devices/pci0000:00/0000:00:1d.0/usb6/6-1 (usb) UDEV [1243083875.790552] add /devices/pci0000:00/0000:00:1d.0/usb6/6-1/ usb_endpoint/usbdev6.2_ep00 (usb_endpoint) KERNEL[1243083875.861604] add /module/usb_storage (module) UDEV [1243083875.864084] add /module/usb_storage (module) KERNEL[1243083875.869150] add /bus/usb/drivers/usb-storage (drivers) UDEV [1243083875.870079] add /devices/pci0000:00/0000:00:1d.0/usb6/6-1/ 6-1:1.0 (usb) UDEV [1243083875.874021] add /bus/usb/drivers/usb-storage (drivers) UDEV [1243083875.879621] add /devices/pci0000:00/0000:00:1d.0/usb6/6-1/ 6-1:1.0/usb_endpoint/usbdev6.2_ep08 (usb_endpoint) UDEV [1243083875.908979] add /devices/pci0000:00/0000:00:1d.0/usb6/6-1/ 6-1:1.0/usb_endpoint/usbdev6.2_ep87 (usb_endpoint) Contents of /var/tmp/2.mon.out is below: ===cut here=== f5bf4200 2432593187 S Ci:6:001:0 s a3 00 0000 0001 0004 4 < f5bf4200 2432593214 C Ci:6:001:0 0 4 = 01010100 f5bf4200 2432593221 S Co:6:001:0 s 23 01 0010 0001 0000 0 f5bf4200 2432593229 C Co:6:001:0 0 0 f5bf4200 2432593233 S Ci:6:001:0 s a3 00 0000 0002 0004 4 < f5bf4200 2432593242 C Ci:6:001:0 0 4 = 00010000 f6834c00 2432697074 S Ii:6:001:1 -115:128 2 < f5bf4200 2432697100 S Ci:6:001:0 s a3 00 0000 0001 0004 4 < f5bf4200 2432697112 C Ci:6:001:0 0 4 = 01010000 f5bf4200 2432697132 S Co:6:001:0 s 23 03 0004 0001 0000 0 f5bf4200 2432697141 C Co:6:001:0 0 0 f5bf4200 2432752611 S Ci:6:001:0 s a3 00 0000 0001 0004 4 < f5bf4200 2432752644 C Ci:6:001:0 0 4 = 03010000 f5bf4200 2432808691 S Co:6:001:0 s 23 01 0014 0001 0000 0 f5bf4200 2432808702 C Co:6:001:0 0 0 f5bf4200 2432808729 S Ci:6:000:0 s 80 06 0100 0000 0040 64 < f5bf4200 2432812656 C Ci:6:000:0 0 18 = 12011001 00000040 c6050010 00000102 0301 f5bf4200 2432812711 S Co:6:001:0 s 23 03 0004 0001 0000 0 f5bf4200 2432812723 C Co:6:001:0 0 0 f5bf4200 2432868613 S Ci:6:001:0 s a3 00 0000 0001 0004 4 < f5bf4200 2432868647 C Ci:6:001:0 0 4 = 03010000 f5bf4d80 2432924687 S Co:6:001:0 s 23 01 0014 0001 0000 0 f5bf4d80 2432924699 C Co:6:001:0 0 0 f5bf4d80 2432924707 S Co:6:000:0 s 00 05 0002 0000 0000 0 f5bf4d80 2432927681 C Co:6:000:0 0 0 f5bf4d80 2432944600 S Ci:6:002:0 s 80 06 0100 0000 0012 18 < f5bf4d80 2432948738 C Ci:6:002:0 0 18 = 12011001 00000040 c6050010 00000102 0301 f5bf4d80 2432948806 S Ci:6:002:0 s 80 06 0200 0000 0009 9 < f5bf4d80 2432951645 C Ci:6:002:0 0 9 = 09022000 01010080 fa f5bf4d80 2432951671 S Ci:6:002:0 s 80 06 0200 0000 0020 32 < f5bf4d80 2432955733 C Ci:6:002:0 0 32 = 09022000 01010080 fa090400 00020806 50000705 87024000 00070508 02400000 f5bf4d80 2432955799 S Ci:6:002:0 s 80 06 0300 0000 00ff 255 < f5bf4d80 2432958646 C Ci:6:002:0 0 4 = 04030904 f5bf4d80 2432958695 S Ci:6:002:0 s 80 06 0302 0409 00ff 255 < f5bf4d80 2432961643 C Ci:6:002:0 0 32 = 20035500 53004200 20004d00 4d004300 20005300 74006f00 72006100 67006500 f5bf4d80 2432961691 S Ci:6:002:0 s 80 06 0301 0409 00ff 255 < f5bf4d80 2432964738 C Ci:6:002:0 0 40 = 28034100 6e007900 44004100 54004100 20004300 6f007200 70006f00 72006100 f5bf4d80 2432964782 S Ci:6:002:0 s 80 06 0303 0409 00ff 255 < f5bf4d80 2432967647 C Ci:6:002:0 0 26 = 1a033000 30003000 30003000 30003000 30003000 30003000 3200 f5bf4d80 2432967918 S Co:6:002:0 s 00 09 0001 0000 0000 0 f5bf4d80 2432969639 C Co:6:002:0 0 0 f48a5e00 2433204969 S Co:6:002:0 s 02 01 0000 0008 0000 0 f48a5e00 2433206640 C Co:6:002:0 0 0 f48a5e00 2433206690 S Co:6:002:0 s 01 0b 0000 0000 0000 0 f48a5e00 2433207638 C Co:6:002:0 0 0 f48a5b80 2434208010 S Bo:6:002:8 -115 31 = 55534243 78563412 01000000 80000601 00000000 00000000 00000000 000000 f48a5b80 2434209624 C Bo:6:002:8 0 31 > f48a5b80 2434209755 S Bi:6:002:7 -115 256 < f48a5b80 2434210652 C Bi:6:002:7 -32 0 f5a76b80 2434322568 S Bo:6:002:8 -115 31 = 55534243 78563412 01000000 80000601 00000000 00000000 00000000 000000 f5a76b80 2434323640 C Bo:6:002:8 0 31 > f5a76b80 2434323694 S Bo:6:002:8 -115 1024 = 55534243 78563412 01000000 80000601 00000000 00000000 00000000 00000000 f5a76b80 2434325739 C Bo:6:002:8 -32 192 > f5a76b80 2434325791 S Co:6:002:0 s 02 01 0000 0008 0000 0 f5a76b80 2434326734 C Co:6:002:0 0 0 ===and here=== [1]: 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