Alan Stern wrote: > On Wed, 25 Jul 2007, Jean-Claude Repetto wrote: > >> Hi, >> >> I have a device (a TomTom GPS) that is seen as a memory device when >> connected via USB. >> s >> If I plug the device before booting the PC, it is detected and >> accessible via /dev/sdb . >> But, if I plug the device after the PC has booted, the device is not >> accessible (the /dev/sdb device is not created). Idem if I disconnect >> and reconnect the device. >> >> I am using a x86 Gentoo system with kernel 2.6.22 (but I have also >> tested kernels 2.6.20 and 2.6.21). >> >> I have already asked for help on the Gentoo forums, but I got no useful >> answer. I hope I'll be more lucky here ! >> >> BTW, I have tested the same device on the same computer with Ubuntu >> 7.04, > > What version of the kernel does that use? Do you have a usb-storage > log showing what happens when you plug the device in after booting? >
The kernel is ubuntu-2.6.20-16 . Here is the log (but not in debug mode) : Jul 25 22:06:56 ubuntu kernel: [ 229.509634] usb 1-2: new full speed USB device using uhci_hcd and address 2 Jul 25 22:06:56 ubuntu kernel: [ 229.688469] usb 1-2: configuration #1 chosen from 1 choice Jul 25 22:06:57 ubuntu kernel: [ 229.801681] usbcore: registered new interface driver libusual Jul 25 22:06:57 ubuntu kernel: [ 229.824119] Initializing USB Mass Storage driver... Jul 25 22:06:57 ubuntu kernel: [ 229.824212] scsi2 : SCSI emulation for USB Mass Storage devices Jul 25 22:06:57 ubuntu kernel: [ 229.824274] usbcore: registered new interface driver usb-storage Jul 25 22:06:57 ubuntu kernel: [ 229.824278] USB Mass Storage support registered. Jul 25 22:07:02 ubuntu kernel: [ 234.824612] scsi 2:0:0:0: Direct-Access TomTom ONE PQ: 0 ANSI: 2 Jul 25 22:07:02 ubuntu kernel: [ 234.829627] sd 2:0:0:0: Attached scsi removable disk sdb Jul 25 22:07:02 ubuntu kernel: [ 234.829682] sd 2:0:0:0: Attached scsi generic sg1 type 0 Jul 25 22:07:02 ubuntu kernel: [ 235.003342] SCSI device sdb: 4019200 512-byte hdwr sectors (2058 MB) Jul 25 22:07:02 ubuntu kernel: [ 235.006335] sdb: Write Protect is off Jul 25 22:07:02 ubuntu kernel: [ 235.013324] SCSI device sdb: 4019200 512-byte hdwr sectors (2058 MB) Jul 25 22:07:02 ubuntu kernel: [ 235.016321] sdb: Write Protect is off Jul 25 22:07:02 ubuntu kernel: [ 235.016769] sdb: >> and it is working, so it is not a problem with the hardware or the >> device firmware. > > It may be a question of the initial delay. If you plug the device in > before booting then it has a long period during which it can > initialize, but if you plug it in later then there's only a 5-second > delay. > > You can try increasing the length of that delay. In /etc/modprobe.conf > put a line saying: > > options usb-storage delay_use=30 > > and then rmmod usb-storage. That will increase the delay to 30 > seconds. Try various numbers and see if you can find something that > works. I have tried several delays, longer or shorter than the default (5 seconds), but no success ! Jean-Claude ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
