This my first message here. I opened a bug-report and i was redirected to this mailing list. The bug-report is https://bugzilla.kernel.org/show_bug.cgi?id=42937 and i found about this mailing list after i uploaded all attachments of all tests. I was really surprised by that. Basically, when i instert a media on a dvd writer (TEAC DV-W28SS-R) attached to a SATA-USB Bridge (Sunplus) plugged to a HUB (TERMINUS) attached to an USB controller there are USB Resets. Typical reset: Mar 15 12:44:25 slack kernel: [ 587.206783] usb 1-2.3: USB disconnect, device number 4 Mar 15 12:44:26 slack kernel: [ 588.140418] usb 1-2.3: new high-speed USB device number 5 using ehci_hcd Mar 15 12:44:26 slack kernel: [ 588.219672] usb 1-2.3: New USB device found, idVendor=1bcf, idProduct=0c31 Mar 15 12:44:26 slack kernel: [ 588.219675] usb 1-2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Mar 15 12:44:26 slack kernel: [ 588.219677] usb 1-2.3: Product: USB to Serial-ATA bridge Mar 15 12:44:26 slack kernel: [ 588.219679] usb 1-2.3: Manufacturer: Sunplus Innovation Technology Mar 15 12:44:26 slack kernel: [ 588.219681] usb 1-2.3: SerialNumber: DF0F28FF0F0001832517 Mar 15 12:44:26 slack kernel: [ 588.221377] scsi6 : usb-storage 1-2.3:1.0 Mar 15 12:44:27 slack kernel: [ 589.242436] scsi 6:0:0:0: CD-ROM TEAC DV-W28SS-R 1.0C PQ: 0 ANSI: 0 Mar 15 12:44:31 slack kernel: [ 593.815170] sr 6:0:0:0: Attached scsi generic sg1 type 5 Mar 15 12:44:40 slack kernel: [ 602.054781] usb 1-2.3: USB disconnect, device number 5 Mar 15 12:44:40 slack kernel: [ 602.732420] usb 1-2.3: new high-speed USB device number 6 using ehci_hcd Mar 15 12:44:40 slack kernel: [ 602.811672] usb 1-2.3: New USB device found, idVendor=1bcf, idProduct=0c31 Mar 15 12:44:40 slack kernel: [ 602.811676] usb 1-2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Mar 15 12:44:40 slack kernel: [ 602.811678] usb 1-2.3: Product: USB to Serial-ATA bridge Mar 15 12:44:40 slack kernel: [ 602.811680] usb 1-2.3: Manufacturer: Sunplus Innovation Technology Mar 15 12:44:40 slack kernel: [ 602.811681] usb 1-2.3: SerialNumber: DF0F28FF0F0001832517 Mar 15 12:44:40 slack kernel: [ 602.813384] scsi7 : usb-storage 1-2.3:1.0 Mar 15 12:44:41 slack kernel: [ 603.832439] scsi 7:0:0:0: CD-ROM TEAC DV-W28SS-R 1.0C PQ: 0 ANSI: 0 Mar 15 12:44:46 slack kernel: [ 608.511949] sr 7:0:0:0: Attached scsi generic sg1 type 5 I performed test on two systems, 3 usb controllers, and different os (it is already uploaded to te bug-report), the results varies with os version and controller. I was unable to reproduce the usb reset attaching the SATA-Bridge directly to the USB host controller. I plan to get more usb hubs and maybe another SATA-USB Bridge. Also, i was unable to reproduce the resets disabling the usb 2.0 speed in the bios. Thanks in advance. Guillermo. Reartes. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
