Description of problem: My USB hub is no longer recognized as USB 2.0 device, but downgraded to 1.1 automatically. So writing e.g. to an SD card never ends. /var/log/messages prints zillions of these kernel error messages after connecting the USB hub to any USB 2.0 port: Jan 6 16:36:28 bernd kernel: usb 1-1: new high speed USB device using ehci_hcd and address 20 Jan 6 16:36:28 bernd kernel: usb 1-1: device descriptor read/64, error -71 Jan 6 16:36:29 bernd kernel: usb 1-1: device not accepting address 21, error -71 ... Finally, the device is connected but runs at 1.1 speed: Jan 6 16:36:32 bernd kernel: hub 1-0:1.0: unable to enumerate USB device on port 1 Jan 6 16:36:32 bernd kernel: usb 2-1: new full speed USB device using ohci_hcd and address 3 Jan 6 16:36:32 bernd kernel: usb 2-1: not running at top speed; connect to a high speed hub Jan 6 16:36:32 bernd kernel: usb 2-1: configuration #1 chosen from 1 choice Jan 6 16:36:32 bernd kernel: scsi5 : SCSI emulation for USB Mass Storage devices Jan 6 16:36:32 bernd kernel: usb 2-1: New USB device found, idVendor=058f, idProduct=6377 Jan 6 16:36:32 bernd kernel: usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Jan 6 16:36:32 bernd kernel: usb 2-1: Product: Mass Storage Device Jan 6 16:36:32 bernd kernel: usb 2-1: Manufacturer: Generic Jan 6 16:36:37 bernd kernel: scsi 5:0:0:0: Direct-Access Generic USB SD Reader 1.00 PQ: 0 ANSI: 0 Jan 6 16:36:37 bernd kernel: sd 5:0:0:0: [sdb] Attached SCSI removable disk Jan 6 16:36:37 bernd kernel: sd 5:0:0:0: Attached scsi generic sg3 type 0 The device works without any errors under Fedora Core 5,6,7 (Kernel 2.6.20) on the same hardware. The device works without any problems under Windows 2000 or XP on the same hardware. Same error in Ubuntu 8.10 BTW. Tried all 2.6.27.7,8,9 kernels but no change. Version-Release number of selected component (if applicable): Kernel 2.6.27.7|8|9 How reproducible: Install this device on any Fedora 10 machine: ID 058f:6377 Alcor Micro Corp. Multimedia Card Reader Steps to Reproduce: 1. Attach USB hub to USB 2.0 port. 2. tail -f /var/log/messages Actual results: Most USB hubs no longer working under Fedora 10 (last known version to run was Fedora 7). Checked with other Alcor and Kingston hubs, same or similar problems. No problems under Windows 2000 or XP. Expected results: Device running at USB 2.0 speed without any errors in the log files. Additional info: Is this a kernel bug?
Checked today with FC7 and Kernel 2.6.21 again - device works perfectly, so the problem was introduced between linux 2.6.22 and 2.6.27. Will test with FC8 and other kernels in the next days, maybe we can find out more.
I see "works on the same hardware" in the original report, but I saw hardware failing during installation before, so it may be a failure of the Host Controller (HC). The key is to get two kernels (old - working, and new - broken) onto the same box. Usually it's easier to take an old userland, like F-9 and install an F-10 kernel on it with just rpm, or rpm --force. Then it's only one reboot to get back to old kernel. Once there, I'll need two usbmon traces from the old and new.
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