On Fri, 14 Oct 2016, Benjamin Staton wrote: > The Issue: Scanning (with xsane 0.999) while using kernel 4.8 (I > tested 4.8 rc1, rc5, rc7, rc8, and 4.8.1) fails when the scanner > becomes disconnected from the USB bus. Every time. > > Scanning (with xsane 0.999) while using kernel 4.7.0 or earlier 4's > works without fail. > > My scanner is known to lsusb as "Bus 006 Device 002: ID 04a9:2206 > Canon, Inc. CanoScan N650U/N656U" and to Xsane as "Canon CanoScan > N650U/N flatbed scanner [plustek:libusb:006:002]". > > Relevant lines from /var/log/kern.log at the time of the disconnect: > Oct 14 13:30:00 quiz kernel: [ 167.746817] ohci-pci 0000:00:12.0: > HcDoneHead not written back; disabled > Oct 14 13:30:00 quiz kernel: [ 167.746829] ohci-pci 0000:00:12.0: HC > died; cleaning up > Oct 14 13:30:00 quiz kernel: [ 167.746916] usb 6-1: USB disconnect, > device number 2 > Oct 14 13:30:00 quiz kernel: [ 167.747618] usb 6-3: USB disconnect, > device number 3 > Oct 14 13:30:00 quiz kernel: [ 167.747624] usb 6-3.2: USB disconnect, > device number 4 > Oct 14 13:30:00 quiz kernel: [ 167.803283] usb 6-3.3: USB disconnect, > device number 5 > > This is on an asrock 970M Pro3 motherboard w/AMD FX-8300 CPU and 32GB > RAM running debian testing/9. Kernels built from kernel.org without > further patching. > > Apologies for posting to wrong place (bugzilla) and happy to provide more info. Can you run git bisect between 4.7 and 4.8-rc1 to find the particular commit that introduced this problem? There haven't been any significant changes to the ohci-hcd driver during that period. Alan Stern -- 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
