On Fri, Oct 04, 2013 at 11:39:47AM -0500, Drew Von Spreecken wrote: > Sarah, I've enabled debugging for the module if it helps... Log attached. Hi Drew, > On 09/30/2013 06:19 PM, Sarah Sharp wrote: > >Hi Drew! > > > >I'm the xHCI driver maintainer, and it helps to Cc me on issues with USB > >devices under xHCI hosts. > > > >On Sun, Sep 29, 2013 at 11:14:47AM -0500, Drew Von Spreecken wrote: > >>I have an Elan touchscreen that is causing USB resets and errors at > >>boot and intermittently during use. The touchscreen works as > >>expected but messages are still being logged to kern.log. > >> > >>It appears to get detected correctly: > >> > >>Bus 001 Device 002: ID 8087:8000 Intel Corp. > >>Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub > >>Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub > >>Bus 002 Device 013: ID 04f3:0089 Elan Microelectronics Corp. > >>Bus 002 Device 004: ID 2232:1049 > >>Bus 002 Device 003: ID 8087:07dc Intel Corp. > >>Bus 002 Device 017: ID 18d1:4ee2 Google Inc. Nexus 4 (debug) > >>Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub > >> > >>The recurring output of dmesg: > >>[ 523.082262] usb 2-7: new full-speed USB device number 9 using xhci_hcd > >>[ 525.186961] usb 2-7: unable to read config index 0 descriptor/start: -71 > >>[ 525.186972] usb 2-7: can't read configurations, error -71 These errors look interesting: > Oct 3 21:37:46 8bit kernel: [ 3.861123] usb 1-7: unable to read config index 0 descriptor/start: -71 > Oct 3 21:37:46 8bit kernel: [ 3.861129] usb 1-7: can't read configurations, error -71 > Oct 3 21:37:46 8bit kernel: [ 4.026929] usb 1-7: new full-speed USB device number 5 using xhci_hcd > Oct 3 21:37:46 8bit kernel: [ 6.060326] usb 1-7: unable to read config index 0 descriptor/start: -71 > Oct 3 21:37:46 8bit kernel: [ 6.060331] usb 1-7: can't read configurations, error -71 > Oct 3 21:37:46 8bit kernel: [ 6.225707] usb 1-7: new full-speed USB device number 6 using xhci_hcd > Oct 3 21:37:46 8bit kernel: [ 8.259088] usb 1-7: unable to read config index 0 descriptor/start: -71 > Oct 3 21:37:46 8bit kernel: [ 8.259092] usb 1-7: can't read configurations, error -71 > Oct 3 21:37:46 8bit kernel: [ 8.424415] usb 1-7: new full-speed USB device number 7 using xhci_hcd > Oct 3 21:37:46 8bit kernel: [ 8.586659] bio: create slab <bio-1> at 1 > Oct 3 21:37:46 8bit kernel: [ 10.457602] usb 1-7: unable to read config index 0 descriptor/start: -71 > Oct 3 21:37:46 8bit kernel: [ 10.457607] usb 1-7: can't read configurations, error -71 > Oct 3 21:37:46 8bit kernel: [ 10.457625] hub 1-0:1.0: unable to enumerate USB device on port 7 The device isn't responding to the request for the device descriptors. It may be that it needs to use the "Windows" enumeration scheme. Can you test the following patch and see if it helps? http://marc.info/?l=linux-usb&m=138119329715367&w=2 At this point, I'm not even sure if the usb device 1-7 is the Elan touchscreen. It doesn't look like it from the lsusb output you provided (xHCI is on bus 2 and 3 in that output), but the bus numbers may have changed after you rebooted. But try the patch anyway, and see if it helps. Sarah Sharp -- 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
