Starting from 4.14 and continuing in 4.15 I observe 2 bugs that I think are related and didn't exist in 4.13. The first would be more difficult to reproduce: USB sound card Creative SB Omni Surround 5.1 after system boot only shows 2.0 stereo output option, while it also supports 5.1 and PulseAudio configured accordingly. If unplug and plug it back in, 5.1 mode appears and I can select between 2.0 and 5.1. You can boot with stock Ubuntu 17.10 and 18.04 as of right now and the first one will work properly and second one will have mentioned bug. Second bug is easier to reproduce: when connecting Nexus 6P via USB cable, it appears in file manager device list (Nemo, Nautilus, etc.), but when it is unplugged it doesn't disappear when running kernels 4.14 and 4.15. I have 7 Nexus 6P entries already, unplugging and plugging back looks like this: [200038.821988] usb 3-1: new high-speed USB device number 4 using xhci_hcd [200039.043611] usb 3-1: New USB device found, idVendor=18d1, idProduct=4ee1 [200039.043612] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [200039.043614] usb 3-1: Product: Nexus 6P [200039.043614] usb 3-1: Manufacturer: Huawei [200039.043615] usb 3-1: SerialNumber: 8XV7N16128000093 [202243.949672] usb 3-1: USB disconnect, device number 4 [205549.671959] usb 3-1: new high-speed USB device number 5 using xhci_hcd [205549.893327] usb 3-1: New USB device found, idVendor=18d1, idProduct=4ee1 [205549.893328] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [205549.893329] usb 3-1: Product: Nexus 6P [205549.893329] usb 3-1: Manufacturer: Huawei [205549.893330] usb 3-1: SerialNumber: 8XV7N16128000093 [205550.602646] usb 3-1: USB disconnect, device number 5 [205553.456007] usb 3-1: new high-speed USB device number 6 using xhci_hcd [205553.680392] usb 3-1: New USB device found, idVendor=18d1, idProduct=4ee1 [205553.680394] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [205553.680394] usb 3-1: Product: Nexus 6P [205553.680395] usb 3-1: Manufacturer: Huawei [205553.680396] usb 3-1: SerialNumber: 8XV7N16128000093 [206021.635511] usb 3-1: USB disconnect, device number 6 [206024.169853] usb 3-1: new high-speed USB device number 7 using xhci_hcd [206024.392921] usb 3-1: New USB device found, idVendor=18d1, idProduct=4ee1 [206024.392923] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [206024.392924] usb 3-1: Product: Nexus 6P [206024.392925] usb 3-1: Manufacturer: Huawei [206024.392925] usb 3-1: SerialNumber: 8XV7N16128000093 [206034.058208] usb 3-1: USB disconnect, device number 7 [206036.914005] usb 3-1: new high-speed USB device number 8 using xhci_hcd [206037.136891] usb 3-1: New USB device found, idVendor=18d1, idProduct=4ee1 [206037.136893] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [206037.136894] usb 3-1: Product: Nexus 6P [206037.136895] usb 3-1: Manufacturer: Huawei [206037.136895] usb 3-1: SerialNumber: 8XV7N16128000093 [206080.923547] usb 3-1: USB disconnect, device number 8 [206083.526585] usb 3-1: new high-speed USB device number 9 using xhci_hcd [206083.752601] usb 3-1: New USB device found, idVendor=18d1, idProduct=4ee1 [206083.752602] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [206083.752603] usb 3-1: Product: Nexus 6P [206083.752604] usb 3-1: Manufacturer: Huawei [206083.752605] usb 3-1: SerialNumber: 8XV7N16128000093 These 2 issues appeared at the same time, so I think they are related. Let me know if you can't reproduce them and need any additional information.
On Mon, Feb 12, 2018 at 03:53:07AM +0000, bugzilla-daemon@bugzilla.kernel.org wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=198757 > > Bug ID: 198757 > Summary: USB regression for Android phone and sound card All USB bugs should be sent to the linux-usb@vger.kernel.org mailing list, and not entered into bugzilla. Please bring this issue up there, if it is still a problem in the latest kernel release.
OK, will do