I upgraded my PC and did a clean Ubuntu 16.04 install, and the issue has disappeared so I've marked this bug as invalid.
** Changed in: linux (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1554371 Title: [Regression] Volume keys not working after suspend/resume Status in linux package in Ubuntu: Invalid Bug description: I have a Microsoft Sculpt Ergonomic Desktop (keyboard/mouse combo). It was working great with Ubuntu 15.10. After upgrading to 16.04, the media keys stop working after suspending and resuming. This seems to be the relevant error from Xorg.log: [ 176.121] (EE) evdev: Microsoft Microsoft® 2.4GHz Transceiver v9.0: Unable to open evdev device "/dev/input/event6". The USB receiver creates 5 devices: lrwxrwxrwx 1 root root 9 Mar 7 20:17 usb-Microsoft_Microsoft®_2.4GHz_Transceiver_v9.0-event-kbd -> ../event4 lrwxrwxrwx 1 root root 9 Mar 7 20:17 usb-Microsoft_Microsoft®_2.4GHz_Transceiver_v9.0-if01-event-mouse -> ../event5 lrwxrwxrwx 1 root root 9 Mar 7 20:17 usb-Microsoft_Microsoft®_2.4GHz_Transceiver_v9.0-if01-mouse -> ../mouse1 lrwxrwxrwx 1 root root 9 Mar 7 20:17 usb-Microsoft_Microsoft®_2.4GHz_Transceiver_v9.0-if02-event-kbd -> ../event6 lrwxrwxrwx 1 root root 6 Mar 7 20:17 usb-Microsoft_Microsoft®_2.4GHz_Transceiver_v9.0-if02-kbd -> ../js0 After suspending and resuming, the last 2 devices (event6 and js0) disappear. I have tried booting up into the Vivid and Trusty kernels, and the problem persists, so at first glance it doesn't seem to be an issue with the kernel. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-4-generic 4.4.0-4.19 ProcVersionSignature: Ubuntu 4.4.0-4.19-generic 4.4.1 Uname: Linux 4.4.0-4-generic x86_64 ApportVersion: 2.20-0ubuntu3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: furkan 2733 F.... pulseaudio /dev/snd/controlC1: furkan 2733 F.... pulseaudio CurrentDesktop: Unity Date: Mon Mar 7 20:17:56 2016 HibernationDevice: RESUME=UUID=a8eb7091-e848-4e63-82a1-8fa9562a3a61 InstallationDate: Installed on 2014-06-06 (640 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) MachineType: Gigabyte Technology Co., Ltd. GA-970A-D3 ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-4-generic root=UUID=d254b01f-2bf2-4b57-acdc-c796786f4c4c ro RelatedPackageVersions: linux-restricted-modules-4.4.0-4-generic N/A linux-backports-modules-4.4.0-4-generic N/A linux-firmware 1.156 RfKill: SourcePackage: linux UpgradeStatus: Upgraded to xenial on 2016-01-04 (63 days ago) dmi.bios.date: 05/30/2012 dmi.bios.vendor: Award Software International, Inc. dmi.bios.version: F10 dmi.board.name: GA-970A-D3 dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF10:bd05/30/2012:svnGigabyteTechnologyCo.,Ltd.:pnGA-970A-D3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-970A-D3:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr: dmi.product.name: GA-970A-D3 dmi.sys.vendor: Gigabyte Technology Co., Ltd. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1554371/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp