"And it looks like those updates are in Ubuntu-4.8.0-28:" I think not.
I do not find mention of this bug in the changelog for 4.8.0-28-generic (I searched for IO_WATCHDOG_DELAY, and USB and ohci - nothing for the latest version) and an attempted print failed exactly the same way, with a dead-in-the-water USB mouse, and with most of the USB devices no longer listed for lsusb. My usb reset script (not mine - I found it online somewhere, and modified it a bit to fit my situation) brought things back again and the syslog entries look just like before... : Nov 18 18:12:26 scott-ASUS-M2N68-AM-PLUS kernel: [ 7049.029702] ohci-pci 0000:00:02.0: HcDoneHead not written back; disabled Nov 18 18:12:26 scott-ASUS-M2N68-AM-PLUS kernel: [ 7049.029709] ohci-pci 0000:00:02.0: HC died; cleaning up Nov 18 18:12:26 scott-ASUS-M2N68-AM-PLUS kernel: [ 7049.029770] usb 2-1: USB disconnect, device number 2 Nov 18 18:12:26 scott-ASUS-M2N68-AM-PLUS kernel: [ 7049.029772] usb 2-1.1: USB disconnect, device number 5 Nov 18 18:12:26 scott-ASUS-M2N68-AM-PLUS kernel: [ 7049.072512] usb 2-1.2: USB disconnect, device number 6 Nov 18 18:12:26 scott-ASUS-M2N68-AM-PLUS acpid: input device has been disconnected, fd 10 Nov 18 18:12:26 scott-ASUS-M2N68-AM-PLUS kernel: [ 7049.174018] usb 2-1.3: USB disconnect, device number 7 Nov 18 18:12:26 scott-ASUS-M2N68-AM-PLUS kernel: [ 7049.216254] usb 2-1.4: USB disconnect, device number 8 Nov 18 18:12:26 scott-ASUS-M2N68-AM-PLUS kernel: [ 7049.217445] usb 2-2: USB disconnect, device number 3 Nov 18 18:12:26 scott-ASUS-M2N68-AM-PLUS kernel: [ 7049.259107] usb 2-3: USB disconnect, device number 4 Nov 18 18:17:01 scott-ASUS-M2N68-AM-PLUS CRON[21826]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly) Nov 18 18:17:34 scott-ASUS-M2N68-AM-PLUS kernel: [ 7357.692303] ehci-pci 0000:00:02.1: remove, state 1 Nov 18 18:17:34 scott-ASUS-M2N68-AM-PLUS kernel: [ 7357.692312] usb usb1: USB disconnect, device number 1 Nov 18 18:17:34 scott-ASUS-M2N68-AM-PLUS kernel: [ 7357.692313] usb 1-4: USB disconnect, device number 5 Nov 18 18:17:34 scott-ASUS-M2N68-AM-PLUS kernel: [ 7357.731566] usb 1-6: USB disconnect, device number 6 ------------------------------------------------------------------------------- scott@scott-ASUS-M2N68-AM-PLUS:~$ uname -a Linux scott-ASUS-M2N68-AM-PLUS 4.8.0-28-generic #30-Ubuntu SMP Fri Nov 11 14:03:52 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux scott@scott-ASUS-M2N68-AM-PLUS:~$ apt-cache policy linux-image* linux-image-extra-4.8.0-28-generic: Installed: 4.8.0-28.30 linux-image-generic: Installed: 4.8.0.28.37 linux-image-4.8.0-28-generic: Installed: 4.8.0-28.30 -- 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/1630063 Title: specific USB devices disconnect and don't reconnect Status in linux package in Ubuntu: In Progress Status in linux source package in Yakkety: In Progress Bug description: 2 USB ports randomly disconnect and don't reconnect (it's always the same two), and in dmesg all I get is " [ 1276.916458] ohci-pci 0000:00:12.0: HcDoneHead not written back; disabled [ 1276.916467] ohci-pci 0000:00:12.0: HC died; cleaning up [ 1276.916553] usb 3-1: USB disconnect, device number 2 [ 1277.017302] usb 3-2: USB disconnect, device number 3 " This only started happening when Yakkety went to the 4.8 branch, with 4.7 branch this doesn't occur, hence the bug report since it's unlikely that a hardware failure will only stick to one OS and one branch of the kernel for that OS. (these USB ports don't randomly die on Windows or BSD, I've tested that in the past couple of days) kernel version: 4.8.0.17.27 Ubuntu version Description: Ubuntu Yakkety Yak (development branch) Release: 16.10 --- ApportVersion: 2.20.3-0ubuntu7 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: c_smith 2213 F.... pulseaudio /dev/snd/controlC0: c_smith 2213 F.... pulseaudio CurrentDesktop: MATE DistroRelease: Ubuntu 16.10 HibernationDevice: RESUME=UUID=1a29baaa-55ea-4817-ba45-8c618f65ec4b InstallationDate: Installed on 2016-10-03 (0 days ago) InstallationMedia: Ubuntu-MATE 16.10 "Yakkety Yak" - Alpha amd64 (20161002) MachineType: Gigabyte Technology Co., Ltd. GA-78LMT-S2 NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia Package: linux (not installed) ProcFB: 0 VESA VGA ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.8.0-17-generic root=/dev/mapper/Linux-root ro nomodeset quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 4.8.0-17.19-generic 4.8.0-rc7 RelatedPackageVersions: linux-restricted-modules-4.8.0-17-generic N/A linux-backports-modules-4.8.0-17-generic N/A linux-firmware 1.161 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no Tags: yakkety Uname: Linux 4.8.0-17-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 01/09/2014 dmi.bios.vendor: Award Software International, Inc. dmi.bios.version: F6 dmi.board.name: GA-78LMT-S2 dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF6:bd01/09/2014:svnGigabyteTechnologyCo.,Ltd.:pnGA-78LMT-S2:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-78LMT-S2:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr: dmi.product.name: GA-78LMT-S2 dmi.sys.vendor: Gigabyte Technology Co., Ltd. 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