I had this problem since I upgraded in 17.04, that is the main reason for me to make a fresh reinstall. I don't remember however if I had this in 16.** series too.
I did test the mainline kernel, no change $ uname -a Linux gallion 4.12.2-041202-generic #201707150832 SMP Sat Jul 15 12:34:02 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux ** Attachment added: "dmesg-mainline.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1704614/+attachment/4916434/+files/dmesg-mainline.txt -- 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/1704614 Title: very long kernel boot time with some KVM switch Status in linux package in Ubuntu: Confirmed Bug description: I am using a Aten KVM switch CS1794 hooked on my computer. It allows the switching for USB, HDMI, and audio. http://www.aten.com/global/en/products/kvm/desktop-kvm-switches/cs1794/#.WWrnguk9iUk I run a Ubuntu 17.04 system. I experience a very long boot time, having done an analysis it appears that the main problem is the kernel boot time and more specifically the time it takes to start its USB subsystem. when you look at the dsmg output you can clearly see a gap between 4-78s and 79-91s, all in the USB sub-process. --- ApportVersion: 2.20.4-0ubuntu4.4 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: stranche 3670 F.... pulseaudio /dev/snd/controlC1: stranche 3670 F.... pulseaudio /dev/snd/controlC0: stranche 3670 F.... pulseaudio DistroRelease: Ubuntu 17.04 HibernationDevice: RESUME=UUID=28d4f703-2b20-4dd3-ba8b-aa363ad5141d InstallationDate: Installed on 2017-07-14 (2 days ago) InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412) MachineType: System manufacturer System Product Name NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia Package: linux (not installed) ProcFB: 0 EFI VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-26-generic.efi.signed root=UUID=4fde9883-6d7f-4954-90d6-779f37bbdc93 ro console=tty console=ttyUSB0,57600 noplymouth debug ProcVersionSignature: Ubuntu 4.10.0-26.30-generic 4.10.17 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-4.10.0-26-generic N/A linux-backports-modules-4.10.0-26-generic N/A linux-firmware 1.164.1 RfKill: Tags: zesty Uname: Linux 4.10.0-26-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: _MarkForUpload: True dmi.bios.date: 08/13/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 2104 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: SABERTOOTH Z77 dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev 1.xx dmi.chassis.asset.tag: Asset-1234567890 dmi.chassis.type: 3 dmi.chassis.vendor: Chassis Manufacture dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2104:bd08/13/2013:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnSABERTOOTHZ77:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion: dmi.product.name: System Product Name dmi.product.version: System Version dmi.sys.vendor: System manufacturer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1704614/+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
