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
I booted with 'debug' in linux line in grub and issued a 'journalctl -ab' command