Public bug reported:
With both the latest lowlatency kernel on 18.10 (4.18.0-10) and
previously with 4.15 on 18.04 the system is barely usable due to input
lag from the mouse and stuttering audio. This only starts a minute or
two after startup. Despite this graphics performance seems unaffected
and the CPU usage isn't abnormal. Both my mouse and audio device are USB
devices, and the dmesg log shows problems with the irq I think is
associated with the USB controller.
This issue does not exist in any mainline kernel I've tried -
4.16.0-041600-lowlatency, 4.18.0-041800-lowlatency,
4.19.0-041900-lowlatency. This suggests the issue is specific to the
Ubuntu kernel.
I've tried booting with the 'irqpoll' option but this didn't make any
difference.
ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: linux-image-4.18.0-10-lowlatency 4.18.0-10.11
ProcVersionSignature: Ubuntu 4.18.0-10.11-lowlatency 4.18.12
Uname: Linux 4.18.0-10-lowlatency x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.10-0ubuntu13
Architecture: amd64
Date: Sat Nov 3 16:14:59 2018
HibernationDevice: RESUME=UUID=5aef3b9a-9e9b-4c08-a3e1-f31df4b6e48e
InstallationDate: Installed on 2012-12-15 (2148 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release i386 (20121017.2)
MachineType: System manufacturer System Product Name
ProcEnviron:
LANGUAGE=en_GB:en
TERM=xterm-256color
PATH=(custom, no user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-10-lowlatency
root=UUID=9f8c3efb-2f3f-41f1-955f-146d48b41a16 ro quiet splash vt.handoff=1
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-4.18.0-10-lowlatency N/A
linux-backports-modules-4.18.0-10-lowlatency N/A
linux-firmware 1.175
RfKill:
SourcePackage: linux
UpgradeStatus: Upgraded to cosmic on 2018-11-01 (1 days ago)
dmi.bios.date: 03/08/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2001
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A87TD/USB3
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.:bvr2001:bd03/08/2011:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A87TD/USB3:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: To Be Filled By O.E.M.
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug cosmic
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https://bugs.launchpad.net/bugs/1801537
Title:
Mouse input lag and stuttering audio USB ('irq 18: nobody cared')
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