1002:68a0 After suspend-resume graphics are sluggish and input lags with displayport connected
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Triaged
|
Medium
|
Unassigned |
Bug Description
After resuming from suspend-to-ram, graphics on displayport connected Dell U2415 monitor are sluggish and input has lag.
Examples:
- transition from unity greeter login locked status to unlocked status: 6 seconds (normal 1 second)
- transition from clicking dash and getting window: 2-3 seconds (normal <1 second)
- starting gedit: 4 seconds (normal <1 second)
- mouse lags, sometimes the pointer is still on the left side of the screen, while it should be on the right
- input from keyboard lags, about 1-2 seconds (normal no lag)
When unplugging the Displayport cable all lag is gone.
When plugging displayport back in again lag is back, same as before.
After a reboot, response of graphics and input is normal. So two options to get rid of the lag: unplug DP or reboot.
Further investigation:
Did a mainline kernel bisect:
From 3.13.11-ckt27 (good) to v4.3-wily (bad)
First bad is v4.0-rc1-vivid
Did a kernel commit bisect:
From 3.19 (good) to 4.0-rc1 (bad)
first bad commit: [e55bca26188e45
Commit bisect log is attached
WORKAROUND: radeon.audio=0
However, I'm not able to use audio over Displayport.
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-
ProcVersionSign
Uname: Linux 4.2.0-18-generic x86_64
ApportVersion: 2.19.1-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
/dev/snd/
CurrentDesktop: Unity
Date: Thu Nov 12 22:08:27 2015
HibernationDevice: RESUME=
InstallationDate: Installed on 2015-10-31 (12 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: Hewlett-Packard HP EliteBook 8740w
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.149.1
SourcePackage: linux
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/07/2014
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68CAD Ver. F.50
dmi.board.name: 1520
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 33.31
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-
dmi.product.name: HP EliteBook 8740w
dmi.sys.vendor: Hewlett-Packard
tags: | added: latest-bios-f.50 |
Added commit bisect log