** Changed in: linux (Ubuntu)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1773520
Title:
After update to 4.13-43 Intel Graphics are Laggy
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Artful:
Fix Committed
Status in linux source package in Bionic:
Fix Committed
Bug description:
== SRU Justification ==
The bug reporter states that after update to Kernel 4.13-43 the intel
graphics seem to really lag - especially noticeable in apps which are
using vsync, which, at least on his system, locks to 40fps unlike the
previous kernel.
See https://askubuntu.com/questions/1039189/today-i-got-an-update-and-
graphics-are-not-working-right-on-ubuntu-16-04/1040545#1040545 for
some other users with the same issue
This regression was introduced by upstream commit dc911f5bd8aa. A
revert of this commit fixes this bug. Upstream has already reverted
this commit in drm-tip tree and cc'd it to upstream stable. However,
the revert has not landed in mainline or stable yet, so it is being sent
as a SAUCE patch.
The revert is also needed in Bionic. However, the Bionic revert is
slightly differant, so it will be SRU'd separately.
== Fix ==
UBUNTU: SAUCE: Revert "drm/i915/edp: Allow alternate fixed mode for eDP if
available."
== Regression Potential ==
Low. This revert is to fix a current regression.
== Test Case ==
A test kernel was built with this patch and tested by the original bug
reporter.
The bug reporter states the test kernel resolved the bug.
After update to Kernel 4.13-43 the intel graphics seem to really lag -
especially noticeable in apps which are using vsync, which, at least
on my system, locks to 40fps unlike the previous kernel I have
installed (4.13-41) which locks at a steady 60fps.
See https://askubuntu.com/questions/1039189/today-i-got-an-update-and-
graphics-are-not-working-right-on-ubuntu-16-04/1040545#1040545 for
some other users with the same issue
In short
4.13-41 doesn't have the problem
4.13-43 has the laggy problem
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ApportVersion: 2.20.1-0ubuntu2.17
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: james 2835 F.... pulseaudio
CurrentDesktop: GNOME
DistroRelease: Ubuntu 16.04
HibernationDevice: RESUME=UUID=ac1331a0-15f2-4832-aebc-48e3ad655add
InstallationDate: Installed on 2016-05-31 (724 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64
(20160420.1)
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 8087:0a2a Intel Corp.
Bus 001 Device 002: ID 04f2:b50d Chicony Electronics Co., Ltd
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: HP HP Pavilion Gaming Notebook
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-43-generic
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.13.0-43.48~16.04.1-generic 4.13.16
RelatedPackageVersions:
linux-restricted-modules-4.13.0-43-generic N/A
linux-backports-modules-4.13.0-43-generic N/A
linux-firmware 1.157.18
Tags: xenial
Uname: Linux 4.13.0-43-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm audio cdrom dip docker libvirtd lpadmin plugdev sambashare
sudo video
_MarkForUpload: True
dmi.bios.date: 09/16/2015
dmi.bios.vendor: Insyde
dmi.bios.version: F.53
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 80A9
dmi.board.vendor: HP
dmi.board.version: 91.18
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.modalias:
dmi:bvnInsyde:bvrF.53:bd09/16/2015:svnHP:pnHPPavilionGamingNotebook:pvrType1ProductConfigId:rvnHP:rn80A9:rvr91.18:cvnHP:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV G=N L=CON B=HP S=PAV X=Null
dmi.product.name: HP Pavilion Gaming Notebook
dmi.product.version: Type1ProductConfigId
dmi.sys.vendor: HP
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