** No longer affects: linux (Ubuntu Cosmic) ** Description changed:
+ == 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 + In short 4.13-41 doesn't have the problem 4.13-43 has the laggy problem - --- + --- ApportVersion: 2.20.1-0ubuntu2.17 Architecture: amd64 AudioDevicesInUse: - USER PID ACCESS COMMAND - /dev/snd/controlC0: james 2835 F.... pulseaudio + 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 + 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 + 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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1773520 Title: After update to 4.13-43 Intel Graphics are Laggy To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1773520/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
