Public bug reported: It appears that ever since kernel ~4.14, there was a bug in i915 DRM that caused the internal laptop displays connected by eDP to default to 40 Hz screen refresh rate.
Affected Ubuntu release: 18.04 Kernel package version: 4.15.0-22.24 What you expected to happen: The refresh rate has a sane default setting What happened instead: The refresh rate defaults to 40 Hz Upstream bug report: https://bugs.freedesktop.org/show_bug.cgi?id=103497 This has already been fixed in drm-tip: https://cgit.freedesktop.org/drm-tip/commit/?id=d93fa1b47b8fcd149b5091f18385304f402a8e15 I do confirm that the latest daily build cod/tip/drm-tip/2018-06-03 (8fdb62e0511e81fa935059c274a2457361fdb679) of drm-tip kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-tip/current/ indeed fixes this issue for me. Known workarounds: The user can force the display to use other refresh rates close to 60 Hz (59,96 works quite well in my case) ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-22-generic 4.15.0-22.24 Uname: Linux 4.17.0-994-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.1 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Sun Jun 3 16:53:20 2018 InstallationDate: Installed on 2018-06-03 (0 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=pl_PL.UTF-8 SHELL=/bin/bash SourcePackage: linux-signed UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: linux-signed (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug bionic ** Description changed: It appears that ever since kernel ~4.14, there was a bug in i915 DRM that caused the internal laptop displays connected by eDP to default to 40 Hz screen refresh rate. Affected Ubuntu release: 18.04 Kernel package version: 4.15.0-22.24 What you expected to happen: The refresh rate has a sane default setting What happened instead: The refresh rate defaults to 40 Hz Upstream bug report: https://bugs.freedesktop.org/show_bug.cgi?id=103497 This has already been fixed in drm-tip: https://cgit.freedesktop.org/drm-tip/commit/?id=d93fa1b47b8fcd149b5091f18385304f402a8e15 I do confirm that the latest daily build cod/tip/drm-tip/2018-06-03 (8fdb62e0511e81fa935059c274a2457361fdb679) of drm-tip kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-tip/current/ indeed fixes this issue for me. - Known workarounds: The user can force the display other refresh rates - close to 60 Hz (59,96 works quite well in my case) + Known workarounds: The user can force the display to use other refresh + rates close to 60 Hz (59,96 works quite well in my case) ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-22-generic 4.15.0-22.24 Uname: Linux 4.17.0-994-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.1 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Sun Jun 3 16:53:20 2018 InstallationDate: Installed on 2018-06-03 (0 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) ProcEnviron: - TERM=xterm-256color - PATH=(custom, no user) - XDG_RUNTIME_DIR=<set> - LANG=pl_PL.UTF-8 - SHELL=/bin/bash + TERM=xterm-256color + PATH=(custom, no user) + XDG_RUNTIME_DIR=<set> + LANG=pl_PL.UTF-8 + SHELL=/bin/bash SourcePackage: linux-signed UpgradeStatus: No upgrade log present (probably fresh install) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1774875 Title: Internal laptop display defaults to low refresh rate To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed/+bug/1774875/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
