Thanks for the bug report. I think this is related to a family of scaling bugs in gnome-shell I've only discovered recently:
https://gitlab.gnome.org/GNOME/mutter/merge_requests/1004 https://gitlab.gnome.org/GNOME/mutter/issues/849 Those are not this bug, but I think it's related whereby display scaling is confusing mutter/gnome-shell into creating textures of the wrong size. ** Bug watch added: gitlab.gnome.org/GNOME/mutter/issues #849 https://gitlab.gnome.org/GNOME/mutter/issues/849 ** Package changed: xorg (Ubuntu) => mutter (Ubuntu) ** Summary changed: - xorg resizes framebuffer when playing fullscreen video over and over again + Gnome resizes framebuffer when playing fullscreen video over and over again -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1862081 Title: Gnome resizes framebuffer when playing fullscreen video over and over again Status in mutter package in Ubuntu: New Bug description: When I play a video with mpv (or e.g. Firefox), it works just fine. When this video is fullscreened (e.g. in mpv by pressing f), the screen quickly turns off, and switches resolution modes in such a rate the screen is unusable. The native resolution of the screen is 1440p, but Xorg somehow increases the size to 3424x1926 for the fullscreen, then quickly switches back to 1440p, before increasing it again. As soon as the video is de-fullscreened (by pressing f again in mpv, or esc in Firefox), the funny resolution switching stops and the system is usable again. This also happens with the modesetting 2d-driver. This does not happen with Wayland. This can be seen in the Xorg-log: [ 20.215] (II) intel(0): EDID vendor "JDI", prod id 0 [ 20.215] (II) intel(0): Printing DDC gathered Modelines: [ 20.215] (II) intel(0): Modeline "2560x1440"x0.0 245.12 2560 2608 2640 2720 1440 1443 1449 1502 +hsync -vsync (90.1 kHz eP) [ 258.869] (II) intel(0): resizing framebuffer to 3424x1926 [ 258.905] (II) intel(0): switch to mode 2560x1440@60.0 on eDP1 using pipe 0, position (0, 0), rotation normal, reflection none [ 268.955] (II) intel(0): resizing framebuffer to 2560x1440 [ 269.097] (II) intel(0): switch to mode 2560x1440@60.0 on eDP1 using pipe 0, position (0, 0), rotation normal, reflection none [ 270.383] (II) intel(0): resizing framebuffer to 3424x1926 [ 270.400] (II) intel(0): switch to mode 2560x1440@60.0 on eDP1 using pipe 0, position (0, 0), rotation normal, reflection none [ 271.852] (II) intel(0): resizing framebuffer to 2560x1440 [ 271.858] (II) intel(0): switch to mode 2560x1440@60.0 on eDP1 using pipe 0, position (0, 0), rotation normal, reflection none [ 273.294] (II) intel(0): resizing framebuffer to 3424x1926 [ 273.314] (II) intel(0): switch to mode 2560x1440@60.0 on eDP1 using pipe 0, position (0, 0), rotation normal, reflection none When the resolution is increased, the Kernel complains about the framebuffer size: [ 269.830034] [drm] Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: xorg 1:7.7+19ubuntu13 ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8 Uname: Linux 5.4.0-12-generic x86_64 ApportVersion: 2.20.11-0ubuntu16 Architecture: amd64 BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log' CompositorRunning: None CurrentDesktop: ubuntu:GNOME Date: Thu Feb 6 00:00:07 2020 DistUpgraded: 2020-02-05 22:21:13,002 DEBUG Running PostInstallScript: './xorg_fix_proprietary.py' DistroCodename: focal DistroVariant: ubuntu DpkgLog: ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation UHD Graphics 620 [8086:5917] (rev 07) (prog-if 00 [VGA controller]) Subsystem: Lenovo UHD Graphics 620 [17aa:2259] MachineType: LENOVO 20LES01W00 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-12-generic root=/dev/mapper/hostname-ubunturoot ro quiet splash vt.handoff=7 SourcePackage: xorg UpgradeStatus: Upgraded to focal on 2020-02-05 (0 days ago) dmi.bios.date: 11/27/2019 dmi.bios.vendor: LENOVO dmi.bios.version: N25ET52W (1.38 ) dmi.board.asset.tag: Not Available dmi.board.name: 20LES01W00 dmi.board.vendor: LENOVO dmi.board.version: Not Defined dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 31 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.modalias: dmi:bvnLENOVO:bvrN25ET52W(1.38):bd11/27/2019:svnLENOVO:pn20LES01W00:pvrThinkPadX1Yoga3rd:rvnLENOVO:rn20LES01W00:rvrNotDefined:cvnLENOVO:ct31:cvrNone: dmi.product.family: ThinkPad X1 Yoga 3rd dmi.product.name: 20LES01W00 dmi.product.sku: LENOVO_MT_20LE_BU_Think_FM_ThinkPad X1 Yoga 3rd dmi.product.version: ThinkPad X1 Yoga 3rd dmi.sys.vendor: LENOVO version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.100-4 version.libgl1-mesa-dri: libgl1-mesa-dri 19.3.3-1ubuntu1 version.libgl1-mesa-glx: libgl1-mesa-glx N/A version.xserver-xorg-core: xserver-xorg-core 2:1.20.7-2ubuntu1 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20190815-1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1862081/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
