Ok I was able to reproduce it. The tearing happens, because (quote)
"rotation is handled by doing a blit in the server which isn't
synchronised to anything."
The 'modesetting' driver should gain support for 'TearFree', but that's
unlikely to happen anymore because everyone has mostly moved to Wayland
already.
** Package changed: linux (Ubuntu) => xorg-server (Ubuntu)
** Changed in: xorg-server (Ubuntu)
Status: Confirmed => Won't Fix
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https://bugs.launchpad.net/bugs/1928507
Title:
Screen tearing for video playback is observed after screen is rotated
180 degree in Ubuntu 20.04, Gnome Vanilla, X11
Status in xorg-server package in Ubuntu:
Won't Fix
Bug description:
Screen tearing for video playback is observed after screen is rotated 180
degree in Ubuntu 20.04, Gnome Vanilla, X11. We haven't seen the issue in
Wayland.
Here are the steps to reproduce the issue.
1) Install Ubuntu 20.04.
2) Play video on ubuntu 20.04.
3) Turn on 'auto rotation" in setting to rotate the screen; Or use 'xrandr -o
2' to rotate the screen.
4) Screen tearing is observed for 100% reproducible after rotation.
5) It is happening on all of video contents with dynamic scene changing.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.17
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: ubuntu 1327 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2021-05-14 (0 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: Intel Corporation Tiger Lake Client Platform
Package: linux (not installed)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-53-generic
root=UUID=a44b834c-d346-4f9c-aa08-ed4716d2ec2c ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.8.0-53.60~20.04.1-generic 5.8.18
RelatedPackageVersions:
linux-restricted-modules-5.8.0-53-generic N/A
linux-backports-modules-5.8.0-53-generic N/A
linux-firmware 1.187.12
Tags: focal
Uname: Linux 5.8.0-53-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 03/17/2021
dmi.bios.vendor: Intel Corporation
dmi.bios.version: TGLSFWI1.R00.4092.E68.2103171123
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: TigerLake U DDR4 SODIMM RVP
dmi.board.vendor: Intel Corporation
dmi.board.version: 1
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: Intel Corporation
dmi.chassis.version: 0.1
dmi.ec.firmware.release: 1.35
dmi.modalias:
dmi:bvnIntelCorporation:bvrTGLSFWI1.R00.4092.E68.2103171123:bd03/17/2021:efr1.35:svnIntelCorporation:pnTigerLakeClientPlatform:pvr0.1:rvnIntelCorporation:rnTigerLakeUDDR4SODIMMRVP:rvr1:cvnIntelCorporation:ct9:cvr0.1:
dmi.product.family: Tiger Lake Client System
dmi.product.name: Tiger Lake Client Platform
dmi.product.sku: 0001100100010000
dmi.product.version: 0.1
dmi.sys.vendor: Intel Corporation
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