KDE delayed display update / konsole artifacts
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
mesa (Ubuntu) |
Confirmed
|
Undecided
|
Unassigned |
Bug Description
Since one of the recent Impish updates, konsole shows artifacts and reacts slowly. In fact, it looks like screen updates are pipelined on pixel-group granularity somehow, and the pipeline isn't drained completely: When more text goes to the terminal (e.g., I type something), existing artifacts vanish, but new ones (in the new text) appear.
Unfortunately, I don't see any of the previous konsole .deb releases (e.g. 4:21.08.1-1 or 4:21.08.0-1) on the Ubuntu mirrors, so I cannot go back and simply check whether the newest konsole updates are the culprit. I'm actually not sure whether konsole is responsible at all, I originally intended to file against xorg; however, I see those artifacts in neither xterm nor gnome-terminal.
Find attached a screenshot (taken with an external camera; these artifacts cannot be recorded using a screenshot tool such as imagemagick's "import") where I ran "ls" in /tmp, and cleared the terminal with ^L afterwards. The screen is still littered with remains of the "ls" output. It took a few tries to get artifacts this pronounced, though; usually they only concern small parts of the terminal.
ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: xorg 1:7.7+22ubuntu1
ProcVersionSign
Uname: Linux 5.13.0-16-generic x86_64
ApportVersion: 2.20.11-0ubuntu69
Architecture: amd64
CasperMD5CheckR
CompizPlugins: No value set for `/apps/
CompositorRunning: None
CurrentDesktop: KDE
Date: Fri Sep 24 08:09:18 2021
DistUpgraded: 2021-08-08 15:09:23,066 DEBUG Running PostInstallScript: '/usr/lib/
DistroCodename: impish
DistroVariant: ubuntu
GraphicsCard:
Intel Corporation HD Graphics 530 [8086:191b] (rev 06) (prog-if 00 [VGA controller])
Subsystem: Lenovo HD Graphics 530 [17aa:5050]
Subsystem: Lenovo GM108M [GeForce 940MX] [17aa:5050]
InstallationDate: Installed on 2016-11-26 (1762 days ago)
InstallationMedia: Kubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.1)
MachineType: LENOVO 20FXS05500
ProcKernelCmdLine: BOOT_IMAGE=
SourcePackage: xorg
UpgradeStatus: Upgraded to impish on 2021-08-08 (46 days ago)
dmi.bios.date: 10/24/2019
dmi.bios.release: 2.30
dmi.bios.vendor: LENOVO
dmi.bios.version: R07ET90W (2.30 )
dmi.board.
dmi.board.name: 20FXS05500
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.
dmi.ec.
dmi.modalias: dmi:bvnLENOVO:
dmi.product.family: ThinkPad T460p
dmi.product.name: 20FXS05500
dmi.product.sku: LENOVO_
dmi.product.
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.107-1
version.
version.
version.
version.
version.
version.
version.
summary: |
- delayed display update / konsole artifacts + KDE delayed display update / konsole artifacts |
affects: | xorg (Ubuntu) → kwin (Ubuntu) |
I went back to konsole 20.04.0 (built from upstream sources) and still see these artifacts. Consequently, something else in the xorg/KDE software stack must be responsible; I'm not sure how to proceed with debugging, though.