https://bugs.kde.org/show_bug.cgi?id=511728
Bug ID: 511728
Summary: Intense glitches when connectes to an external monitor
Classification: Plasma
Product: kwin
Version First unspecified
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 186554
--> https://bugs.kde.org/attachment.cgi?id=186554&action=edit
Video showing the bug on Fedora 43. On Arch it's exactly the same
SUMMARY
When my laptop is connected to an external monitor (both in single monitor and
in clamshell mode) various graphical glitches occur. This was tested both on
Arch Linux and on Fedora 43, both on wayland and both with open source drivers;
no proprietary nVidia drivers were involved.
Machine Specs: CPU: Intel Core i5 8300H; GPU(s): Intel Graphics 630, Nvidia
GeForce GTX 1050Ti
External monitor: Acer VG340Y; Resolution: 1920x1080; Refresh Rate: 75Hz
(though the problem persists at 60Hz). That said, the same glitch occurs with
other external displays.
I've tested serveral other desktop environments and compositors including Sway,
Gnome and Xfce and this seems to be a Plasma-specific issue.
STEPS TO REPRODUCE
A few cases where the glitch is most notable
1. Right click for the contect menu and hover over the various elements.
2. Open up the terminal and start typing.
3. Shake the cursor to enlarge it
OBSERVED RESULT
Annoying glitches as pictured in the attachments.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux [Kernel 6.17.7] / Fedora 43
KDE Plasma Version: 6.5.1 on Arch / 6.4 on Fedora
KDE Frameworks Version: 6.19 on Arch
Qt Version: 6.10
KINFO DETAILS
Block 0, Base EDID:
EDID Structure Version & Revision: 1.3
Vendor & Product Identification:
Manufacturer: ACR
Model: 1776
Serial Number: 58761330 (0x0380a072)
Made in: week 38 of 2020
Basic Display Parameters & Features:
Digital display
Maximum image size: 53 cm x 30 cm
Gamma: 2.20
DPMS levels: Off
RGB color display
Default (sRGB) color space is primary color space
First detailed timing is the preferred timing
Color Characteristics:
Red : 0.6523, 0.3369
Green: 0.3134, 0.6259
Blue : 0.1513, 0.0664
White: 0.3134, 0.3291
Established Timings I & II:
IBM : 720x400 70.081663 Hz 9:5 31.467 kHz 28.320000 MHz
DMT 0x04: 640x480 59.940476 Hz 4:3 31.469 kHz 25.175000 MHz
Apple : 640x480 66.666667 Hz 4:3 35.000 kHz 30.240000 MHz
DMT 0x05: 640x480 72.808802 Hz 4:3 37.861 kHz 31.500000 MHz
DMT 0x06: 640x480 75.000000 Hz 4:3 37.500 kHz 31.500000 MHz
DMT 0x08: 800x600 56.250000 Hz 4:3 35.156 kHz 36.000000 MHz
DMT 0x09: 800x600 60.316541 Hz 4:3 37.879 kHz 40.000000 MHz
DMT 0x0a: 800x600 72.187572 Hz 4:3 48.077 kHz 50.000000 MHz
DMT 0x0b: 800x600 75.000000 Hz 4:3 46.875 kHz 49.500000 MHz
Apple : 832x624 74.551266 Hz 4:3 49.726 kHz 57.284000 MHz
DMT 0x10: 1024x768 60.003840 Hz 4:3 48.363 kHz 65.000000 MHz
DMT 0x11: 1024x768 70.069359 Hz 4:3 56.476 kHz 75.000000 MHz
DMT 0x12: 1024x768 75.028582 Hz 4:3 60.023 kHz 78.750000 MHz
DMT 0x24: 1280x1024 75.024675 Hz 5:4 79.976 kHz 135.000000 MHz
Apple : 1152x870 75.061550 Hz 192:145 68.681 kHz 100.000000 MHz
Standard Timings:
DMT 0x15: 1152x864 75.000000 Hz 4:3 67.500 kHz 108.000000 MHz
DMT 0x20: 1280x960 60.000000 Hz 4:3 60.000 kHz 108.000000 MHz
DMT 0x23: 1280x1024 60.019740 Hz 5:4 63.981 kHz 108.000000 MHz
DMT 0x55: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 MHz
DMT 0x1c: 1280x800 59.810326 Hz 16:10 49.702 kHz 83.500000 MHz
DMT 0x2f: 1440x900 59.887445 Hz 16:10 55.935 kHz 106.500000 MHz
DMT 0x3a: 1680x1050 59.954250 Hz 16:10 65.290 kHz 146.250000 MHz
DMT 0x52: 1920x1080 60.000000 Hz 16:9 67.500 kHz 148.500000 MHz
Detailed Timing Descriptors:
DTD 1: 1920x1080 60.000000 Hz 16:9 67.500 kHz 148.500000 MHz
(527 mm x 296 mm)
Hfront 88 Hsync 44 Hback 148 Hpol P
Vfront 4 Vsync 5 Vback 36 Vpol P
Display Range Limits:
Monitor ranges (GTF): 56-76 Hz V, 30-85 kHz H, max dotclock 220 MHz
Display Product Name: 'VG240Y'
Display Product Serial Number: 'TG5EE0018524'
Extension blocks: 1
Checksum: 0x40
ADDITIONAL INFORMATION
For any additional tests and information please let me know, as I'm unsure what
else could be useful.
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