| Summary: | Incorrectly detected external screen refresh rate after upgrade to 6.4.2 | ||
|---|---|---|---|
| Product: | [Plasma] kwin | Reporter: | elman <elman> |
| Component: | general | Assignee: | KWin default assignee <kwin-bugs-null> |
| Status: | RESOLVED UPSTREAM | ||
| Severity: | normal | CC: | kdedev, nate, xaver.hugl |
| Priority: | NOR | Keywords: | regression |
| Version First Reported In: | 6.4.2 | ||
| Target Milestone: | --- | ||
| Platform: | Arch Linux | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed In: | ||
| Sentry Crash Report: | |||
|
Description
elman
2025-07-06 23:21:42 UTC
It seems that issue was with refresh rate of my secondary screen. It is 75 Hz screen and before Plasma 6.4.2 it was correctly detected. However, Plasma 6.4.2 reported it's 100 Hz screen and set that refresh rate which caused reboots and freezes. After I set 75 Hz, everything was OK.
Here's EDID of given screen:
# card0-HDMI-A-1 #######################
Block 0, Base EDID:
EDID Structure Version & Revision: 1.3
Vendor & Product Identification:
Manufacturer: AUS
Model: 9285
Serial Number: <removed>
Made in: week 51 of 2022
Basic Display Parameters & Features:
Digital display
Maximum image size: 53 cm x 30 cm
Gamma: 2.20
DPMS levels: Off
RGB color display
First detailed timing is the preferred timing
Color Characteristics:
Red : 0.6503, 0.3281
Green: 0.3115, 0.6191
Blue : 0.1513, 0.0468
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 0x55: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 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 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 0x15: 1152x864 75.000000 Hz 4:3 67.500 kHz 108.000000 MHz
DMT 0x1c: 1280x800 59.810326 Hz 16:10 49.702 kHz 83.500000 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): 48-100 Hz V, 30-120 kHz H, max dotclock 340 MHz
Display Product Name: 'VA24EHF'
Display Product Serial Number: '<removed>'
Extension blocks: 1
Checksum: 0xa3
----------------
Block 1, CTA-861 Extension Block:
Revision: 3
Underscans IT Video Formats by default
Supports YCbCr 4:4:4
Supports YCbCr 4:2:2
Native detailed modes: 1
Video Data Block:
VIC 1: 640x480 59.940476 Hz 4:3 31.469 kHz 25.175000 MHz
VIC 3: 720x480 59.940060 Hz 16:9 31.469 kHz 27.000000 MHz
VIC 2: 720x480 59.940060 Hz 4:3 31.469 kHz 27.000000 MHz
VIC 4: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 MHz
VIC 18: 720x576 50.000000 Hz 16:9 31.250 kHz 27.000000 MHz
VIC 17: 720x576 50.000000 Hz 4:3 31.250 kHz 27.000000 MHz
VIC 19: 1280x720 50.000000 Hz 16:9 37.500 kHz 74.250000 MHz
VIC 16: 1920x1080 60.000000 Hz 16:9 67.500 kHz 148.500000 MHz (native)
VIC 31: 1920x1080 50.000000 Hz 16:9 56.250 kHz 148.500000 MHz
Video Capability Data Block:
YCbCr quantization: Selectable (via AVI YQ)
RGB quantization: Selectable (via AVI Q)
PT scan behavior: Always Underscanned
IT scan behavior: Always Underscanned
CE scan behavior: Always Underscanned
Detailed Timing Descriptors:
DTD 2: 1366x768 59.789541 Hz 683:384 47.712 kHz 85.500000 MHz (527 mm x 296 mm)
Hfront 70 Hsync 143 Hback 213 Hpol P
Vfront 3 Vsync 3 Vback 24 Vpol P
DTD 3: 1280x768 59.870228 Hz 5:3 47.776 kHz 79.500000 MHz (527 mm x 296 mm)
Hfront 64 Hsync 128 Hback 192 Hpol N
Vfront 3 Vsync 7 Vback 20 Vpol P
DTD 4: 1920x1080 100.047246 Hz 16:9 109.952 kHz 228.700000 MHz (527 mm x 296 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 3 Vsync 5 Vback 11 Vpol P
DTD 5: 1920x1080 74.972503 Hz 16:9 83.894 kHz 174.500000 MHz (527 mm x 296 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 3 Vsync 5 Vback 31 Vpol N
Checksum: 0xb4
----------------
EDID conformity: PASS
Setting to kwin (In reply to elman from comment #1) > It seems that issue was with refresh rate of my secondary screen. It is 75 > Hz screen and before Plasma 6.4.2 it was correctly detected. However, Plasma > 6.4.2 reported it's 100 Hz screen and set that refresh rate which caused > reboots and freezes. KWin doesn't decide on available refresh rates, the kernel driver does. Also, the EDID actually says it's a 100Hz screen. > 1920x1080 100.047246 Hz Either way, the freeze and random reboots are definitely something in the kernel driver, so please report it at https://forums.developer.nvidia.com/c/gpu-graphics/linux Interesting. Thank you for investigating. |