Hello everyone, I’ve recently noticed an issue with my display. For some reason on Fedora I can’t enable Adaptive Sync / VRR, despite it being supported and enabled on my monitor. This happens on Fedora 44, latest kernel, both GNOME and KDE. Bazzite (with a 6.19.x kernel) also has the same issue, even in game mode. The GPU is a RX 9070 plugged in with a DisplayPort cable. I’ve also tried plugging in an AMD laptop (also with Fedora 44) with a USB-C - DisplayPort cable, the result identical.
It’s such a weird issue because it doesn’t seem to be mesa or kernel related, as I can toggle it on Arch-based distributions like SteamOS and CachyOS running similar mesa and kernel versions.
I leave here the EDID read of my monitor from the KDE settings on Fedora 44. Strangely, it seems that Adaptive Sync functionality is correctly seen.
# card1-DP-1 #######################
Block 0, Base EDID:
EDID Structure Version & Revision: 1.4
Vendor & Product Identification:
Manufacturer: SKG
Model: 10102
Serial Number: 1 (0x00000001)
Made in: week 10 of 2025
Basic Display Parameters & Features:
Digital display
Bits per primary color channel: 10
DisplayPort interface
Maximum image size: 60 cm x 33 cm
Gamma: 2.20
DPMS levels: Off
Supported color formats: RGB 4:4:4, YCrCb 4:4:4, YCrCb 4:2:2
Default (sRGB) color space is primary color space
First detailed timing includes the native pixel format and preferred refresh rate
Display supports continuous frequencies
Color Characteristics:
Red : 0.6855, 0.3056
Green: 0.2294, 0.6777
Blue : 0.1503, 0.0371
White: 0.3154, 0.3320
Established Timings I & II:
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 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 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
Standard Timings:
DMT 0x04: 640x480 66.490767 Hz 4:3 32.780 kHz 25.175000 MHz
Detailed Timing Descriptors:
DTD 1: 2560x1440 59.950550 Hz 16:9 88.787 kHz 241.500000 MHz (597 mm x 336 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 3 Vsync 5 Vback 33 Vpol P
Display Product Serial Number: '0000000000000'
Display Range Limits:
Monitor ranges (GTF): 48-180 Hz V, 70-243 kHz H, max dotclock 800 MHz
Display Product Name: 'M27T6'
Extension blocks: 2
Checksum: 0x5b