I used to work under GNOME from Fedora 28 to 36. However, Gnome Wayland does not support my external display with 2560x1440 @ 60 Hz or 78 Hz. In order for the resolution to work, I have to use Xorg, but add refresh rate of 39 Hz to work with xrandr. Recently, out of curiosity, I tried with KDE plasma, and found Plasma Wayland support 2560x1440 at refresh rate of 60 Hz without any configurations. I have to wonder what’s the magic of KDE Plasma Wayland that makes the resolution work, but not Gnome Wayland? The funny thing is if I log out KDE session (not reboot), and log into Gnome Wayland session, the 2560x1440 can work at 60 Hz. Anyone can explain why?
That’s very odd. I haven’t seen that behavior with my 1440p monitor. It should be based on the EDID that your monitor reports. Can you share the output of xrandrfrom the differing environments?
Thanks for your reply. Below is the output of xrandr:
Screen 0: minimum 320 x 200, current 4480 x 1440, maximum 16384 x 16384
eDP-1 connected 1920x1080+2560+0 (normal left inverted right x axis y axis) 381mm x 214mm
1920x1080 60.05*+ 60.01 59.97 59.96 59.93
1680x1050 59.95 59.88
1400x1050 59.98
1600x900 59.99 59.94 59.95 59.82
1280x1024 60.02
1400x900 59.96 59.88
1280x960 60.00
1440x810 60.00 59.97
1368x768 59.88 59.85
1280x800 59.99 59.97 59.81 59.91
1280x720 60.00 59.99 59.86 59.74
1024x768 60.04 60.00
960x720 60.00
928x696 60.05
896x672 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
960x540 59.96 59.99 59.63 59.82
800x600 60.00 60.32 56.25
840x525 60.01 59.88
864x486 59.92 59.57
700x525 59.98
800x450 59.95 59.82
640x512 60.02
700x450 59.96 59.88
640x480 60.00 59.94
720x405 59.51 58.99
684x384 59.88 59.85
640x400 59.88 59.98
640x360 59.86 59.83 59.84 59.32
512x384 60.00
512x288 60.00 59.92
480x270 59.63 59.82
400x300 60.32 56.34
432x243 59.92 59.57
320x240 60.05
360x202 59.51 59.13
320x180 59.84 59.32
DP-1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 698mm x 393mm
2560x1440 74.78 + 59.95*
2560x1440_40.00 39.96
1920x1440 75.00 60.00
1856x1392 75.00 60.00
1792x1344 75.00 60.00
2048x1152 60.00
1920x1200 74.93 59.95
1920x1080 60.00 50.00 59.94
1920x1080i 60.00 50.00 59.94
1600x1200 75.00 70.00 65.00 60.00
1680x1050 74.89 59.88
1680x945 60.02
1400x1050 74.87 59.95
1600x900 60.00
1280x1024 75.02 60.02
1440x900 74.98 59.90
1280x960 60.00
1366x768 59.79
1360x768 60.02
1280x800 74.93 59.91
1152x864 75.00
1280x768 74.89 59.99
1280x720 60.00 50.00 59.94
1024x768 75.03 70.07 60.00
1024x576 59.97
800x600 72.19 75.00 60.32 56.25
720x576 50.00
848x480 60.00
720x480 60.00 59.94
640x480 75.00 72.81 60.00 59.94
DP-2 disconnected (normal left inverted right x axis y axis)This is obtained after I logout KDE and login xorg session.
Now I logout the previous xorg session, and login to gnome Wayland session, I got this:
Screen 0: minimum 16 x 16, current 4480 x 1440, maximum 32767 x 32767
XWAYLAND0 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 700mm x 390mm
2560x1440 59.91*+
1920x1440 59.90
1600x1200 59.87
1440x1080 59.87
1400x1050 59.86
1280x1024 59.76
1280x960 59.94
1152x864 59.78
1024x768 59.68
800x600 59.86
640x480 59.38
320x240 59.52
1920x1200 59.88
1680x1050 59.85
1440x900 59.89
1280x800 59.81
720x480 59.71
640x400 59.20
320x200 58.96
2048x1152 59.90
1920x1080 59.88
1600x900 59.82
1368x768 59.88
1280x720 59.86
1024x576 59.90
864x486 59.45
720x400 59.55
640x350 59.77
XWAYLAND1 connected 1920x1080+2560+0 (normal left inverted right x axis y axis) 380mm x 210mm
1920x1080 59.96*+
1440x1080 59.99
1400x1050 59.98
1280x1024 59.89
1280x960 59.94
1152x864 59.96
1024x768 59.92
800x600 59.86
640x480 59.38
320x240 59.52
1680x1050 59.95
1440x900 60.03
1280x800 59.99
720x480 59.71
640x400 59.95
320x200 58.96
1600x900 59.95
1368x768 59.88
1280x720 59.86
1024x576 59.90
864x486 59.92
720x400 59.55
640x350 59.77Now, I rebooted and directly login to Gnome Wayland session, the external monitor does not receive signal under 2560x1440@59.9 Hz from the previous session. The output of xrandr:
XWAYLAND0 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 700mm x 390mm
2560x1440 59.91*+
1920x1440 59.90
1600x1200 59.87
1440x1080 59.87
1400x1050 59.86
1280x1024 59.76
1280x960 59.94
1152x864 59.78
1024x768 59.68
800x600 59.86
640x480 59.38
320x240 59.52
1920x1200 59.88
1680x1050 59.85
1440x900 59.89
1280x800 59.81
720x480 59.71
640x400 59.20
320x200 58.96
2048x1152 59.90
1920x1080 59.88
1600x900 59.82
1368x768 59.88
1280x720 59.86
1024x576 59.90
864x486 59.45
720x400 59.55
640x350 59.77
XWAYLAND1 connected primary 1920x1080+2560+0 (normal left inverted right x axis y axis) 380mm x 210mm
1920x1080 59.96*+
1440x1080 59.99
1400x1050 59.98
1280x1024 59.89
1280x960 59.94
1152x864 59.96
1024x768 59.92
800x600 59.86
640x480 59.38
320x240 59.52
1680x1050 59.95
1440x900 60.03
1280x800 59.99
720x480 59.71
640x400 59.95
320x200 58.96
1600x900 59.95
1368x768 59.88
1280x720 59.86
1024x576 59.90
864x486 59.92
720x400 59.55
640x350 59.77Now I logout the gnome Wayland session, and log back in to KDE Wayland session, I got this:
XWAYLAND0 connected 1920x1080+2560+0 (normal left inverted right x axis y axis) 380mm x 210mm
1920x1080 59.96*+
1440x1080 59.99
1400x1050 59.98
1280x1024 59.89
1280x960 59.94
1152x864 59.96
1024x768 59.92
800x600 59.86
640x480 59.38
320x240 59.52
1680x1050 59.95
1440x900 60.03
1280x800 59.99
720x480 59.71
640x400 59.95
320x200 58.96
1600x900 59.95
1368x768 59.88
1280x720 59.86
1024x576 59.90
864x486 59.92
720x400 59.55
640x350 59.77
XWAYLAND1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 700mm x 390mm
2560x1440 59.91*+
1920x1440 59.90
1600x1200 59.87
1440x1080 59.87
1400x1050 59.86
1280x1024 59.89
1280x960 59.94
1152x864 59.78
1024x768 59.68
800x600 59.86
640x480 59.38
320x240 59.52
1920x1200 59.88
1680x1050 59.85
1440x900 59.89
1280x800 59.81
720x480 59.71
640x400 59.20
320x200 58.96
2048x1152 59.90
1920x1080 59.88
1600x900 59.82
1368x768 59.88
1280x720 59.86
1024x576 59.90
864x486 59.45
720x400 59.55
640x350 59.77The odd thing I see is that the the monitors appear to support the same resolutions overall but are showing up in different order between the two. Sometimes the 1080p is listed first and other times the 1440p is listed first.
Sorry for the edits. I see
DP-1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 698mm x 393mm
2560x1440 74.78 + 59.95*
in your first one with Xorg, so it seems Xorg detects a 75fps option where Wayland only detects a 60fps option. It seems this has more to do with Xorg vs Wayland than the desktop environment. If it works over 75fps with Xorg, then it’s a bug in Wayland, as far as I can tell.
In the display settings for KDE, both 75 Hz and 59.95 Hz refresh rates are shown (detected?), but only works with 59.95 Hz. If I select 75 Hz, the external monitor shows no signal.
If I log out of KDE and log back into gnome Wayland, 59.95 Hz also works, but not if you directly boost into gnome Wayland. Sounds to me that if I boost into gnome Wayland, some packages related to deal with 59.96 hz, otherwise started in KDE, not started, or ignored. If we can find this missing piece, I could directly boost into gnome Wayland session that supports 2560x1440 @59.95 Hz.
Right now, if I directly boost into gnome Wayland, I have to reduce the resolution to 2048x1152 @59.95 Hz for the external monitor to work.
It seems Wayland is reporting your actual sane capabilities and Xorg is also presenting theoretical capabilities, so neither is technically wrong in that case.
Here’s where this is going to get annoying. I’ve had displays that only got certain framerates over specific connectors (DisplayPort, HDMI, DVI, etc.), and cases where a monitor that otherwise might get a higher resolution over HDMI didn’t if the USB-C dock used DisplayPort internally. Additionally, some BIOS have a toggle where you can trade off more monitors for lower resolution support, especially if via USB-C/Thunderbolt. All of this is a terrible modern, mess, but since this is detected as DisplayPort now, try HDMI instead and if this is an HDMI cable, it might be going over a DP connection on the dock or internally, so try a DisplayPort cable instead, if that’s the case.
In fact, I connect the external monitor with HDMI cable. But I don’t know why it shows Display Port (DP-1). Under the same kernel, it works well under KDE Wayland, not gnome Wayland.
Unfortunately, many boards now have an HDMI port that is actually a DisplayPort on board and this can cause all sorts of weird issues. Do you have a DisplayPort port and cable that you could try instead?
No, I only have HDMI port on my computer. So far, I can live with KDE plasma. At my level, I don’t see any difference from Gnome Wayland, except for workflow.
After last update to the new kernel (inux fedora 5.19.4-200.fc36.x86_64 #1 SMP PREEMPT_DYNAMIC Thu Aug 25 17:42:04 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux), I can use 2560x1440 @59.95 Hz after directly login to Gnome Wayland. I further tried with 78 Hz, it works as well.
1 Like