Enabling higher resolution in wayland

josealberto4444 · July 31, 2024, 7:18am

I have a Philips 245E1 monitor. It doesn’t seem to send the correct edid or something, so it was a struggle to get it to work properly on Linux when I bought it some years ago (I’m currently using Manjaro). In system settings, I can only choose resolutions up to 1920x1080, but it supports a resolution of 2560x1440 at 60 Hz, as I was using it like that on X11 with this custom modeline in /etc/X11/xorg.conf.d/10-monitor.conf

Modeline "2560x1440" 241.5 2560 2608 2640 2720 1440 1443 1448 1481 +hsync +vsync

However, I want to use wayland and I cannot get it to work. I tried without success:

Generating an edid bin from that modeline, putting it in /usr/lib/firmware/edid and adding drm_kms_helper.edid_firmware=edid/2560x1440.bin to grub.
Adding video=HDMI-A-1:2560x1440@60 to grub.

I’m out of ideas for searching anything else. Can you help me? =)

meven · July 31, 2024, 7:47am

Can you share the output of the command kscreen-doctor -o

And maybe also the output of drm_info -j

Please tell us your distro and Plasma version (just to complete the context).

KWin does add common modes (that’s resolution+frequency) for screen that miss it obviously in their edid. I know about 1920x1080@60, if we can guess your screen is supposed to support 2560x1440, we might be able to adjust this.

Please report a bug for KWin on https://bugs.kde.org/ with the details I asked.

josealberto4444 · July 31, 2024, 8:19am

I am using Manjaro and plasma 6.0.5.

KWin does add common modes (that’s resolution+frequency) for screen that miss it obviously in their edid. I know about 1920x1080@60, if we can guess your screen is supposed to support 2560x1440, we might be able to adjust this.

According to the page www [dot] edid [dot] tv/edid/1959/ (I can’t post links, sorry), the maximum available for this screen is 2560x1440@74.97Hz, but my laptop only support up to 60 Hz, so I cannot check. In that page you can also download the edid provided for the TV (allegedly), in case it helps.

Please report a bug for KWin on with the details I asked.

OK, I’m on it now, but I’ll leave also the details here just in case it helps someone.

kscreen-doctor -o

Output: 2 HDMI-A-1
        enabled
        connected
        priority 1
        HDMI
        Modes:  0:1920x1080@60*  1:1920x1080@60  2:1920x1080@60  3:1920x1080@60!  4:1920x1080@60  5:1920x1080@50  6:1920x1080@50  7:1280x1440@60  8:1680x1050@60  9:1280x1024@75  10:1280x1024@60  11:1440x900@60  12:1280x960@60  13:1280x720@60  14:1280x720@60  15:1280x720@60  16:1280x720@50  17:1024x768@75  18:1024x768@70  19:1024x768@60  20:832x624@75  21:800x600@75  22:800x600@72  23:800x600@60  24:800x600@56  25:720x576@50  26:720x576@50  27:720x576@50  28:720x480@60  29:720x480@60  30:720x480@60  31:720x480@60  32:720x480@60  33:640x480@75  34:640x480@73  35:640x480@67  36:640x480@60  37:640x480@60  38:640x480@60  39:720x400@70 
        Geometry: 0,0 1280x720
        Scale: 1.5
        Rotation: 1
        Overscan: 0
        Vrr: incapable
        RgbRange: Automatic
        HDR: incapable
        Wide Color Gamut: incapable
        ICC profile: none

The output of drm_info -j does not fit here, but I’ll put it in the bug report.

josealberto4444 · July 31, 2024, 10:08am

Done, it’s the bug with id=491054 (I cannot post the link).

meven · July 31, 2024, 10:23am

I have some privileged as a regular known contributor, posting links : 491054 – No resolution higher than Full HD in wayland

guss77 · March 8, 2026, 10:32am

Update: as reported in bug 456697 (not the one linked above, the one linked from that), as of December 2025 (in git) and Plasma 6.6 (released), KDE supports custom modelines that will let you add custom resolutions and refresh rates to the ones reported by your display.

The full details are in the merge request libkscreen MR!266, but it generally goes like this:

To add a custom full screen 1920x1080 with 75Hz refresh:

kscreen-doctor output.1.addCustomMode.1920.1080.75000.full

You can then see the result in the output of kscreen-doctor -o:

(The refresh rate is “not accurate” because things like actual display bandwidth, etc)

You can remove such custom mode by using the index number of the custom mode (the first one is 0, as can be seen in the screenshot) like so:

kscreen-doctor output.1.removeCustomMode.0

The full at the end of the addCustomMode command means that the new mode is stretched to fit the screen. The other option is reduced which will leave black bars on the aspect that doesn’t fit when kwin matches resolution and aspect ratio for your screen - this could be top and bottom black bars if you set the height “too low” or right and left black bars if you set the resolution not wide enough.