Note: guide is for 1024x768@60 monitor, if you have different one then use file accordingly.
The Issue:
I was struggling with a Tech-Com VGA monitor on Kubuntu. While X11 worked fine, switching to Wayland caused the monitor to go “Out of Range” or simply crash the session.
The Symptoms (from logs):
KWin Log: kwin_core: EDID colorimetry… is invalid and kwin_wayland_drm: Atomic modeset test failed! Permission denied.
The “Why”:
Legacy or cheap VGA monitors often have corrupted internal chips (EDID). They tell the computer they can handle high refresh rates (like 75Hz) that they actually can’t, or they send “all zero” color data. KWin Wayland is stricter than X11; it sees this “invalid” data, fails a safety test (Atomic Modeset), and shuts down the display.
The Fix: Forced EDID Override
To fix this, I had to “lie” to the computer and give it a perfect, fake identity for my monitor.
Step 1: Create a “Clean” EDID Binary:
create or use a existing binary according to your resolution.
file one i use: link not allowd
move it to /lib/firmware/edid
Step 2: Bake it into the Boot Sequence (Initramfs)
The driver loads very early, before your hard drive is mounted. You must put the file in the boot ramdisk:
sudo nano /etc/initramfs-tools/modules
add these lines at end:
i915
edid/1024x768.bin
Step 3: Update GRUB Parameters
Tell the kernel to use your new file instead of the monitor’s broken chip:
sudo nano /etc/default/grub
Update the quiet splash line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash drm.edid_firmware=VGA-1:edid/1024x768.bin
Step 4: update both grub and ramdisk:
sudo update-grub
sudo update-initramfs -u
Step 5: Physical Adjustment
After rebooting, the screen might have a black portion on the side because analog timings differ. Use the physical “AUTO ADJUST” button on your monitor to re-center the image.
done.
I share this because if anyone have these type of issue can fix, because i am try to get help but nobody help me, even kde developers ignore my bug report and emails.
then i search on internet and i found a debian wiki blog which explains custom edid file and how to load them.