22
How to Debug Video Mode not Supported
(lemmy.ml)
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
this post was submitted on 06 Nov 2025
22 points (100.0% liked)
Linux
57274 readers
429 users here now
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Rules
- Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.
- No misinformation
- No NSFW content
- No hate speech, bigotry, etc
Related Communities
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
founded 6 years ago
MODERATORS
I don't have deep knowledge on the topic but you might want to look into EDID, which is how your system knows what resolutions the monitor supports. Incorrect detection of maximum resolutions and refresh rates is a semi-common problem on Linux and the fix for that is a custom modeline; setting one will be compositor dependent on Wayland (on X11 xrandr will do).
However it's also possible that all the cables you have are bad and/or don't support 8K.
Thanks for the advice, I installed the Debian package "read-edid" and used the get-edid program from it to get the EDID from the monitor. Then I installed the "wxedid" package to display it graphically because the parse-edid program from read-edid didn't work well. According to wxedid there's a seletion of 38402160 modes and some 40962160 modes. So it seems that the EDID is the problem.