On Fri, 2023-06-30 at 13:26 -0400, Robert Moskowitz wrote: > And what is EDID? And would that come through the KVM?
It's the monitor identifying itself to the video card. With very old VGA monitors that could have been just one or two spare pins in the plug grounded, indicating a certain video mode to be used (and that sort of thing might only be noticed by a few graphics cards). With much more modern hardware, it's serial data transmitted from the monitor. The monitor literally identifies itself, and lists its supported video modes. Your graphics system would then look through the table of supported modes for the monitor (scan rates and dot clocks), likewise for the graphics card, and automatically select the best mode that both can do. Some KVMs can tell all their remote PCs what the attached monitor tells it about itself. Other's will simply provide some dummy info to get the PC to give it a video signal. Then you just have to hope things work. If you had a KVM which specifies that it only supports one or two graphics modes, I'd suspect it's one of those that ignores your monitors EDID. Other users who've had problems with their monitors providing incorrect information to their graphics card have found ways to shoehorn in their own custom data to override it. Going from memory, I think Tom Horsley on this list was one of them. The same thing (faking your own custom EDID) could help with monitors with failing EDID circuitry, or broken VGA cable wiring. -- NB: All unexpected mail to my mailbox is automatically deleted. I will only get to see the messages that are posted to the list. The following system info data is generated fresh for each post: uname -rsvp Linux 6.2.15-100.fc36.x86_64 #1 SMP PREEMPT_DYNAMIC Thu May 11 16:51:53 UTC 2023 x86_64 _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
