Hi folks,
I'm trying to take the plunge and finally learn how to do things under linux. I cobbled together a machine out of some spare parts I had on hand and have been slowly integrating it into my fairly complicated system. I know this is probably not the best approach for a beginner but, here I am.
I have a 4k monitor and KVM + a bevy of switches and splitters in one room, then all of the PCs are in the other room, connected by long video cables. In the case of the new Ubuntu machine, it is using a single 50' HDMI cable running to a 4-port HDMI splitter, one port of which goes into the 8port KVM. The splitter is doing double-duty as a range extender while also sending the signal to other screens. I have several windows PCs using this exact same configuration, so it's not too out of the ordinary for me.
The problem is, the ubuntu PC is stuck at 1280x720 resolution. When I was building it, I had it in the office hooked directly to the KVM where it was doing 4k without any complaints. This behavior only started when moved into the other room and attached it to the splitter. Unfortunately I cannot easily bypass the splitter as it doubles as a range-extender; I know my windows PCs at least do not work through the KVM without the extender(oddly, they all worked find going directly into the main monitor).
When I attempt to change the resolution, the screen goes black, stays that way about 15 seconds, then eventually comes back up at the old resolution. This behavior is consistent with it waiting for a confirmation that the new resolution is working(it isn't), then reverting to the old.
Hardware:
*Corei3 dualcore 3.4ghz CPU
*16gb RAM
*2tb HD
*450 watt PSU
*Ubuntu 18.04 LTS updated an hour ago & nVidia drivers
I can provide all the specific splitters and monitors involved. In case anyone is curious, the project here is to eventually turn the machine into a home theater PC and retro gaming station, hence all of the switching and splitting.
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