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-   -   Lower resolution on monitor after KVM hookup. Monitor switched from Acer to Unknown. (https://www.linuxquestions.org/questions/linux-general-1/lower-resolution-on-monitor-after-kvm-hookup-monitor-switched-from-acer-to-unknown-4175533073/)

anonku 02-04-2015 02:20 PM

Lower resolution on monitor after KVM hookup. Monitor switched from Acer to Unknown.
 
I have an Acer 19" monitor. It worked fine at the resolution that I wanted 1280 x 1024.
Then I hooked up a KVM switch to it and now it lists it as an Unknown Monitor and the max resolution is 1024 x 768.
I am somewhat new to Linux and was wondering if there is a way to make it recognize the monitor type or increase the resolution.

I do not think the KVM should limit the resolution?

VGA connectors being used.

Ubuntu 14.04, Radeon 5500/6500 series. Dual Display, Acer is the second display.

allend 02-04-2015 06:50 PM

It is likely that the KVM switch is stopping your monitor from being probed for EDID information.
I would try running without the KVM switch, and collect the output from 'xrandr -q --verbose'. This information can be used for creating a suitable modeline for your monitor. For further details, look under 'Adding undetected resolutions' here. https://wiki.ubuntu.com/X/Config/Resolution

jefro 02-04-2015 09:33 PM

Generally if you boot to the unused side of the KVM it sends a faux signal to the OS.

Could be a bad or cheap kvm.

Set linux as button one and then keep it on while booting/loading.


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