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. |
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 |
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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