Unrecognized Monitor stuck at 1024x768

[Matt Graham]

On 2018-03-01 09:35, Victor Odhner wrote:
>> It's a Visio E241-A1 (TV set), claiming 1920x1080.
>> I’m running Linux Mint 18.3 Sylvia, with Mate.
>> vodhner at MusicTeam ~ $ xrandr -q
>> DP1 connected 1024x768+0+0 1024x768 60.00*
>> vodhner at MusicTeam ~ $ xrandr --newmode "1024x1080_60.00" 92.30 1024
>> 1088 1200 1376 1080 1081 1084 1118 -HSync +Vsync
>> vodhner at MusicTeam ~ $ xrandr --addmode DP1 "1920x1080_60.00"
>> xrandr: cannot find mode "1920x1080_60.00"
> I'm using the VGA port since I'm talking to this monitor via a KVM
> that only knows VGA.

I don't think you'll be able to drive a monitor at 1920x1080 using VGA. 
You'll have to use something a little more advanced to get more than 
about 1280x1024, because VGA was intended for analog displays that were 
much smaller.  The xrandr command says you're running on a DisplayPort, 
which will easily do higher resolutions, but the KVM you're using will 
almost certainly downsample whatever it gets.

Also, have another look at the new Modeline you put in.  You called it 
"1024x1080_60.00" and you're trying to use "1920x1080_60.00", which of 
course does not exist.  Typos cause troubles :-)  The line also looks 
wrong to me, as it doesn't have any numbers >= 1920 in it, and it should 
if it's specifying a resolution 1920 pixels wide.

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