View source for Did X.server recognise your monitor correctly?

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= A Quick Test to Validate these X.server Settings:= <!--T:1--> 

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It is certainly worthwhile checking that the X.server has recognised your monitor correctly. If the X.server can't recognise your monitor or incorrectly recognises your monitor your display will not be optimal. 


==The Test:== <!--T:3-->

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Enter the following command in the Terminal:


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{{UserCmd|command=xdpyinfo | grep -B2 resolution}}


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These are the results from my machine; fortunately they are correct:


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{{UserCmdOutput|command=xdpyinfo | grep -B2 resolution|result=
<pre>
screen #0:
dimensions:    1920x1200 pixels (524x321 millimeters)
resolution:    93x95 dots per inch
</pre>
}}

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'''Note:''' If you are running more than one monitor, this test will most likely provide results that are created by combining the monitors that you have connected to your machine & treating them as though they are one monitor! 

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So you may need to do some arithmetic, OR, of course you could just connect one monitor at a time for the test. ;)

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<br clear="all"/>

==What if the X.server got it wrong?== <!--T:11-->

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If the X.server can't work out what your screen size is it will set your DPI at the default of 75 x 75. If so, you will need to manually create a file like so: 

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{{UserCmd|command=touch /etc/X11/xorg.conf.d/90-monitor.conf}}

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to which you must add the pertinent details ''(see below)''.


==Getting Your Monitor's Specifications:== <!--T:15-->

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Probably the easiest way to get the required details is from the technical specifications supplied in the monitor's manual. 

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If you don't have the manual, you can search for the specifications of your monitor online; most maker's have a section on their sites for archived manuals. 

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There are also other sites out there that carry such information.


==What do I do with the Specifications:== <!--T:19-->

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Enter the following into the Terminal to call your favourite text editor as root & create an initially empty file with the right path & name:

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{{UserCmd|command=sudo <text.editor.name> /etc/X11/xorg.conf.d/90-monitor.conf}}

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Then copy the following into your editor's blank page:


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'''/etc/X11/xorg.conf.d/90-monitor.conf'''

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Section "Monitor"
     Identifier             "Monitor0"
     DisplaySize             286 179    # In millimeters
 EndSection


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You '''MUST''' replace the '''DisplaySize''' numbers with the ones for your monitor. 

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After you have done that, save the file & reboot. The next time X starts the X.server will have calculated your DPI values from the numbers that you put in the '''DisplaySize''' line above.

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To test that the X.server has done what it has supposed to do & also that there were no typo's, run the test from the start of this wiki again.


==What if I can't find the Manufacturer's Specifations?== <!--T:28-->

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You can measure your monitor & input the numbers that way, though your measurements will most likely be different than manufacturer's.

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If you can't find the manufacturer's specifications on the web, have a look at this page as you still have options available to you: [https://wiki.archlinux.org/title/Xorg#Display_size_and_DPI]

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