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[SOLVED] USB Monitor with Gentoo without using X
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volca
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Joined: 24 Jan 2015
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PostPosted: Thu Oct 01, 2015 10:23 pm    Post subject: [SOLVED] USB Monitor with Gentoo without using X Reply with quote

Hello.
I have a small GPS display/USB display (MIMO UM-740). All I really want to do with it is have it connected to my server to display htop. I've gone through the necessary steps to get it set up (to a point). I compiled the necessary kernel modules and began setting up displaylink via the guide on the gentoo wiki. (https://wiki.gentoo.org/wiki/DisplayLink).

I've gotten up to this point: "After booting into the new kernel the external monitor should show a green background image. That means the kernel module is loaded and the device works, it also creates the device in /dev/fb0".
It does in fact show a green screen. After that, it says to install an X driver, whose dependencies seem to be a large portion of X, including xorg-server.

I don't want to run an X server at all, I just want it to treat the display as just that, a simple display, such as how powering on the machine with a monitor connected to the VGA port would show the boot process and eventually a login shell.

Is there any method I could try to achieve this? Any ideas at all?

TL;DR: I want to use a MIMO UM-740/USB Display to use as an htop monitor for my gentoo server. The method I've tried so far wants me to install a large portion of X. I don't want this, as I only need a CLI for htop. Is there a specific reason it requires X that I don't know about? Is there a way to use it simply as a regular computer monitor?


Last edited by volca on Fri Oct 02, 2015 1:50 am; edited 1 time in total
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TheLexx
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Joined: 04 Dec 2005
Posts: 115
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PostPosted: Fri Oct 02, 2015 12:17 am    Post subject: Reply with quote

What you should be asking is ...

"does the DisplayLink USB interface emulate 'text mode', 'vesa mode' or 'VGA-compatible text mode'"

Which according to this thread
http://lists.freedesktop.org/archives/libdlo/2011-May/thread.html
The answer is no.

I know nothing about DisplayLink so you will have to research it farther yourself.
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TheLexx
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Joined: 04 Dec 2005
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Location: Austin Tx

PostPosted: Fri Oct 02, 2015 12:47 am    Post subject: Reply with quote

Soon after I posted I remembered linux frambuffer can emulate the text mode . You want you want to do is emulate text mode with the framebuffer for DisplayLink.

A little creative Googling gave me ...
https://www.google.com/search?q=framebuffer+text+mode+DisplayLink


The top answer was

[SOLVED]How to get displaylink USB to show text console
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volca
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Joined: 24 Jan 2015
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PostPosted: Fri Oct 02, 2015 1:50 am    Post subject: Reply with quote

Sweet! Thanks for all your help, using the links and some further research, I managed to get it running exactly how I wanted it to

seems like I still have a lot to learn and I gotta get my google-fu up to snuff too
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