#1 2016-12-11 23:13:44

mangstadt

Member

Registered: 2016-05-28

Posts: 20

Second Monitor Not Recognized

Hi all,

I'm trying to connect a second monitor to my computer so I can have a dual-screen display.

When I first turn the monitor on, there is a "no signal" message on the monitor.  When I plug it into the computer (via VGA), the monitor immediately goes into power saving mode.  So, it appears that some kind of connection is being made.

When I run the ARandR Screen Layout Editor (accessed from Menu > Preferences > Display > ARandR Screen Layout Editor), and go to the "Outputs" menu, the VGA1 option is grayed out.

When I run the "xrandr" from the command line, I get this output:

Screen 0: minimum 320 x 200, current 1024 x 600, maximum 4096 x 4096
LVDS1 connected 1024x600+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x600      59.99*+
   800x600       60.32    56.25  
   640x480       59.94  
VGA1 disconnected (normal left inverted right x axis y axis)

I just ran "sudo apt-get upgrade" and rebooted.  The monitor is a 14 year old LCD monitor.  It still works as far as I am aware.  Just doing some early spring cleaning and putting my old junk to good use. xD

Does anyone have any tips or ideas?  Thank you!

iMBeCil

WAAAT?

From: Edrychwch o'ch cwmpas

Registered: 2015-09-29

Posts: 767

Re: Second Monitor Not Recognized

For old monitor and presumably old VGA cable, I would first check the aforementioned VGA cable is working. Do you have another VGA cable to test it?

Otherwise, more infomation are needed: what's your laptop and what's your graphic card? For the later one, please post output of:

$ lspci -knn | grep -iA2 vga

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Postpone all your duties; if you die, you won't have to do them ..

Head_on_a_Stick

Member

From: London

Registered: 2015-09-29

Posts: 9,093

Website

Re: Second Monitor Not Recognized

You can also check for any kernel messages by opening a terminal and running this command:

dmesg -w

Then plug in the monitor and see what is printed to the terminal screen.

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Para todos todo, para nosotros nada

mangstadt

Member

Registered: 2016-05-28

Posts: 20

Re: Second Monitor Not Recognized

Do you have another VGA cable to test it?

No, I don't. Maybe I can borrow one from work.

what's your laptop and what's your graphic card?

My laptop is a 5 year old ZaReason Teo Pro Netbook.  I had to return it for repairs 3 years ago because it wouldn't turn on.  Turned out to be a defective motherboard, which they replaced.  Maybe something got messed up when they repaired it?

Here is my lspci output:

$ lspci -knn | grep -iA2 vga
00:02.0 VGA compatible controller [0300]: Intel Corporation Atom Processor D4xx/D5xx/N4xx/N5xx Integrated Graphics Controller [8086:a011]
	Subsystem: Device [1b50:5608]
	Kernel driver in use: i915

You can also check for any kernel messages by opening a terminal and running this command:

dmesg -w

Then plug in the monitor and see what is printed to the terminal screen.

Nothing happened.  No new messages appear when I plug the monitor in or unplug it.

Thanks again for your help.

Last edited by mangstadt (2016-12-13 01:29:22)

Head_on_a_Stick

Member

From: London

Registered: 2015-09-29

Posts: 9,093

Website

Re: Second Monitor Not Recognized

Is the monitor detected if you load up a "live" version of Fedora 25 or Ubuntu?

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Para todos todo, para nosotros nada

mangstadt

Member

Registered: 2016-05-28

Posts: 20

Re: Second Monitor Not Recognized

Is the monitor detected if you load up a "live" version of Fedora 25 or Ubuntu?

Loaded up Ubuntu 16.04.1 via USB.  Monitor still not detected.

"dmesg -w" command didn't display anything in Ubuntu either.

Still need to bring a VGA cable in from work.