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Old 12-11-2012, 11:17 AM   #1
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Using HDTV as monitor, can't select high resolutions.

Hello all! Here's my problem: I'm using an APEX 24" 1080p LED-LCD HDTV as a monitor, connected via 15 pin VGA cable. The TV's native resolution is 1920x1080 60Hz. My problem is that it shows my "monitor" as UNKNOWN, and will only let me select 1024x768 as the highest resolution.

I've tried several different distros, and am having this issue with all of them. Currently, I'm using Mint Debian Edition 64 bit.

At first I thought it was my video card drivers. Nvidia GeForce 8400 GS. After I installed the Nvidia driver, things got even worse! Now, all my text is crappy looking and the highest resolution I can see is 640X480!

I believe the problem is happening because the TV doesn't send an EDID signal to the connection, or possibly it is sending the signal in an uncoventional format that Linux can't use.

I know that the TV is capable of 1920x1080 display using the VGA port because I have a Windows 7 box connected via KVM switch, and it doesn't have any problems. Also, I checked the specs on my graphics card, and it should be capable of much higher resolutions than what I'm asking of it.

I've tried researching this problem and found that, apparently, there are some lines you can add to your xorg.conf? I tried that a few distros ago, and it bricked my gui
Old 12-11-2012, 12:27 PM   #2
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Open a konsole, and run the command 'xrandr' ( without quotes ) with the TV connected. Post the results. It should list available modes for your system display and the external monitor.

xrandr can be used to set display modes, and should be able to change the mode sent to the TV.

There is built in help, 'xrandr -help' will give you all the options.
Old 12-11-2012, 01:37 PM   #3
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Originally Posted by gaftfreak View Post
I have a Windows 7 box connected via KVM switch, and it doesn't have any problems.
This may be the problem. I often have seen problems with recognizing the correct resolutions if a KVM is used. It may be worth a try to see if the monitor's resolution is recognized correctly when it is connected directly to the video card. This would rule out problems with the driver and/or video card.
Old 12-12-2012, 12:47 AM   #4
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Thanks everyone, but I just got this fixed. I installed Sabayon, which found and configured my Nvidia card. Then, I had to manually add my resolution to my xorg.conf .
Old 12-12-2012, 10:14 PM   #5
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Thanks for the update and solution.


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