I'm running Ubuntu on a PC that I which to connect to a TV. I had trouble making my TV recognize the PC. It says that the resolution of the external device is not supported. Since I could not get an image, I plugged a old monitor to my computer and adjusted the resolution using the monitor. It worked. I got the image on the TV as I wanted, but if a unplug the monitor from my computer, I get the same error on my TV. Apparently, if my monitor is not plugged in, Ubuntu messes up the resolution that I had set and my TV does not show the picture. I think it has something to do with the refresh rate, because I could only get it to work, when I set the refresh rate to 60 hz.
My goal is to use the TV exclusive and have no monitors plugged in my computer. I have no idea of what is happening. I've unplugged the power cord from the monitor and everything still works, but if I unplug the dvi cable, Ubuntu changes the resolution and my TV does not display the image.
Can anyone help me?
Here is some more clarification on the situation:
The problem is not the 60Hz refresh rate. I'm fine with the value, the problem is that Ubuntu apparently changes this value automatically when I unplug the monitor, this change in value renders my TV unable to display the image from the PC.
My problem is that I want to have only a TV plugged to my computer, without the need to have a monitor plugged in as well. Even with the monitor completely turned off (with no power cord), if I unplug the DVI cable, Ubuntu changes the resolution and the image stops showing on my TV.
The TV is a Samsung TV (Samsung 50TU8000) and it is connect to the PC using a HDMI cable.
The command xrandr prints the following:
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DVI-I-1 connected (normal left inverted right x axis y axis)
1920x1080 60.00 + 59.96 50.00 59.94 59.93
1680x1050 69.88 59.95 59.88
1600x1024 60.17
1400x1050 74.76 70.00 59.98
1600x900 59.95 60.00 59.82
1280x1024 75.02 60.02
1440x900 59.89 59.90
1400x900 59.96 59.88
1280x960 60.00
1440x810 59.97
1368x768 59.88 59.85
1360x768 59.80 59.96
1280x800 59.99 59.97 59.81 59.91
1152x864 75.00 75.00 70.00 60.00
1280x720 60.00 59.99 59.86 60.00 50.00 59.94 59.74
1024x768 75.05 60.04 75.03 70.07 60.00
960x720 75.00 60.00
928x696 75.00 60.05
896x672 75.05 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
832x624 74.55
960x540 59.96 59.99 59.63 59.82
800x600 75.00 70.00 65.00 60.00 72.19 75.00 60.32 56.25
840x525 74.96 69.88 60.01 59.88
864x486 59.92 59.57
720x576 50.00
800x512 60.17
700x525 74.76 70.06 59.98
800x450 59.95 59.82
720x480 60.00 59.94
640x512 75.02 60.02
720x450 59.89
700x450 59.96 59.88
640x480 60.00 75.00 72.81 75.00 66.67 60.00 59.94
720x405 59.51 58.99
720x400 70.08
684x384 59.88 59.85
680x384 59.80 59.96
640x400 59.88 59.98
576x432 75.00 75.00 70.00 60.06
640x360 59.86 59.83 59.84 59.32
512x384 75.03 70.07 60.00
512x288 60.00 59.92
416x312 74.66
480x270 59.63 59.82
400x300 72.19 75.12 60.32 56.34
432x243 59.92 59.57
320x240 72.81 75.00 60.05
360x202 59.51 59.13
320x180 59.84 59.32
DVI-I-2 disconnected (normal left inverted right x axis y axis)
HDMI-3 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 1872mm x 1053mm
1920x1080 59.97 59.96 60.00* 50.00 59.94 59.93 30.00 25.00 24.00 29.97 23.98
1920x1080i 60.00 50.00 59.94
1680x1050 74.89 69.88 59.95 59.88
1600x1024 60.17
1400x1050 74.76 70.00 59.98
1600x900 59.99 59.94 59.95 60.00 59.82
1280x1024 75.02 60.02
1440x900 59.89 59.90
1400x900 59.96 59.88
1280x960 60.00
1440x810 60.00 59.97
1368x768 59.88 59.85
1360x768 59.80 59.96
1280x800 59.99 59.97 59.81 59.91
1152x864 75.00 75.00 70.00 60.00
1280x720 60.00 59.99 59.86 60.00 50.00 59.94 59.74
1024x768 75.05 60.04 75.03 70.07 60.00
960x720 75.00 60.00
928x696 75.00 60.05
896x672 75.05 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
832x624 74.55
960x540 59.96 59.99 59.63 59.82
800x600 75.00 70.00 65.00 60.00 72.19 75.00 60.32 56.25
840x525 74.96 69.88 60.01 59.88
864x486 59.92 59.57
720x576 50.00
800x512 60.17
700x525 74.76 70.06 59.98
800x450 59.95 59.82
720x480 60.00 59.94
640x512 75.02 60.02
720x450 59.89
700x450 59.96 59.88
640x480 60.00 75.00 72.81 75.00 66.67 60.00 59.94
720x405 59.51 58.99
720x400 70.08
684x384 59.88 59.85
680x384 59.80 59.96
640x400 59.88 59.98
576x432 75.00 75.00 70.00 60.06
640x360 59.86 59.83 59.84 59.32
512x384 75.03 70.07 60.00
512x288 60.00 59.92
416x312 74.66
480x270 59.63 59.82
400x300 72.19 75.12 60.32 56.34
432x243 59.92 59.57
320x240 72.81 75.00 60.05
360x202 59.51 59.13
320x180 59.84 59.32
VGA-1-1 disconnected (normal left inverted right x axis y axis)
HDMI-1-1 disconnected (normal left inverted right x axis y axis)
DP-1-1 disconnected (normal left inverted right x axis y axis)
HDMI-1-2 disconnected (normal left inverted right x axis y axis)
DP-1-2 disconnected (normal left inverted right x axis y axis)
The TV does not show BIOs screen when loading. The first image it shows, when I use this set up (with the monitor plugged in and turned off) is the Ubuntu loading screen.
