HDMI not detected by `xrandr` [closed]

Question

There's no output from my HDMI port and my TV shows NO Signal.

My Current OS: Linux Mint 15

Things I have tried with no success:

1. Change the HDMI cable
2. Install another operating system ( Windows 7, Windows 8 and Ubuntu)
3. Tried to connect to a different TV

Eventually I thought that my HDMI port was damaged, until I ran the following command aplay -l:

output:

**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0

As you guys can see, I saw HDMI 0, so there's nothing wrong with my HDMI port.

Furthermore xrandr does not detect it, please take a look at xrandr output as well:

Screen 0: minimum 320 x 200, current 1366 x 768, maximum 32767 x 32767
LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
   1366x768       59.6*+
   1360x768       59.8     60.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
VGA1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
TV1 disconnected (normal left inverted right x axis y axis)

HDMI is not listed, please guys I need your help with this, there's no response when I connect my HDMI cable to the computer. There's no video/audio output on my TV screen.

Answer 1

I realize this is an old question, but I had similar problems and I hope that my findings will be helpful to some of you:

In Linux Mint 18, I had trouble finding or enabling my TV connected via hdmi when it was turned off. I could enable it via the "Re-Detect display devices" Shortcut -

<MOD>+p or <Winkey>+p

by default, but without this I could not enable or use the device in xrandr or arandr.

later on I realized that, in order to use the display in xrandr, I had to do three things:

1) Disable unused displays with

xrandr --output HDMI-1-2 --off --output DVI-I-1-3 --off

This step was especially important because my card only supports 2 simultaneous outputs, so it wouldnt let me enable the third while the other two were active.

2) Enable the wanted display with

xrandr --output HDMI-1 --auto

For some reason, I had to do this as xrandr wouldnt detect or activate the monitor just by setting the mode with the following (and last) command

3) Set the preferred mode with

xrandr --output HDMI-1 --mode 1920x1080 --pos 0x0

after enabling the Output in the step before, the Display should now accept your monitor settings.

Bonus) Creating the commands you can get a quick list of your available displays for the --output option above in terminal by typing

xrandr | grep connect

if you need help in setting the overall settings you can also use a gui tool called ARandr, which can be installed with the command

sudo apt-get install arandr

this tool will allow you to position your screens and save the settings to a .sh file which will contain the xrandr command for your setup, you will only have to add the --auto option manually.

Note) My experience You could combine all the options into one xrandr command, but this gave me some problems and weird behavior. I found most reliable to add those lines to a script one by one and even add a sleep 1 between the three lines.

Answer 2

So you've tried four OSs, including Windows, and it didn't work with any of them? Then it's very likely to be a hardware problem. The data in aplay -L doesn't preclude a hardware problem because that information comes from your audio chipset, not the actual HDMI port. If it's still under warranty, contact the manufacturer.

Answer 3

I think this is an error at the hardware level: I had this same issue that started in the middle of an Linux Mint (KDE) Session. XRandR and Display Configuration tools both stopped detecting my displays even after reboot. Unplugging and re-plugging in the cables and trying different monitors didn't help.

What worked: Booting into an old Semplice Linux (2011) distro and using the XRandR to 'turn on' HDMI. Upon booting back into Linux Mint, my HDMI screens were suddenly detected (after weeks of not seeing them).

Unfortunately, I borked that partition trying to update (the software needed to remove the filesystem got removed in an attempt to resolve dependencies), so I can't fully recapitulate exactly where the setting was.