Connecting HDMI on Debian

Pramod Herath

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Hello all,
I recently installed Debian 9 on my laptop. Everything is good except that HDMI devices that I plug in after the computer has already booted are not recognized at all. However, if the device is plugged in before starting the computer, then it works fine. I googled around and found out xrandr command. Here's it's output if it helps.

xrandr command output when HDMI is not plugged in or when the device is plugged after booting (no difference):

[email protected]:~$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
1920x1080 60.01*+ 59.93 48.01
1680x1050 59.95 59.88
1600x1024 60.17
1400x1050 59.98
1280x1024 60.02
1440x900 59.89
1280x960 60.00
1360x768 59.80 59.96
1152x864 60.00
1024x768 60.04 60.00
960x720 60.00
928x696 60.05
896x672 60.01
960x600 60.00
960x540 59.99
800x600 60.00 60.32 56.25
840x525 60.01 59.88
800x512 60.17
700x525 59.98
640x512 60.02
720x450 59.89
640x480 60.00 59.94
680x384 59.80 59.96
576x432 60.06
512x384 60.00
400x300 60.32 56.34
320x240 60.05
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)


if the device is connected before booting, the same command gives the following output:

[email protected]:~$ xrandr
Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 8192 x 8192
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
1920x1080 60.01*+ 59.93 48.01
1680x1050 59.95 59.88
1600x1024 60.17
1400x1050 59.98
1280x1024 60.02
1440x900 59.89
1280x960 60.00
1360x768 59.80 59.96
1152x864 60.00
1024x768 60.04 60.00
960x720 60.00
928x696 60.05
896x672 60.01
960x600 60.00
960x540 59.99
800x600 60.00 60.32 56.25
840x525 60.01 59.88
800x512 60.17
700x525 59.98
640x512 60.02
720x450 59.89
640x480 60.00 59.94
680x384 59.80 59.96
576x432 60.06
512x384 60.00
400x300 60.32 56.34
320x240 60.05
DP-1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 477mm x 268mm
1920x1080 60.00*+
1600x900 60.00
1280x1024 75.02 60.02
1152x864 75.00
1024x768 75.03 60.00
800x600 75.00 60.32
640x480 75.00 59.94
720x400 70.08
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)

Is there any way that I could set it up so that I can plug and use the HDMI monitors while the computer is already running?

Any help will be appreciated!
 


wizardfromoz

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So is it just the video that is affected, how is sound?

G'day @Pramod Herath and welcome to linux.org :)

I won't likely have the answer for you, but I am moving this Thread to Audio/Video, which usually provides more answers for HDMI questions.

Good luck

Chris Turner
wizardfromoz
 

Pramod Herath

New Member
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So is it just the video that is affected, how is sound?

G'day @Pramod Herath and welcome to linux.org :)

I won't likely have the answer for you, but I am moving this Thread to Audio/Video, which usually provides more answers for HDMI questions.

Good luck

Chris Turner
wizardfromoz
Thank you for the help! And a very good day to you too!
I've only tested it for video. But I think it's mostly likely both. Because my computer doesn't seem to even recognize an HDMI device is attached.
 


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