[Solved] Dual Monitors xrandr, HDMI not available

scoutthedog · 2019-09-23 03:32:56

I'm running one monitor into my Video Card with DisplayPort and another with HDMI. However xrandr's output shows HDMI as disconnected:

$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DisplayPort-0 disconnected primary (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
DisplayPort-2 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 480mm x 270mm
   1920x1080     74.97 +  60.00*   50.00    59.94  
   1680x1050     59.95  
   1400x1050     59.98  
   1600x900      60.00  
   1280x1024     60.02  
   1440x900      59.89  
   1280x800      59.81  
   1152x864      59.97  
   1280x720      60.00    50.00    59.94  
   1024x768      60.00  
   800x600       60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       60.00    59.94  
HDMI-A-0 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)

This monitor setup works out of the box on windows 10, so no hardware issues. I am using the AMDGPU driver with a Radeon RX 580 card. What can I try to fix this?

Thanks!

Last edited by scoutthedog (2019-09-23 23:33:25)

seth · 2019-09-23 06:20:58

Please post the output of dmesg and your xorg log. You can use https://wiki.archlinux.org/index.php/Pastebin to feed dmesg directly into a pastebin.
Also ceterum censeo: https://wiki.archlinux.org/index.php/Du … t_Start-Up

scoutthedog · 2019-09-23 12:22:17

Thanks seth,

Here is my dmesg output

http://ix.io/1Wyg

And here is my Xorg.0.log

http://ix.io/1Wyf

seth · 2019-09-23 13:36:52

There no kernel errors and no weirdness in the xorg log.

=> Did you check because of Windows "Fast-Start"?
Otherwise try passing "amdgpu.dc=0 amdgpu.audio=0 amdgpu.dpm=0 amdgpu.aspm=0 amdgpu.runpm=0 amdgpu.bapm=0" to the kernel. (dc is the "new" Display Core driver, audio should be obvious, the rest is powersaving stuff)

scoutthedog · 2019-09-23 23:31:49

Windows Fast-Start was disabled, so I tried those kernel boot parameters and it worked! I'm not sure I understand why but it's solved. Thank you so much!

seth · 2019-09-24 06:18:42

You should try which of them in particular is the critical one (though the PM might only act in toto)
This will hint on what's the actual problem here.

Arch Linux

#1 2019-09-23 03:32:56

[Solved] Dual Monitors xrandr, HDMI not available

#2 2019-09-23 06:20:58

Re: [Solved] Dual Monitors xrandr, HDMI not available

#3 2019-09-23 12:22:17

Re: [Solved] Dual Monitors xrandr, HDMI not available

#4 2019-09-23 13:36:52

Re: [Solved] Dual Monitors xrandr, HDMI not available

#5 2019-09-23 23:31:49

Re: [Solved] Dual Monitors xrandr, HDMI not available

#6 2019-09-24 06:18:42

Re: [Solved] Dual Monitors xrandr, HDMI not available

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