2nd Monitor not working, possibly due to update

KingShish · 2019-07-24 04:19:27

Hi Guys,

My 2nd monitor stopped working yesterday, after I came back from a client. I had my laptop plugged into a screen at the client and it ran out of battery towards the end of the presentation, when I came home the HDMI monitor doesn't work.

sudo udevadm monitor does not show anything when I unplug and plug the cable in

lspci | grep VGA only shows one VGA which is the laptop monitor

xrandr obviously only shows one monitor as well

The graphics card is the intel onboard graphics card, and I'm hoping I didn't break the port when I unplugged at the client.

Any Ideas?

seth · 2019-07-24 06:14:44

"lspci | grep VGA" doesn't show outputs at all.
Post the complete lspci and xrandr outputs.

Agh42 · 2019-07-24 08:38:09

I have the same problem, so does a colleague. I have noticed that xrandr no longer shows the resolution "1920x1200" for my two external monitors.

Here is my original setup which worked up until doing a pacman -Syu this morning:

"xrandr --output eDP1 --off --output DP1 --off --output DP2 --off --output DP2-1 --mode 1920x1200 --pos 1920x0 --rotate normal --output DP2-2 --primary --mode 1920x1200 --pos 0x0 --rotate normal --output DP2-3 --off --output HDMI1 --off --output HDMI2 --off --output VIRTUAL1 --off"

This no longer works because the resolution is no longer available:

>xrandr

Screen 0: minimum 8 x 8, current 4608 x 1440, maximum 32767 x 32767
eDP1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 310mm x 170mm
   2560x1440     60.01*+  59.95  
   1920x1440     60.00  
   1856x1392     60.01  
   1792x1344     60.01  
   2048x1152     60.00    59.90    59.91  
   1920x1200     59.88    59.95  
   1920x1080     59.96    60.00    59.93  
   1600x1200     60.00  
   1680x1050     59.95    59.88  
   1400x1050     59.98  
   1600x900      60.00    59.95    59.82  
   1280x1024     60.02  
   1400x900      59.96    59.88  
   1280x960      60.00  
   1368x768      60.00    59.88    59.85  
   1280x800      59.81    59.91  
   1280x720      59.86    60.00    59.74  
   1024x768      60.00  
   1024x576      60.00    59.90    59.82  
   960x540       60.00    59.63    59.82  
   800x600       60.32    56.25  
   864x486       60.00    59.92    59.57  
   640x480       59.94  
   720x405       59.51    60.00    58.99  
   640x360       59.84    59.32    60.00  
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP2-1 connected 1024x768+2560+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768      60.00* 
   800x600       60.32    56.25  
   848x480       60.00  
   640x480       59.94  
DP2-2 connected 1024x768+3584+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768      60.00* 
   800x600       60.32    56.25  
   848x480       60.00  
   640x480       59.94

Last edited by Agh42 (2019-07-24 13:02:03)

seth · 2019-07-24 10:31:29

@Agh42 please use code tags for shell outputs and text contents, https://bbs.archlinux.org/help.php#bbcode
I'm not entirely sure this is the same problem, since the OP described the absence of the 2nd output where your outputs on DP2-1/2 seem to simply fail on EDID data, possibly because this looks like a hub/daisy-chain?
=> https://wiki.archlinux.org/index.php/Xr … esolutions

KingShish · 2019-07-24 10:37:59

It turns out it was a kernel update that broke it, I reverted back to the previous one and it works now

seth · 2019-07-24 10:47:03

dmesg comparism?

Agh42 · 2019-07-24 13:00:12

Hi seth, I guess you were right - probably a different problem from OPs:

I just solved mine by blacklisting the nouveau driver and using just i915.

In case it helps anyone else: this is what I put in /etc/modprobe.d/blacklist-nouveau.conf:

blacklist nouveau
blacklist lbm-nouveau
options nouveau modeset=0
alias nouveau off
alias lbm-nouveau off

seth · 2019-07-24 13:05:35

You want to read up https://wiki.archlinux.org/index.php/Optimus

Arch Linux

#1 2019-07-24 04:19:27

2nd Monitor not working, possibly due to update

#2 2019-07-24 06:14:44

Re: 2nd Monitor not working, possibly due to update

#3 2019-07-24 08:38:09

Re: 2nd Monitor not working, possibly due to update

#4 2019-07-24 10:31:29

Re: 2nd Monitor not working, possibly due to update

#5 2019-07-24 10:37:59

Re: 2nd Monitor not working, possibly due to update

#6 2019-07-24 10:47:03

Re: 2nd Monitor not working, possibly due to update

#7 2019-07-24 13:00:12

Re: 2nd Monitor not working, possibly due to update

#8 2019-07-24 13:05:35

Re: 2nd Monitor not working, possibly due to update

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