Arch Linux

jamesfcarter

Member

Registered: 2012-07-16

Posts: 6

[SOLVED] Problems with external displays on HP Elitebook Folio 1040

After my most recent update, when I plug my laptop into its dock I no longer get a display on the external monitor. The monitor is recognised and I when I turn in on in lxrandr the screen resolution on the laptop's display changes, but the external monitor shows no output. The only way I get get the external display to work is to reboot.

I'm on kernel 4.8.8-2-ARCH. This is the output of xrandr when it's in the broken state:

Screen 0: minimum 8 x 8, current 1920 x 1200, maximum 32767 x 32767
eDP1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 310mm x 170mm
   1920x1080     60.05*+  40.03  
   1400x1050     59.98  
   1600x900      60.00  
   1280x1024     60.02  
   1280x960      60.00  
   1368x768      60.00  
   1280x720      60.00  
   1024x768      60.00  
   1024x576      60.00  
   960x540       60.00  
   800x600       60.32    56.25  
   864x486       60.00  
   640x480       59.94  
   720x405       60.00  
   640x360       60.00  
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP2-1 disconnected (normal left inverted right x axis y axis)
DP2-2 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 520mm x 320mm
   1920x1200     59.95*+
   1920x1080     60.00  
   1600x1200     60.00  
   1680x1050     59.88  
   1280x1024     60.02  
   1440x900      59.90  
   1280x960      60.00  
   1024x768      60.00  
   800x600       60.32  
   640x480       59.94  
DP2-3 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

Can anyone suggest what I could do to fix this?

Thanks.

Last edited by jamesfcarter (2016-11-25 12:35:05)

paulkerry

Member

From: Sheffield, UK

Registered: 2014-10-02

Posts: 611

Re: [SOLVED] Problems with external displays on HP Elitebook Folio 1040

You haven't mentioned which graphics adapter you have.
If it's intel graphics, perhaps try the modesetting driver or alternatively, have you tried the linux-lts kernel?

jamesfcarter

Member

Registered: 2012-07-16

Posts: 6

Re: [SOLVED] Problems with external displays on HP Elitebook Folio 1040

I do have intel graphics. Ditching the intel driver didn't help, but moving to the LTS kernel did the trick.

Thanks!