External monitor not detected on 13.04 on a Dell XPS 13 via Mini DP

[Antonio Roberts]

I upgraded my Dell XPS 13 Developer Edition laptop from 12.04 to 13.04 (Kernel: 3.8.0-27-generic #40-Ubuntu SMP) and now it seems the Mini Display Port isn't working at all. I've tried using an Apple-branded Mini DP to VGA adaptor and a generic Mini DP to HDMI adaptor and neither is detected. Here's my terminal output:

hellocatfood@computerfood:~$ xrandr -q
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 32767 x 32767
eDP1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 294mm x 165mm
   1920x1080 60.0*+ 59.9 40.0
   1680x1050 60.0 59.9
   1600x1024 60.2
   1400x1050 60.0
   1280x1024 60.0
   1440x900 59.9
   1280x960 60.0
   1360x768 59.8 60.0
   1152x864 60.0
   1024x768 60.0
   800x600 60.3 56.2
   640x480 59.9
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)

[Kent Baxley (kentb)]

My non-FHD unit (an older sputnik L322X) using the 1366x768 resolution seems to be working fine with an external monitor and the same kernel revision.

In this case I used a generic mini-dp to vga converter.

For mini-dp to HDMI, I aslo used a generic adapter and it also works fine with the non-FHD version of the sputnik machine with 3.8.0-27-generic #40-Ubuntu SMP.

[Riccardo Rossi (rrossi)]

this also affects my ivy bridge i7 sputnik upgraded to ubuntu 13.10

xrandr -q
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 294mm x 165mm
   1920x1080 60.0*+ 59.9 40.0
   1680x1050 60.0 59.9
   1600x1024 60.2
   1400x1050 60.0
   1280x1024 60.0
   1440x900 59.9
   1280x960 60.0
   1360x768 59.8 60.0
   1152x864 60.0
   1024x768 60.0
   800x600 60.3 56.2
   640x480 59.9
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 13.10
Release: 13.10
Codename: saucy