Debian + Dell + double screen

Hi all,

I've just installed a debian lxde 7.4 on my dell optiplex 9020.

I would like to install 2 screens, but only one is recognize.

Here are some infos on my system. Do you have any idea ???

I think about upgrading the stable kernel with the testing kernel. I don't know if it's a good idea !!!

Regards,

Benjamin

$ uname -a
Linux bdedardel-pc 3.2.0-4-amd64 #1 SMP Debian 3.2.54-2 x86_64 GNU/Linux

$ lspci -nn | grep VGA
00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell Integrated Graphics Controller [8086:0412] (rev 06)

$ xrandr -q
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 1920 x 1080, maximum 1920 x 1080

default connected 1920x1080+0+0 0mm x 0mm
1920x1080 0.0*
1280x1024 0.0
1024x768 0.0
800x600 0.0

640x480 0.0

$ sudo xresprobe -h
id: DELL P2314H
res: 1920x1200 1920x1080 1600x1000 1280x1024 1152x864 1024x768 800x600 720x400 640x480

freq: 30-83 56-76
disptype: lcd/tmds

$ sudo ddcprobe -h
vbe: VESA 3.0 detected.

oem: Intel(R) HSW Mobile/Desktop Graphics Chipset Accelerated VGA BIOS
vendor: �
product: �� 
memory: 32704kb

mode: 1280x1024x256
mode: 1280x1024x64k
mode: 1280x1024x16m
mode: 1024x768x256
mode: 1024x768x64k

mode: 1024x768x16m
mode: 640x480x16m
mode: 800x600x64k
mode: 800x600x16m
mode: 640x480x256

mode: 800x600x256
mode: 640x480x64k
edid:
edid: 1 4
id: 4098
eisa: DEL4098

serial: 41585553
manufacture: 47 2013
input: composite sync, digital signal.
screensize: 51 29
gamma: 2.200000
dpms: RGB, active off, no suspend, no standby
timing: 720x400@70 Hz (VGA 640x400, IBM)
timing: 640x480@60 Hz (VGA)

timing: 640x480@75 Hz (VESA)
timing: 800x600@60 Hz (VESA)
timing: 800x600@72 Hz (VESA)
timing: 800x600@75 Hz (VESA)

timing: 1024x768@87 Hz Interlaced (8514A)
timing: 1024x768@75 Hz (VESA)
ctiming: 1152x864@75
ctiming: 1280x1024@60

ctiming: 1600x1000@60
ctiming: 1920x1200@60
dtiming: 1920x1080@67
monitorserial: J8J313BKAXUS
monitorname: DELL P2314H
monitorrange: 30-83, 56-76

$ sudo inteltool -a
Intel CPU: Family 6, Model c

Intel Northbridge: 8086:0c00 (unknown)
Intel Southbridge: 8086:8c4e (unknown)

============= GPIOS =============

Error: Dumping GPIOs on this southbridge is not (yet) supported.

============= RCBA ==============

Error: Dumping RCBA on this southbridge is not (yet) supported.

============= PMBASE ============

Error: Dumping PMBASE on this southbridge is not (yet) supported.

============= MCHBAR ============

Error: Dumping MCHBAR on this northbridge is not (yet) supported.

============= EPBAR =============

Error: Dumping EPBAR on this northbridge is not (yet) supported.

============= DMIBAR ============

Error: Dumping DMIBAR on this northbridge is not (yet) supported.

========= PCIEXBAR ========

Error: Dumping PCIEXBAR on this northbridge is not (yet) supported.

Error: Dumping MSRs on this CPU (0x0006c0) is not (yet) supported.