1920X1080 resolution is missing in ubuntu 15.04

What is the output of:

sudo lshw -C display; lsb_release -a; uname -a; sudo dmidecode -t 1; xrandr

Thanks

Here is the output:

*-display
       description: VGA compatible controller
       product: Haswell-ULT Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 0b
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:46 memory:f7800000-f7bfffff memory:e0000000-efffffff ioport:f000(size=64)
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 15.04
Release: 15.04
Codename: vivid
Linux Terminatore 3.19.0-15-generic #15-Ubuntu SMP Thu Apr 16 23:32:37 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
# dmidecode 2.12
# SMBIOS entry point at 0x000f04c0
SMBIOS 2.7 present.

Handle 0x0001, DMI type 1, 27 bytes
System Information
 Manufacturer: Dell Inc.
 Product Name: Latitude E7440
 Version: 01
 Serial Number: 6BBMP12
 UUID: 4C4C4544-0042-4210-804D-B6C04F503132
 Wake-up Type: Power Switch
 SKU Number: Latitude E7440
 Family: Not Specified

Screen 0: minimum 8 x 8, current 1366 x 768, maximum 32767 x 32767
eDP1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 309mm x 173mm
   1366x768 60.1*+ 40.0
   1360x768 59.8 60.0
   1024x768 60.0
   800x600 60.3 56.2
   640x480 59.9
DP1 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)

I'm also wondering whether my video card supports 1920x1080 - i'm told that the dell E7440 comes with 2 different configs for LCD display - could mine be 1366x768?? I'm not sure

see http://askubuntu.com/questions/138408/how-to-add-display-resolution-fo-an-lcd-in-ubuntu-12-04-xrandr-problem and/or https://wiki.ubuntu.com/X/Config/Resolution

1. find out the resolutions that your screen hardware is capable of
2. convert the desired resolution/refresh rate into a modeline (with the cvt command), something like
cvt 1920 1080 60
3. define the resolution in xrandr (based on the output of the cvt command)
xrandr --newmode "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync
4. allow the eDP1 connection use that resolution
xrandr --addmode eDP1 "1920x1080_60.00"
5. switch to that resolution
xrandr --output eDP1 --mode "1920x1080_60.00"

(adapt the figures to your system!)
After a reboot the old resolution will be set again, if you want to make that permanent you have to add the information to system configuration files.

(credit to Manfred Hampl for this text)