GRUB_CMDLINE_LINUX="nomodeset"

GRUB_CMDLINE_LINUX="i915.modeset=1 i915.lvds_channel_mode=2 video=VGA-1:1280x1024Me video=LVDS-1:1024x768Me"

xrandr: Output LVDS1 is not disconnected but has no modes
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
LVDS1 connected (normal left inverted right x axis y axis)
VGA1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 477mm x 268mm
     1920x1080      60.0*+
     1680x1050      60.0
     1280x1024      75.0 60.0
     1440x900       59.9
     1280x960       60.0
     1024x768       75.1     70.1     60.0
     ...
     720x400        70.1
DP1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

$ xrandr --addmode LVDS1 1024x768

xrandr: Output LVDS1 is not disconnected but has no modes

echo -n "Release: " && lsb_release -sd && echo -n "Kernel: " || cat /etc/*release && uname -s -r && echo -n "Unity: " && unity --version && echo && /usr/lib/nux/unity_support_test -p -f && echo || echo &&  dpkg -s mesa-utils && echo || echo && echo "Xserver xorg core:" && apt-cache policy xserver-xorg-core | grep Installed && echo

Release: Ubuntu 14.04.1 LTS
Kernel: Linux 3.13.0-39-generic
Unity: The program 'unity' is currently not installed. You can install it by typing: sudo apt-get install unity

Package: mesa-utils
Status: install ok installed
Priority: optional
Section: x11
Installed-Size: 130
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Architecture: amd64
Source: mesa-demos
Version: 8.1.0-2
Replaces: xbase-clients (<< 6.8.2-38)
Depends: libc6 (>= 2.14), libgl1-mesa-glx | libgl1, libx11-6
Description: Miscellaneous Mesa GL utilities  This package provides several basic GL utilities built by Mesa, including  glxinfo and glxgears.
Original-Maintainer: Debian X Strike Force <debian-x@lists.debian.org>
Homepage: http://mesa3d.org/

Xserver xorg core:
   Installed: 2:1.15.1-0ubuntu2.1

~$ for p in /sys/class/drm/*/status; do con=${p%/status}; echo -n "${con#*/card?-}: "; cat $p; done

DP-1: disconnected
LVDS-1: connected
VGA-1: connected

~# cat /sys/kernel/debug/dri/0/i915_error_state
no error state collected
~# cat /sys/kernel/debug/dri/64/i915_error_state
no error state collected

00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) (prog-if 00 [VGA controller])
    Subsystem: Dell Device 02d8
    Flags: bus master, fast devsel, latency 0, IRQ 45
    Memory at f6c00000 (64-bit, non-prefetchable) [size=4M]
    Memory at e0000000 (64-bit, prefetchable) [size=256M]
    I/O ports at efe8 [size=8]
    Expansion ROM at <unassigned> [disabled]
    Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
    Capabilities: [d0] Power Management version 3
    Kernel driver in use: i915

00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
    Subsystem: Dell Device 02d8
    Flags: bus master, fast devsel, latency 0
    Memory at f6b00000 (64-bit, non-prefetchable) [size=1M]
    Capabilities: [d0] Power Management version 3

*-display:0
     description: VGA compatible controller
     product: Mobile 4 Series Chipset Integrated Graphics Controller
     vendor: Intel Corporation
     physical id: 2
     bus info: pci@0000:00:02.0
     version: 07
     width: 64 bits
     clock: 33MHz
     capabilities: msi pm vga_controller bus_master cap_list rom
     configuration: driver=i915 latency=0
     resources: irq:45 memory:f6c00000-f6ffffff memory:e0000000-efffffff ioport:efe8(size=8)
*-display:1 UNCLAIMED
     description: Display controller
     product: Mobile 4 Series Chipset Integrated Graphics Controller
     vendor: Intel Corporation
     physical id: 2.1
     bus info: pci@0000:00:02.1
     version: 07
     width: 64 bits
     clock: 33MHz
     capabilities: pm bus_master cap_list
     configuration: latency=0
     resources: memory:f6b00000-f6bfffff

~# for i in /sys/module/i915/parameters/*;do echo ${i}=`cat $i`;done

/sys/module/i915/parameters/disable_display=N
/sys/module/i915/parameters/disable_power_well=1
/sys/module/i915/parameters/disable_vtd_wa=N
/sys/module/i915/parameters/enable_cmd_parser=1
/sys/module/i915/parameters/enable_fbc=-1
/sys/module/i915/parameters/enable_hangcheck=Y
/sys/module/i915/parameters/enable_ips=1
/sys/module/i915/parameters/enable_ppgtt=0
/sys/module/i915/parameters/enable_psr=0
/sys/module/i915/parameters/enable_rc6=0
/sys/module/i915/parameters/fastboot=N
/sys/module/i915/parameters/invert_brightness=0
/sys/module/i915/parameters/lvds_channel_mode=2
/sys/module/i915/parameters/lvds_downclock=0
/sys/module/i915/parameters/lvds_use_ssc=-1
/sys/module/i915/parameters/modeset=1
/sys/module/i915/parameters/panel_ignore_lid=1
/sys/module/i915/parameters/powersave=1
/sys/module/i915/parameters/prefault_disable=N
/sys/module/i915/parameters/preliminary_hw_support=1
/sys/module/i915/parameters/reset=Y
/sys/module/i915/parameters/semaphores=-1
/sys/module/i915/parameters/vbt_sdvo_panel_type=-1

modeset:Use kernel modesetting [KMS] (0=DRM_I915_KMS from .config, 1=on, -1=force vga console preference [default]) (int)
panel_ignore_lid:Override lid status (0=autodetect, 1=autodetect disabled [default], -1=force lid closed, -2=force lid open) (int)
powersave:Enable powersavings, fbc, downclocking, etc. (default: true) (int)
semaphores:Use semaphores for inter-ring sync (default: -1 (use per-chip defaults)) (int)
enable_rc6:Enable power-saving render C-state 6. Different stages can be selected via bitmask values (0 = disable; 1 = enable rc6; 2 = enable deep rc6; 4 = enable deepest rc6). For example, 3 would enable rc6 and deep rc6, and 7 would enable everything. default: -1 (use per-chip default) (int)
enable_fbc:Enable frame buffer compression for power savings (default: -1 (use per-chip default)) (int)
lvds_downclock:Use panel (LVDS/eDP) downclocking for power savings (default: false) (int)
lvds_channel_mode:Specify LVDS channel mode (0=probe BIOS [default], 1=single-channel, 2=dual-channel) (int)
lvds_use_ssc:Use Spread Spectrum Clock with panels [LVDS/eDP] (default: auto from VBT) (int)
vbt_sdvo_panel_type:Override/Ignore selection of SDVO panel mode in the VBT (-2=ignore, -1=auto [default], index in VBT BIOS table) (int)
reset:Attempt GPU resets (default: true) (bool)
enable_hangcheck:Periodically check GPU activity for detecting hangs. WARNING: Disabling this can cause system wide hangs. (default: true) (bool)
enable_ppgtt:Override PPGTT usage. (-1=auto [default], 0=disabled, 1=aliasing, 2=full) (int)
enable_psr:Enable PSR (default: false) (int)
preliminary_hw_support:Enable preliminary hardware support. (int)
disable_power_well:Disable the power well when possible (default: true) (int)
enable_ips:Enable IPS (default: true) (int)
fastboot:Try to skip unnecessary mode sets at boot time (default: false) (bool)
prefault_disable:Disable page prefaulting for pread/pwrite/reloc (default:false). For developers only. (bool)
invert_brightness:Invert backlight brightness (-1 force normal, 0 machine defaults, 1 force inversion), please report PCI device ID, subsystem vendor and subsystem device ID to dri-devel@lists.freedesktop.org, if your machine needs it. It will then be included in an upcoming module version. (int)
disable_display:Disable display (default: false) (bool)
disable_vtd_wa:Disable all VT-d workarounds (default: false) (bool)
enable_cmd_parser:Enable command parsing (1=enabled [default], 0=disabled) (int)