Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

I have an HP Pavilion DM3-1120eb laptop with an Nvidia Geforce G105M graphic card, running a fresh Ubuntu 12.04 Precise Pangolin install. When connecting to a new Samsung S23B550 23 inch LCD monitor the HDMI will not work and the VGA connection will not allow for 1920*1080 resolution. The result is a small resolution (1024*768) that does not look good (fuzzy) and I cannot watch YouTube videos (the video box keeps on moving to the right and back) and the same flickering effect happens with droping menus and Google's suggestion box.

I've tried multiple solutions sugested in posts with no good result (including installing the drivers downloaded from the Nvidia page).

As far as I can guess, the problem is that the NVIDIA card is present but not recognized and thus the drivers do not work. Originally the drivers were installed (nvidia-current and the rest, all updated), but could not configure them with nvidia-config (says driver not present) and they did not show up with jockey-gtk. There's also been an error message about GLX not being present either. SCREENSHOT

For the HDMI the monitor says that there's no signal of MHL is not installed.

The computer is running now with no Nvidia drivers and no xorg.conf file (it gives me the best resolution). VGA will not even recognize the monitor as a 16:9.

This is the result of xrandr:

    Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192
LVDS2 connected 1024x768+0+0 (normal left inverted right x axis y axis) 293mm x 164mm
   1366x768       60.0 +
   1360x768       59.8     60.0  
   1024x768       60.0* 
   800x600        60.3     56.2  
   640x480        59.9  
VGA2 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768       60.0* 
   800x600        60.3     56.2  
   848x480        60.0  
   640x480        59.9  
DP1 disconnected (normal left inverted right x axis y axis)

lspci -v (only section about vga):

01:00.0 VGA compatible controller: NVIDIA Corporation G98M [GeForce G105M] (rev a2) (prog-if 00 [VGA controller])
    Subsystem: Hewlett-Packard Company Device 142e
    Flags: bus master, fast devsel, latency 0, IRQ 16
    Memory at f0000000 (32-bit, non-prefetchable) [size=16M]
    Memory at c0000000 (64-bit, prefetchable) [size=256M]
    Memory at d0000000 (64-bit, prefetchable) [size=32M]
    I/O ports at 4000 [size=128]
    Expansion ROM at f1080000 [disabled] [size=512K]
    Capabilities: <access denied>
    Kernel driver in use: nouveau
    Kernel modules: nvidia, nouveau, nvidiafb

Last xorg.conf (now removed):

    # nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 295.40  (buildmeister@swio-display-x86-rhel47-06.nvidia.com)  Thu Apr  5 22:40:54 PDT 2012

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"

Section "Files"

Section "InputDevice"

    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"

Section "InputDevice"

    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    HorizSync       28.0 - 33.0
    VertRefresh     43.0 - 72.0
    Option         "DPMS"

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    SubSection     "Display"
        Depth       24

nvidia-settings error:

![nvidia-settings error][2]

lshw -C video:

       description: VGA compatible controller
       product: G98M [GeForce G105M]
       vendor: NVIDIA Corporation
       physical id: 0
       bus info: pci@0000:01:00.0
       version: a2
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
       configuration: driver=nouveau latency=0
       resources: irq:16 memory:f0000000-f0ffffff memory:c0000000-cfffffff memory:d0000000-d1ffffff ioport:4000(size=128) memory:f1080000-f10fffff
       description: Display 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 bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:45 memory:f1400000-f17fffff memory:e0000000-efffffff ioport:50f0(size=8)
share|improve this question

4 Answers 4

Your problem is that you have 2 video cards: the GeForce G105M and the intel Integrated one. It's called "Nvidia Hybrid Graphics" and it's a nightmare under Linux.

Your only solution is to disable one of the GPU and then install the correct driver for the other one. If you disable the nVidia GPU (my suggestion), you will have better battery life and it will work out-of-the-box but you will get worse 3D performance in games and WebGL. If you disable the Intel GPU, you'll need to install the nVidia proprietary drivers (they don't use XrandR and they need a proper Xorg.conf file).

To switch to a single GPU, you have 2 options: 1) Select the GPU in the HP BIOS, if there is such an option. Maybe upgrade to the latest BIOS first to be sure. 2) If there is no such option, follow these instructions on the Ubuntu wiki: https://help.ubuntu.com/community/HybridGraphics

Hope this helps :)

share|improve this answer
Thanks Christophe. I have no option to disable the intel card in the Bios. Trying out the link's solution. –  Ramon Suarez May 20 '12 at 12:05
I cannot proceed with the solution in that page. vgaswitchero is present:grep -i switcheroo /boot/config-3.2.* CONFIG_VGA_SWITCHEROO=y and sudo ls -l /sys/kernel/debug/vgaswitcheroo/switch -rw-r--r-- 1 root root 0 May 20 10:57 /sys/kernel/debug/vgaswitcheroo/switch but when I do `sudo echo ON > /sys/kernel/debug/vgaswitcheroo/switch" I get a permission denied message. –  Ramon Suarez May 20 '12 at 12:41
Found some info about the permission problem here: http://askubuntu.com/questions/20578/sudo-redirect-output Don't understand it right now. –  Ramon Suarez May 20 '12 at 13:02
Tried Bumblebee to see if my computer could be one of the "legacy" Optimus.Nothing changed in terms of display, but I could launch individual apps and it did change something after a bit of black screen, but had same resolution. So I uninstalled it and now the /sys/kernel/debug/vgaswitcheroo/switchfile is missing. –  Ramon Suarez May 20 '12 at 14:04
up vote 2 down vote accepted

I've found a solution writing a script that adapts the resolution each time I login.

To make my life easier I had swapped monitors with the one I hook to my other laptop at my coworking space (that one detects the new monitor in both VGA and HDMI).

First I searched for my monitor's specifications using Google to figure out the optimal resolution, using these keywords: syncmaster t220 specs. This is the first bit of information I needed: Native Resolution 1680 x 1050 at 60 Hz.

Then I opened a terminal and used cvt to get the correct mode to add:

cvt 1680 1050

This is the result:

# 1680x1050 59.95 Hz (CVT 1.76MA) hsync: 65.29 kHz; pclk: 146.25 MHz
Modeline "1680x1050_60.00"  146.25  1680 1784 1960 2240  1050 1053 1059 1089 -hsync +vsync

The part that maters comes right after Modeline. To copy in the terminal you highlight the text that matters with your mouse and then press Ctrl+Shift+c, and to paste Ctrl+Shift+v. You can open a couple terminals if you feel more comfortable.

Then I used the simple text editor nano (you can also use gedit or any other simple text editor) and added the following:

xrandr --newmode "1680x1050_60.00"  146.25  1680 1784 1960 2240  1050 1053 1059 1089 -hsync +vsync
xrandr --addmode VGA1 1680x1050_60.00
xrandr --output VGA1 --mode 1680x1050_60.00

As you can see I directly pasted the result of cvt after xrandr --newmode to create the new mode I want to use. Then I use the content within the brackets into the next two lines.

Notice that I used VGA1 for the output, but you can also use HDMI or whatever else you have connected. To find out the names of the devices just run xrandr without any parameters. In my case, the laptop's screen is called LVDS1.

Then I saved the file and exited (the commands are in the bottom of nano's screen, the ^ symbol means to use the Ctrl key in combination with whatever comes after it.) The name of the file does not matter, just make it something that will help you identify it later on (like, months after when you don't remember how you fixed your problem.)

After that I changed the permissions of the file so that it could be executed:

chmod +x activate-resolution-t220

You can also add execute permission using the file browser, right-clicking on it, selecting properties, the Permissions tab and then marking the tick box to the left of Allow executing file as program.

Running the file will change your monitor resolution:


Usually if you start typing the ./ and the beginning of the name of your file and hit the Tab key, the name of your file will be automatically written for you. If it is only part of it, then there's another file that shares that part as the beginning of their name and you have to add some more characters to help the computer see the one you mean and hit Tab again.

To execute it automatically every time I log in I just opened Startup Applications (in the Dash start typing startup and the icon will show right away), clicked on Add, clicked on Browse, looked for my file, clicked Open, and finally clicked Add.

Now every time I log in, my monitor displays the right resolution :)

If you like this answer and find it useful, please vote it up!

share|improve this answer

You might need to set the perms on the file first. See for ex.

How do I turn off the Radeon GPU ono my HP Pavilion DM4?

share|improve this answer
Thanks Alexis. In the meantime I've deleted the file by installing and uninstalling Bumblebee. How can I rebuild it? –  Ramon Suarez May 20 '12 at 15:32

Found a temporary solution here: http://ubuntuforums.org/showthread.php?t=1364460 The problem is that I cannot make it permanent. From step #6 it talks about edition sudo gedit /etc/gdm/Init/Default but the file is no longer in use in Unity with lightdm. Do you guys know where I should make the changes to make it permanent?

Edit I think the solution to make it permanent may be here How to force Multiple Monitors correct resolutions for LightDM?.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.