11.3: External Monitor on Dell laptop

English Install/Boot/Login
1

Hello

I have Dell Vostro 3300 with Intel HD integrated graphic card and Samsung SyncMaster 2343BW external monitor.

This is the output of xrandr:

creen 0: minimum 320 x 200, current 2048 x 1152, maximum 8192 x 8192
VGA1 connected 2048x1152+0+0 (normal left inverted right x axis y axis) 510mm x 287mm
2048x1152 59.9*+
1680x1050 60.0
1280x1024 60.0
1440x900 59.9
1280x960 60.0
1280x800 59.8
1024x768 60.0
800x600 60.3 56.2
640x480 60.0
LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 293mm x 164mm
1366x768 60.0*+ 40.0
1024x768 60.0
800x600 60.3 56.2
640x480 59.9

It runs on 2048x1152 full resolution, however, the picture on the monitor is blurry, it vibrates and looks like old TV with interlacing.
I tried to disable output to LVDS screen on laptop using xrandr but it doesn’t help/

Previously I had HP laptop with integrated Intel and OpenSuse 11.0 and the external screen worked normally.

Any recommendations?

Thanks in advance!

2

I know it’s not perfect solution (if any), but did your try to lower the resolution on the VGA1? Those synch frequencies 59.9 looks very odd to me.

3

Hi,
could you tell us which model you have, with or without an additional Nvidia card :
Please type :
lspci | grep -i vga

and post result here.

You don’t seem to be alone in having the problem :

GMA 5700 MHD Dell Vostro 3300 externel vga monitor is flickering - Ask Ubuntu - Stack Exchange

HTH

Lenwolf

4

Hi and thanks for fast answers!

I tried to find a solution to this problem in the last several days but could not anything related.

The output of lspci is as follows:

00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 12)

It is Intel i3 CPU with integrated graphics, namely Intel HD.

I tried also to change resolution but it stills flicker… looks like the pixels are on the wave…

Regards
Milos

5

Hi,
have you tried this with another OS, to see whether the problem is there also?
IIRC, VGA at these high resolutions can be quite dodgy. When you say that you changed the resolution, to what did you lower it? Go for something like SVGA, to see what that brings.

HTH

Lenwolf

6

Yes I tried with all the modes … and 800x600 looks the best but flickering is still there. I tried also to disable primary lvds but it doesnt helps. Everything works well under windows 7.
I dont think VGA in this case has something to do with real VGA… it is just analog output at the laptop and related designation.

Regards
Milos

7

Try different X manager: kde,gnome,lxde. You can also disable desktop effects (compiz) as well. Other things, that comes to mind at the moment: look at the files in the /etc/X11/xorg.conf directory - maybe there is some weird? And of course you did use the auto settings in you external monitor?
I had also problem with something like a wave on the external screen - if your monitor has VGA and DVI input try the other one than your using now.

8

I think you should be using the LVDS (for LCD monitors) and not the VGA (for CRT). That said you need to synchronize your laptop output to the presets for your monitor. More than likely your optimal resolution is 1920x1080. Some monitor and video adapters can display higher resolutions flawlessly but some may not. In addition, you may need to lower the refresh rates.

In my case, whenever I connect my monitor to a VGA adapter the operating system assumes a CRT. I have to add the actual default LCD resolution I want, either by xorg or nVidia/ATI setup programs.