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Old 03-14-2004, 08:26 PM   #1
Registered: Oct 2003
Distribution: Ubuntu 11.10
Posts: 38

Rep: Reputation: 15
Screen shakes at higher resolutions


I've been having this problem for quite some time and I've posted questions looking for some answers, but this has never been resolved. I am running Fedore Core with an NVIDIA GeForce2 32M graphics card with a SONY CDP200ES 17" monitor. The max res on this monitor should be 1280 x 1024. I am pretty sure I have the video card set up right (I get a nice NVIDIA splash screen these days).

My problem is that I cannot set the monitor res higher than 1024x768. If I do, the screen starts shaking. Not too much, but enough to seriously annoy. I want to have the resolution at at 1152x864. Here is my XF86Config file when the shaking starts:

# XFree86 4 configuration created by redhat-config-xfree86

Section "ServerLayout"
Identifier "single head configuration"
Screen 0 "Screen0" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"

Section "Files"

# RgbPath is the location of the RGB database. Note, this is the name of the
# file minus the extension (like ".txt" or ".db"). There is normally
# no need to change the default.
# Multiple FontPath entries are allowed (they are concatenated together)
# By default, Red Hat 6.0 and later now use a font server independent of
# the X server to render fonts.
RgbPath "/usr/X11R6/lib/X11/rgb"
FontPath "unix/:7100"

Section "Module"
Load "dbe"
Load "extmod"
Load "fbdevhw"
Load "glx"
Load "record"
Load "freetype"
Load "type1"

Section "InputDevice"

# Specify which keyboard LEDs can be user-controlled (eg, with xset(1))
# Option "Xleds" "1 2 3"
# To disable the XKEYBOARD extension, uncomment XkbDisable.
# Option "XkbDisable"
# To customise the XKB settings to suit your keyboard, modify the
# lines below (which are the defaults). For example, for a non-U.S.
# keyboard, you will probably want to use:
# Option "XkbModel" "pc102"
# If you have a US Microsoft Natural keyboard, you can use:
# Option "XkbModel" "microsoft"
# Then to change the language, change the Layout setting.
# For example, a german layout can be obtained with:
# Option "XkbLayout" "de"
# or:
# Option "XkbLayout" "de"
# Option "XkbVariant" "nodeadkeys"
# If you'd like to switch the positions of your capslock and
# control keys, use:
# Option "XkbOptions" "ctrl:swapcaps"
# Or if you just want both to be control, use:
# Option "XkbOptions" "ctrl:nocaps"
Identifier "Keyboard0"
Driver "keyboard"
Option "XkbRules" "xfree86"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"

Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "no"

Section "InputDevice"

# If the normal CorePointer mouse is not a USB mouse then
# this input device can be used in AlwaysCore mode to let you
# also use USB mice at the same time.
Identifier "DevInputMice"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "no"

Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "Sony CPD-200ES"
DisplaySize 330 240
HorizSync 30.0 - 70.0
VertRefresh 50.0 - 120.0
Option "dpms"

Section "Device"
Identifier "Videocard0"
Driver "nvidia"
VendorName "Videocard vendor"
BoardName "NVIDIA GeForce 2 MX (generic)"

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1152x864" "1024x768" "800x600" "640x480"

Section "DRI"
Group 0
Mode 0666

If I set the res at 1024x768, there is no shaking and the XF86Config file looks the same except for the fact that 1152x864 is missing. Any thoughts on how I can make the 1152x864 resolution work? Thanks in advance for any advice . . .
Old 03-14-2004, 08:56 PM   #2
Registered: Mar 2004
Posts: 30

Rep: Reputation: 16
Short answer: Aint gonna happen. No linux setting is gonna fix this.

Long answer:

Two (well three actually) things can cause the problem you are seeing.

1) Your video card may be defective. If it is putting out a bad signal, then there's nothing you can do. Doesn't happen often but...

2) Most likely you have a sh*ty cheap @ss video cable between your monitor and your box. If this is NOT the case then you have an enormous amount of interference... so the cable, though not sh*ty, is still not good enough. (Having a switchbox or extender contributes to this as well).

3) You may be running at a low refresh rate. High res @ 60hz will present the appearance of shaking.

My money is on (2)

-landrew the
Old 03-14-2004, 08:57 PM   #3
Senior Member
Registered: Dec 2003
Location: Shelbyville, TN, USA
Distribution: Fedora Core, CentOS
Posts: 1,019

Rep: Reputation: 45
Have you tried messing with your refresh frequency at all? I know that Fedora has an easy to use gui tool to change the resolution/refresh rate in its "fedora menu" somewhere.

Also, is the shaking bad? Sometimes electrical appliances will interfere with monitors. A fan or something like that too close to a monitor will cause the display to shake.


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