Changing Refresh Rates
Patrick Ryan Vinson
pvinson at fit.edu
Fri Dec 3 04:24:31 UTC 2004
Hello Everyone,
Well, I dove into the LCD Monitor world. I will have to say that I am
very pleased. There is one thing though that I am trying to figure out.
The LCD Monitor that I bought, LG Electronics L1710BK, is supposed to be
able to support 75Hz at 1280x1024. When X starts, it only goes to 60Hz.
Now, if I change the resoultion down to 1024x768 I do get 75Hz.
Thinking I would be smart and trick Xorg, I changed the VertRefresh line
to 75.0 - 75.0 just to see. However, it ended up tricking me by falling
to 1024x768 resoultion. I then decided, well maybe it really can't
handle 75Hz at 1280x1024 and so I did a bit more research. However,
every spec sheet I can find on this monitor says it can handle 75Hz at
this resoultion.
My question, is there a way that I can change the refresh rate to 75Hz
or should I take that when X starts up that it falls to 60Hz a sign? If
all these spec lists about this monitor is right I can handle this rate;
however, Xorg doesn't seem to think so.
If needed, here is my xorg.conf:
# Xorg configuration created by system-config-display
Section "ServerLayout"
Identifier "single head configuration"
Screen 0 "Screen0" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
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"
EndSection
Section "Module"
Load "dbe"
Load "extmod"
Load "fbdevhw"
Load "glx"
Load "record"
Load "freetype"
Load "type1"
#Load "dri"
EndSection
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 "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "yes"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "LG Electronics"
ModelName "L1710BK"
HorizSync 30.0 - 83.0
VertRefresh 56.0 - 75.0
Option "dpms"
EndSection
Section "Device"
Identifier "Videocard0"
Driver "nvidia"
VendorName "NVidia"
BoardName "NVIDIA GeForce 4 TI4600
EndSection
Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x1024" "1024x768" "800x600"
EndSubSection
EndSection
Section "DRI"
Group 0
Mode 0666
EndSection
===================
Thank you for your time.
- Patrick
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