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Old 02-12-2004, 11:36 PM   #1
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Screen Resolution Problem with Redhat 9

I am new to Linux , I recently installed Redhat linux 9 with windows XP dual booting on my Dell 2400 PC. Installation went well, but the sceens are too big to fit in monitor. Scrrens not fitting in monitor window. Labels over lap on login screen also.

I feel problem is with resolutions. I tried to for various resolution modes graphilly but it seems it is taking only 640x480 as i got this from physical monitor adjustment window. If i edited and remove the 640x480, my X window not starting and probing and asking me to select resolution.

MY Monitor is Dell E773c with windows 1024 X 768 resolution and Intel 82845 G/GL/.... video card.
I appreciate for your help.
with regards,

Last edited by venkatm; 02-13-2004 at 05:26 PM.
Old 02-13-2004, 06:24 PM   #2
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Most likely you haven't configured the hsync and vsync refresh rates properly. Have you tried running the Redhat xconfig again or tried xf86config to reconfigure X?
Old 02-13-2004, 10:19 PM   #3
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Thak you, i am enclosing the config file here for your ref.

# XFree86 4 configuration created by redhat-config-xfree86

Section "ServerLayout"
Identifier "Default Layout"
Screen 0 "Screen0" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "DevInputMice" "AlwaysCore"

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/psaux"
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 "DELL E773c"
DisplaySize 320 240
HorizSync 30.0 - 70.0
VertRefresh 50.0 - 160.0
Option "dpms"

Section "Device"
Identifier "Videocard0"
Driver "i810"
VendorName "Videocard vendor"
BoardName "Intel 845"

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 16
SubSection "Display"
Depth 16
Modes "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"

Section "DRI"
Group 0
Mode 0666
Old 02-14-2004, 06:58 AM   #4
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In the section screen (of above config file) try reducing the value. it should look like this,
Modes "1024x768" "800x600" "640x480".
try deleting the first value if u still didn't get correct resolution.
otherwise start the terminal as root & run 'setup' (without qoutes). there choose display related configuration & configure it.
Old 02-14-2004, 08:43 PM   #5
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I changed the modes to above 3 only.But of no use. setup does not have an option to change display.
Old 02-15-2004, 06:37 AM   #6
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I've just changed my screen resolution from 800x600 to 1024x768.
First time I attempted to do it edit the config file and change it directly prepending 1024x768, without changing the vertical and horizontal frequencies, and resolution remained unchanged after reboot.
Finally I changed the resolution, using the desktop toolbar: System Settings -> Display,
changing the resolution to 1024x768 and also the screen refresh frequencies to the vendor's values , according to my monitor user guide , clicking on the Advanced tab.
The frequency values guessed by redhat where different from the real monitor capabilities.
That may be the point that prevents you from getting the right resolution.
I hope that will help you ,
Old 02-20-2004, 09:29 AM   #7
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i got solution, the problem is with frame buffer size in bios, it is 1 mb, i changed it to 8 mb, now i am able to get required resolution.
Thank you. Thanks for your advices.
Old 03-13-2004, 07:28 PM   #8
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cannot set resolution

Hello, how did you change the frame buffer size? Thanks.


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