I'm trying to get a display mode of 1280x768.

I'm using Mandrake 10.1, an NVIDIA card and a Samsung SyncMaster 730MW LCD TV monitor.

I've tried a few things and I can get a scrolling window but I can't get 1280x768 on the screen, but I can in Windows.

Can anyone help out on this, I'd really appreciate it. I've editted the XF86Config file and stuff, but nothing seems to quite work.

Have you already installed he correct NVIDIA driver from their website? If not, you might want to try that first.

Yes, I got the nvidia driver from their website and did all that installing and stuff. But I still don't get 1280x768 mode

And to forestall the next question, here's the XF86Config file I'm using. I'd appreciate any helpful hints!

# File generated by XFdrake.

# **********************************************************************
# Refer to the XF86Config man page for details about the format of
# this file.
# **********************************************************************

Section "Files"
# Multiple FontPath entries are allowed (they are concatenated together)
# By default, Mandrake 6.0 and later now use a font server independent of
# the X server to render fonts.
FontPath "unix/:-1"
EndSection

Section "ServerFlags"
#DontZap # disable <Crtl><Alt><BS> (server abort)
#DontZoom # disable <Crtl><Alt><KP_+>/<KP_-> (resolution switching)
AllowMouseOpenFail # allows the server to start up even if the mouse doesn't work
EndSection

Section "Module"
Load "dbe" # Double-Buffering Extension
Load "v4l" # Video for Linux
Load "extmod"
Load "type1"
Load "freetype"
Load "glx" # 3D layer
EndSection

Section "InputDevice"
Identifier "Keyboard1"
Driver "keyboard"
Option "XkbModel" "pc105"
Option "XkbLayout" "gb"
Option "XkbOptions" ""
EndSection

Section "InputDevice"
Identifier "Mouse1"
Driver "mouse"
Option "Protocol" "ExplorerPS/2"
Option "Device" "/dev/mouse"
Option "ZAxisMapping" "6 7"
EndSection

Section "Monitor"
Identifier "monitor1"
VendorName "Samsung"
ModelName "Samsung SyncMaster 750(M)b"
HorizSync 30-70
VertRefresh 50-160

# Sony Vaio C1(X,XS,VE,VN)?
# 1024x480 @ 85.6 Hz, 48 kHz hsync
ModeLine "1024x480" 65.00 1024 1032 1176 1344 480 488 494 563 -hsync -vsync

# Dell D800 and few Inspiron (16/10) 1280x800
ModeLine "1280x800" 147.89 1280 1376 1512 1744 800 801 804 848

# Dell D800 and few Inspiron (16/10) 1680x1050
ModeLine "1680x1050" 214.51 1680 1800 1984 2288 1050 1051 1054 1103

# Dell D800 and few Inspiron (16/10) 1920x1200
ModeLine "1920x1200" 230 1920 1936 2096 2528 1200 1201 1204 1250 +HSync +VSync

# TV fullscreen mode or DVD fullscreen output.
# 768x576 @ 79 Hz, 50 kHz hsync
ModeLine "768x576" 50.00 768 832 846 1000 576 590 595 630

# 768x576 @ 100 Hz, 61.6 kHz hsync
ModeLine "768x576" 63.07 768 800 960 1024 576 578 590 616
EndSection

Section "Device"
Identifier "device1"
VendorName "NVIDIA Corporation"
BoardName "NVIDIA GeForce FX (generic)"
Driver "nvidia"
Option "DPMS"
Option "NvAGP" "0"
EndSection

Section "Screen"
Identifier "screen1"
Device "device1"
Monitor "monitor1"
DefaultColorDepth 24
Subsection "Display"
Depth 16
Modes "1280x768" "800x600"
EndSubSection

Subsection "Display"
Depth 8
ViewPort 0 0
Virtual 1280 768
EndSubsection

Subsection "Display"
Depth 15
Virtual 1280 768
EndSubsection

Subsection "Display"
Depth 16
Virtual 1280 768
EndSubsection

Subsection "Display"
Depth 24
Virtual 1280 768
EndSubsection

Subsection "Display"
Depth 24
Modes "1280x768"
Viewport 0 0
Virtual 1280 768
EndSubsection

EndSection

Section "ServerLayout"
Identifier "layout1"
InputDevice "Keyboard1" "CoreKeyboard"
InputDevice "Mouse1" "CorePointer"
Screen "screen1"
EndSection

hi, not an expert at this, so make a backup copy of /etc/X11/Xorg.conf
(unless XF86Config is used).
Have you got an /etc/X11/Xorg.conf ?

Try xfdrake or drakx (cannot remember the name)
and choose a generic LCD display
Can you change the mode now?

Otherwise man xorg.conf
Your monitor section does not have 1280x768,
so that might be the problem

Further to that maybe you will find a clue in
/var/log/Xorg.0.log

Good luck

I'm guessing by your XF86Config file that you have a Dell D800? Perhaps this page might be of some value.

http://www.linux-on-laptops.com/dell.html

Thank you! Thank you all who helped!

No I don't have a Dell, that entry in the XF86Config was from trying to select a "next nearest" choice.

What I've done, is used gtf 1280 768 60 -x to create a modeline that was apparantly missing from the XF86Config file. This gave a working resolution of 1280x768 (Yah!), but it was a little low down: xvidtune allowed a change to the Vsync setting to get it in the right place.

Perfect! Thanks to everyone who helped! You guys rock

Glad you are sorted
even better that you posted how you did it.
Your linux future looks bright ;-), full of pixels

Enjoy Linux