нужно настроитьмонитор LG 795FT

Попробуй программу gtf

gtf 1152 864 100

# 1152x864 @ 100.00 Hz (GTF) hsync: 91.50 kHz; pclk: 143.47 MHz
Modeline "1152x864_100.00" 143.47 1152 1232 1360 1568 864 865 868 915 -HSync +Vsync

### BEGIN DEBCONF SECTION
# XF86Config-4 (XFree86 server configuration file) generated by dexconf, the
# Debian X Configuration tool, using values from the debconf database.
#
# Edit this file with caution, and see the XF86Config-4 manual page.
# (Type "man XF86Config-4" at the shell prompt.)
#
# If you want your changes to this file preserved by dexconf, only make changes
# before the "### BEGIN DEBCONF SECTION" line above, and/or after the
# "### END DEBCONF SECTION" line below.
#
# To change things within the debconf section, run the command:
# dpkg-reconfigure xserver-xfree86
# as root. Also see "How do I add custom sections to a dexconf-generated
# XF86Config or XF86Config-4 file?" in /usr/share/doc/xfree86-common/FAQ.gz.

Section "Files"
FontPath "unix/:7100" # local font server
# if the local font server has problems, we can fall back on these
FontPath "/usr/lib/X11/fonts/misc"
FontPath "/usr/lib/X11/fonts/cyrillic"
FontPath "/usr/lib/X11/fonts/100dpi/:unscaled"
FontPath "/usr/lib/X11/fonts/75dpi/:unscaled"
FontPath "/usr/lib/X11/fonts/Type1"
FontPath "/usr/lib/X11/fonts/Speedo"
FontPath "/usr/lib/X11/fonts/100dpi"
FontPath "/usr/lib/X11/fonts/75dpi"
FontPath "/usr/lib/X11/fonts/TrueType"
EndSection

Section "Module"
# Load "GLcore"
Load "bitmap"
Load "dbe"
Load "ddc"
# Load "dri"
Load "extmod"
Load "freetype"
Load "glx"
Load "int10"
# Load "pex5"
Load "record"
Load "speedo"
Load "type1"
Load "vbe"
# Load "xie"
EndSection

Section "InputDevice"
Identifier "Generic Keyboard"
Driver "keyboard"
Option "CoreKeyboard"
Option "XkbRules" "xfree86"
Option "XkbModel" "pc104"
Option "XkbLayout" "ru"
Option "XkbVariant" "winkeys"
Option "XkbOptions" "grp:ctrl_shift_toggle,grp_led:scroll"
EndSection

Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
Option "Device" "/dev/psaux"
Option "Protocol" "ImPS/2"
Option "Emulate3Buttons" "true"
Option "ZAxisMapping" "4 5"
EndSection

#Section "InputDevice"
# Identifier "Generic Mouse"
# Driver "mouse"
# Option "SendCoreEvents" "true"
# Option "Device" "/dev/input/mice"
# Option "Protocol" "ImPS/2"
# Option "Emulate3Buttons" "true"
# Option "ZAxisMapping" "4 5"
#EndSection

Section "Device"
Identifier "Generic Video Card"
Driver "nvidia"
EndSection

Section "Monitor"
Identifier "Generic Monitor"
HorizSync 30-96
VertRefresh 50-160
Option "DPMS"
Option "NvAGP" "1"
Option "CursorShadow" "Yes"
Option "NoLogo" "Yes"
ModeLine "1024x768@100" 113.35 1024 1072 1264 1392 768 771 781 814 +HSync +VSync
ModeLine "1152x864@100" 143.47 1152 1232 1360 1568 864 865 868 915 -HSync +VSync
# Testing Options
# Option "RenderAccel" "Yes"
# Option "CursorShadowAlpha" "64"
# Option "ConnectedMonitor" "CRT"

EndSection

Section "Screen"
Identifier "Default Screen"
Device "Generic Video Card"
Monitor "Generic Monitor"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1152x864" "1024x768" "800x600"
EndSubSection
SubSection "Display"
Depth 4
Modes "1152x864" "1024x768" "800x600"
EndSubSection
SubSection "Display"
Depth 8
Modes "1152x864" "1024x768" "800x600"
EndSubSection
SubSection "Display"
Depth 15
Modes "1152x864" "1024x768" "800x600"
EndSubSection
SubSection "Display"
Depth 16
Modes "1152x864" "1024x768" "800x600"
EndSubSection
SubSection "Display"
Depth 24
# Modes "1024x768" "800x600"
Modes "1280x1024" "1024x768" "800x600"
EndSubSection
# SubSection "Display"
# Depth 24
# Modes "1280x1024" "1024x768" "800x600"
# EndSubSection
EndSection

Section "ServerLayout"
Identifier "Default Layout"
Screen "Default Screen"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
# InputDevice "Generic Mouse"
EndSection

Section "DRI"
Mode 0666
EndSection

Все это криво. Моник такой-же как и у тебя. больше 1024x768 смысла нет.

***

Section "Monitor"
Identifier "Generic Monitor"
HorizSync 30-96
VertRefresh 50-160
Option "DPMS"
Option "NvAGP" "1"
Option "CursorShadow" "Yes"
Option "NoLogo" "Yes"

***
SubSection "Display"
Depth 24
Modes "1024x768" "800x600"
# Modes "1280x1024" "1024x768" "800x600"
EndSubSection

параметры:
http://www.lg.ru/products/monitors/flatron/795ftplus/

Я использую Modes "1280x1024@85", но и та что у тебя в виндах держится 1152x864@100Hz тоже будет работать