проблема решена удалить файл /etc/X11/xorg.conf.d/10-monitor.conf после покрахтел и появилась kde4! спасибо за помош! да и кстати надо было такой вариант ошибки при смене разрешения в фак записать а то там ни слово про это!
Но не для всех,
cat /var/log/Xorg.0.log|head -n 137|tail -n 14
[244623.042] (**) NVIDIA(0): Using HorizSync/VertRefresh ranges from the EDID for display
[244623.042] (**) NVIDIA(0): device LG Electronics L1953S (CRT-1) (Using EDID
[244623.042] (**) NVIDIA(0): frequencies has been enabled on all display devices.)
[244623.044] (II) NVIDIA(0): Validated MetaModes:
[244623.044] (II) NVIDIA(0): "CRT-1:1280x1024"
[244623.044] (II) NVIDIA(0): "CRT-1:1024x768"
[244623.044] (II) NVIDIA(0): "CRT-1:800x600"
[244623.044] (II) NVIDIA(0): "CRT-1:640x480"
[244623.044] (II) NVIDIA(0): Virtual screen size determined to be 1280 x 1024
[244623.080] (--) NVIDIA(0): DPI set to (95, 96); computed from "UseEdidDpi" X config
[244623.081] (--) NVIDIA(0): option
[244623.081] (--) Depth 24 pixmap format is 32 bpp
[244623.081] (II) NVIDIA: Using 768.00 MB of virtual memory for indirect memory access.
[244623.087] (II) NVIDIA(0): Setting mode "CRT-1:1280x1024"
xrandr
Screen 0: minimum 8 x 8, current 1280 x 1024, maximum 8192 x 8192
DVI-I-0 disconnected primary (normal left inverted right x axis y axis)
DVI-I-1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 338mm x 270mm
1280x1024 60.0*+ 75.0
1024x768 75.0 60.0
800x600 75.0 60.3
640x480 75.0 59.9
TV-0 disconnected (normal left inverted right x axis y axis)
DVI-I-2 disconnected (normal left inverted right x axis y axis)
DVI-I-3 disconnected (normal left inverted right x axis y axis)
# lspci -k|grep -A2 VGA
01:00.0 VGA compatible controller: NVIDIA Corporation G84 [GeForce 8600 GTS] (rev a1)
Subsystem: Micro-Star International Co., Ltd. [MSI] Device 0891
Kernel driver in use: nvidia
cat /etc/X11/xorg.conf.d/10-monitor.conf
# Generated by xsetup
Section "Monitor"
Identifier "Monitor0"
EndSection
Section "Device"
Identifier "Card0"
# Driver "nouveau"
Driver "nvidia"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Modes "1280x1024" "1024x768" "800x600" "640x480"
Depth 24
EndSubSection
EndSection
а персонально для случая.