[Mandrake 9.1] Refresh rate . 85Hz

Mi lahko kdo pove zakaj hudica mi MDK noce furat monitorja na 85hercih... v Mandrake control center sem 100x nastavil hsync in vsync pa ne dela... poedital sem tudi /etc/X11/XF86Config-4 takole:
------------------------
Section "Monitor"
Identifier "monitor1"
HorizSync 30.0 - 70.0
VertRefresh 60.0 - 150.0
Option "dpms"

# 1024x768@85Hz, 68.25 kHz hsync
ModeLine "1024x768" 84.46 1024 1048 1136 1296 768 771 773 803 -hsync -vsync
EndSection

Section "Device"
Identifier "device1"
VendorName "ST Microelectronics"
BoardName "KYRO Series"
Driver "fbdev"
Option "DPMS"
EndSection

Section "Screen"
Identifier "screen1"
Device "device1"
Monitor "monitor1"
DefaultColorDepth 16

Subsection "Display"
Depth 16
Modes "1024x768@85Hz"
EndSubsection
....
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pa se vedno ne dela... ko me vrze v runlevel 3 in se moram s "startx" vrniti v KDE, je se vedno 75Hz... pravzprav se zaslon sploh ne resetira tako kot v winsih (recimo da se ugasne in prizge v winsih ko menjasrefreshrate).

Imam Hercules 4000XT (KYRO 32MB) in LG Flatron 775FT.

Kaj mi je storiti?

Poglej v /var/log/XFree86.0.log kaj se dogaja. Ponavadi pise zakaj ne sprejme modelina.