[ltp] X flickering problem, Mdk 7.2, TP770ED

[Nico]

I installed  Mandrake 7.2 on the Tp770ED and the screen flickers.
This was not happening with Mandrake 7.1
With previous linux versions, I applied a manual reconfiguration to 
/etc/X11/XF86Config and the problem disappeared.


Please could someone point me *what* does make the screen flicker? 
Vertical/horizontal frequencies??

With Mandrake 7.2, through Xdrakes I set the following configurations:
- Trident cyber 9397 (generic)
- 1024x768  15 bits

but the problem is still there.
So tried moreover to apply these manual changes to /etc/X11/XF86Config :

==================================
Section "Monitor"
         Identifier      "TP770ED_LCD-1024x768"
         VendorName      "IBM"
         ModelName       "TP770Ed (14.1)"
         HorizSync       31.5-48.5
         VertRefresch    55-70
         Modeline        "1024x768"  60.00    1024 1032 1176 1344    768 771 
777 806  
-hsync -vsync
EndSection

Section "Device"
         Identifier      "TP770ED_XGA"
         VendorName      "IBM"
         BoardName       "TP770ED"
         Option          "accel"
         VideoRam        4096
EndSection

Section "Screen"
         Driver          "SVGA"
         Device          "TP770ED_XGA"
         Monitor         "TP770ED_LCD-1024x768"
         DefaultColorDepth 32
         Subsection "Display"
                 Depth   32
                 Modes   "1024x768"
                 ViewPort  0 0 
                 Virtual         1024  768
         EndsubSection
EndSection
=====================================

I also tried to adjust the Vertical/Horizontal frequencies in the 
/etc/XF86Config-4 file
HorizSync       31.5-48.5
VertRefresch    55-70

Is there something I'm missing?

Thanks in advance
Nico


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