Got it!
searched for
CUINotRequired in registry hive and it appears to be device specific. Im fine with that since it will only be done once. Now the igfxpanel fired up (after restart obviously) right after setting
CUINotRequired to "0" just like what you said, in
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0000 & HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001
Tried doing short benchmarks using novabench and it appears that enabling "software processing" in vertex mode does not do some magic anymore as much as it does in windows 7 and accdg to sites showing how to tweak intel gma.
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What took me by surprise is that "application settings," still an option in vertex mode, significantly increases the fps from the usual 28-32 in windos 7 to 29 to 56 here in windows 8! That's almost twice an increase I never thought it can ever get!
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Feels like some games that I can play pretty good in windows 7 does not do well here in windows 8 for some reason, though novebench tells otherwise. Glad windows 8 was able to utilize some hidden performance tweaks to get the best out of this poor fella.
Will try to do this with your mod driver and I'll conduct the same benchmark with the same settings and we'll see.