Ok then, a few things. 1> The IOProviderClass of the framebuffer MUST be the same as the IOClass of the EffectDriver, i.e. it is case sensitive. 2> You probabably don't need to have IOPCIMatch in your IOFrameBuffer personality. 3> Does your effect driver call 'registerService()' on itself? If I read these personalities correctly you wish to create a 'driver' stack on top of your 'EffectDriver'. The EffectDriver gets loaded when it identifies your hardware on the IOPCIDevice nub. Then at start time you want the Effect driver to load the relevant FrameBuffer driver. You achieve this by two steps. First setup a personality for the Framebuffer with a provider class of your EffectDriver real class name (I usually copy and paste). Then call at starttime have com_matrox_driver_Effects::start(provider) call registerService() just before returning. Godfrey At 14:18 -0400 02-5-30, Francis bouchard wrote: can we see the IOKitPersonalties? IOFrameBuffer: CFBundleIdentifier com.matrox.driver.Display IOClass com_matrox_driver_Display IOMatchCategory IOFrameBuffer (I don't know what IOMatch is for actually... Taken from sample) IOPCIMatch 0x... (our hadware) (this works for sure) IOProviderClass com_matrox_driver_effects EffectDriver CFBundleIdentifier com.matrox.driver.Effects IOClass com_matrox_driver_Effects IOMatchCategory Something (I don't know what IOMatch is for actually... Taken from sample) IOPCIMatch 0x... (our hadware) (this works for sure) IOProviderClass IOPCIDevice IOUserClientClass com_matrox_driver_EffectsUserClient On 30/05/02 14:06, "Godfrey van der Linden" <gvdl@apple.com> wrote: It depends on how you publish your com_matrox_EffectDriver (Note the prefix, this is really important quite a few drivers are going to have effects right?) No. one dirver handles all the effects needs (the different effects are done in userland... (KEEP OUT of the kernel!) How does the 'Effect Driver' get created? Buy the OS ??? At boot time. How does your FrameBuffer get created? Buy the OS ???. At boot time. Theses are in /System/Library/Extensions Thanks a lot for taking time Francis _______________________________________________ darwin-kernel mailing list | darwin-kernel@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.