Firstable sorry about my english
I have updated from 10.6.2 to 10.6.4 and I have my Ati 4550 HD working perfect QE and CI with VGA or DVI (or both BUT using the same resolution )
To see how, just follow the steps of Azuma111 on: scrow down to find the post with the red text - Azuma111's post
-The post is for ATI HD4650 but I'm sure, if you do follow those steps (sure using the Ati4500Controler.kext)you will have your video working
I have tried with 'Mac Os Snow 10.6.2 v 3.6 Universal' & 'Mac OS Snow 10.6.2 Hazard' AND THEY Both updates and working with my Card
-To update from those/both versions to 10.6.4 using "Software Update" FIRST REMOVE the sleepenabler.kext from
/System/LibraryExtensions.
-To have the sleepfunction back just download: sleepenabler 10.6.4 once you have updated.
ONCE YOU HAVE updated PROBABLY WILL HAVE TO USE -x to boot in safe mode and install all those kexts , edin the com.apple.Boot.plist install the new 10.6.4 sleepenabler.kext too.
I HAVE THE PAKAGE FOR Ati 4550 HD (all the kexts needed and the edited apple.com.boot.plist too) IF ANY WANT THEM just PM me or ask to send you those files on mtdmtdv@gmail.com
-you will have just to: booting with -x in case your video not working, install those kexts in already updated 10.6.4, replace com.apple.Boot.plist and RESTART with -f -v.
The package
for_10.6.4_just_instal_and_replace.zip 2.33MB
1175 downloadsYour Ati will be detected like an ATI Radeon HD 4890.
Good Luck



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