Yes, it's an EFI issue. As mentioned, graphics and audio issues aren't present, at least for me, when booting in non-EFI mode. EFI mode? Audio and graphics issues galore. I imagine that messing with the PCI register could get it all working, but that's difficult to mess with. An EFI update from Apple could possibly fix all of this.
It's all above, Apple cares about iOS and drop there standards for OS X. Intel last few years seems like they were pushing out products and letting customers pay them to beta test. Sandy Bridge and SATA III was nightmare and thunderbolt just now starting to see light of day and verdict still up in air on it. ATI should have never partner with AMD. Market so competitive for them to care about fixing any issue on old releases. There focus on getting the next line out. We customers are force to work with half-ass equipment....
Any chance you guys try AMD catalyst 12.12 (9.010.0) for Embedded GPU/APU-12.11.06
I have had chance to re-install W8 yet. I just notice this update.
;-----------------------------------------------
;----------1212031852-9.01-121106a-150333C-EDG_Direct
; ATI Display Information file : atiilhag.inf
;
; Installation INF for the ATI display driver.
; Copyright(C) 1998-2006 ATI Technologies Inc.
;-----------------------------------------------
; PX - PX Proxy mode
; PR - PX Proxy Ready
[Version]
Signature="$Windows NT$"
Provider=%ATI%
ClassGUID={4D36E968-E325-11CE-BFC1-08002BE10318}
Class=Display
DriverVer=11/06/2012, 9.010.0.0000 ----> Dated from November 6,2012
Supported products :
AMD6743.1 = "AMD Radeon E6760"
AMD9804.1 = "AMD Radeon HD 6250 Graphics"
AMD9805.1 = "AMD Radeon HD 6250 Graphics"
AMD9807.1 = "AMD Radeon HD 6290 Graphics"
AMD9803.1 = "AMD Radeon HD 6310 Graphics"
AMD9802.1 = "AMD Radeon HD 6320 Graphics"
AMD9806.1 = "AMD Radeon HD 6320 Graphics"
AMD6720.1 = "AMD Radeon HD 6900M Series"
AMD9994.1 = "AMD Radeon HD 7400G"
AMD99A4.1 = "AMD Radeon HD 7400G"
AMD9992.1 = "AMD Radeon HD 7420G"
AMD9993.1 = "AMD Radeon HD 7480D"
AMD990A.1 = "AMD Radeon HD 7500G"
AMD9919.1 = "AMD Radeon HD 7500G"
AMD9990.1 = "AMD Radeon HD 7520G"
AMD99A0.1 = "AMD Radeon HD 7520G"
AMD9991.1 = "AMD Radeon HD 7540D"
AMD9904.1 = "AMD Radeon HD 7560D"
AMD9908.1 = "AMD Radeon HD 7600G"
AMD9918.1 = "AMD Radeon HD 7600G"
AMD9907.1 = "AMD Radeon HD 7620G"
AMD9917.1 = "AMD Radeon HD 7620G"
AMD9903.1 = "AMD Radeon HD 7640G"
AMD9913.1 = "AMD Radeon HD 7640G"
AMD9901.1 = "AMD Radeon HD 7660D"
AMD9900.1 = "AMD Radeon HD 7660G"
AMD9910.1 = "AMD Radeon HD 7660G"
AMD6819.1 = "AMD Radeon HD 7800 Series"
AMD6800.1 = "AMD Radeon HD 7970M"
AMD6763.1 = "AMD Radeon HD6460"
AMD68B8.1 = "ATI Radeon HD 5700 Series"
For now,download them bellow right here :
Vista/Win7 x32/x64 : (381,93 mo)
http://www2.ati.com/drivers/embedded/9. ... Direct.zip
Win8 x32/x64 : (375,02 mo)
http://www2.ati.com/drivers/embedded/9. ... Direct.zip
Linux : (109,49 mo)
AMD Catalyst 12.12 Proprietary Linux x86 and x86_64 Display Driver
Description:
Automated installer and Display Drivers for X.Org 6.7, 6.8, 6.9, 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, or 7.6
http://www2.ati.com/drivers/embedded/9. ... Direct.zip