Contribute
Register

What is the root cause of AMD 6xxx issues (white screen)

Joined
Jun 18, 2011
Messages
101
Motherboard
Gigabyte Z370N Wifi
CPU
i5-8600K
Graphics
RX 560
Mac
MacBook Pro
Mobile Phone
Android
Hello,

anyone knowing why users with Radeon 6xxx are facing issues, specially white screens upon booting with UniBeast? This card is supposed to work natively with OSX (at least it did in Lion). I suppose it is still natively supported on ML as there are several recent Mac with this GPU.

I have seen several tips to workaround it (GraphicsEnabler = no, deleting and re-installing kext ATI6000, taking the GFX card out, etc), but I wonder what is the exact cause of the problem. Is it a faulty kext?

Tks for your answers!
 
Joined
Jun 15, 2012
Messages
49
Motherboard
Gigabyte Z68XP-UD3 (Bios u1g)
CPU
Intel Core i7 2600K
Graphics
Sapphire Radeon HD6870
Mac
MacBook Pro
Classic Mac
PowerBook
Mobile Phone
iOS
I'm curious too !!
 
Joined
Jul 27, 2012
Messages
9
Motherboard
gigabite x68x-ud3h-b3
CPU
intel i2600k
Graphics
ati 6870
Mac
Classic Mac
Mobile Phone
I'd also love to know...
 
Joined
May 31, 2012
Messages
10
Motherboard
ASUS P6X58D-E
CPU
Intel Core i7 950
Graphics
Sapphire Radeon HD 5750
Mac
Classic Mac
Mobile Phone
iOS
It's also of interest that some of the lower-end 6xxx cards are re-branded 5xxx cards. Many brands of 5xxx cards that worked fine in Lion now boot with full resolution but no QE/CI. There has to be a root cause for all of these shenanigans.
 
Joined
Jan 11, 2012
Messages
23
Motherboard
Gigabyte Z77X-UD5H
CPU
i7-3770K
Graphics
Gigabyte Radeon HD 6850 1 GB (OC)
Mac
MacBook Air
Classic Mac
Mobile Phone
iOS
AMD 6xxx FIX

Gents (and ladies, if you're out there "hackin'" it up),

I ran across this issue myself when starting a clean install of ML yesterday. I can't pin down EXACTLY where in the forum I found the idea but when I do I will give proper creds. Anyways, I have a Gigabyte Z77X-UD5H, Gigabyte Radeon HD 6850 1 GB (overclocked), and the i7-3770K. After experiencing the white screen a couple times (tried GE=No, Yes, didn't mess with .kexts), I ended up plugging my monitor (HDMI) into the motherboard and unplugging the HD 6850 power plug. After installing using motherboard (I don't think that I had to use the 'GraphicsEnabler=No' switch for the motherboard), I plugged in the HD 6850 and plugged my monitor into the graphics card (HDMI port). I then booted back into Unibeast (new ML hard drive) USING the 'GraphicsEnabler=No' switch and ran MultiBeast. The most important part of correcting the video card issue is adding ATI keys to the chameleonboot.plist (in the /Extras folder) so every subsequent boot goes off without a graphics hitch. I posted a response with the boot.plist switches at the link provided.

http://www.tonymacx86.com/graphics/57150-replace-hd4850-hd6850.html#post367881

<key>AtiConfig</key>
<string>Bulrushes</string>
<key>AtiPorts</key>
<string>4</string>
<key>Darkwake</key>
<string>0</string>
<key>GraphicsEnabler</key>
<string>Yes</string>
<key>Kernel Flags</key>
<string>arch=x86_64 npci=0x3000</string>
 
Joined
Jan 6, 2011
Messages
301
Motherboard
Asus P8P67 Pro (v3.0)
CPU
i7 2600k
Graphics
Radeon 6850
Mac
MacBook Pro, Mac mini, Mac Pro
Classic Mac
Mobile Phone
iOS
Joined
Jan 21, 2011
Messages
17
Motherboard
MT Lion 10.8.1
CPU
E7500
Graphics
GT640
Mac
Classic Mac
Mobile Phone
same issue to me.

then I change two flags in BIOS setting

Init Display First = Onboard
Onboard VGA = Always Enable


after reboot, everything works fine and no more white screen.
 
Joined
Jan 20, 2011
Messages
38
Motherboard
Gigabyte mobo
CPU
Intel cpu
Graphics
6870
Mac
MacBook Pro
Classic Mac
Mobile Phone
I think the UniBeast info for this series of adapters may be faulty. (The Kexts, I guess.) I used a workaround similar to others in that I installed an nVidia GT260 in place of the 6870 until the install completed. After installing the 6870, Mountain Lion ran just fine. I have to admit that the screen definition is sharper with the nVidia card for some reason.
 
Joined
Dec 11, 2010
Messages
169
Motherboard
Z170X Gaming 5
CPU
i7 6700k
Graphics
RX580
Mac
iMac
Mobile Phone
iOS
I'd also like to know what the root of the problem with this kext is.
I have a Powercolor 6870

However, after getting ML installed - Open CL is working again (luxMark doesn't throw up errors anymore and works).
Everything looks nice and crisp and just seems to run better.
Lion 10.7.4 was terrible.
 
Joined
Jun 26, 2012
Messages
41
Motherboard
Asus B85M-E/CSM
CPU
i7-4790K
Graphics
RX 580
Mac
iMac, MacBook, MacBook Pro, Mac mini
Mobile Phone
iOS
Likewise, I'm curious as to what the situation is. I'm ready to start a build tomorrow... I've got a Sapphire 6850 still in the box, but no integrated graphics (got an Ivy Bridge Xeon). I'm wondering if I should send it back and get a nvidia GT 640 instead to get native support....
 
Top