Choppy graphics with Radeon 6970?

[Jimbolaia Jones]

Hi!

 

I got a post in Mavericks forums which mentions this problem. I gave up Yosemite and got stuck with Mavericks, so if anyone got a solution for me, Yosemite is better, and I don't mind reformatting my ext hdd so I can run the Yosemite image on it again.

 

So, I have a radeon 6970, you can see my specs in my sig. It is choppy, like really choppy, I can write in "root" and "root password" in the login screen, and it doesn't have time to react that I wrote something before it has to start with the (very laggy) spinning circle.

 

However, I can watch YouTube videos. Didn't try HD and fullscreen, but it was no lag at all in 480p windowed YouTube mode.

 

Anyone had these problems here?

[jamiethemorris]

What framebuffer are you using for you GPU? I would try a different one. Also look for messages in Console.app. Are you saying that it's fine in Mavericks but not Yosemite? Using it on an external HD is not exactly ideal either, that's bound to make it slow...

[Jimbolaia Jones]

1. I am using Gibba, as that was what I used in Lion back in 2011/12 when I started using OS X briefly. Had Minecraft installed there, so I take it it worked fine, haven't tested that version as it is installed (still got it, didn't notice the 80GB missing on my HDD for three years, WTF!), the HDD is very slow so it takes like 1 minute to boot from boot loader to login screen...

2. I can't get into Mavericks install, I get a white screen with a cursor, then it hangs. If I run it without -v, I get the Apple and the loading circle, then I have the Apple and a cursor (!), then it hangs. So basically, with -v, I am where I would be right before it gives me the install screen. Same without, as I get the cursor but the system hangs just before, and 15sec later the cursor is not movable (I actually lose power to my keyboard and mouse then, no LED on my mouse anymore, you know the bright red one under).

3. I am not running it ON the ext hdd, but the install is from, as I lack my memory stick. Works fine to install from it.

 

The OS X itself is running from my Intel SSD, so it is fast as hell, no worries there

 

I wonder if I MUST have Trim enabled for some weird reason? If that can be a trigger for it.

 

Anywho, if you got any good answers to what framebuffer I should try, seeing that I could not use Elodea, this I tried first, till I remembered Gibba worked for a Cayman XT.

 

Cheers!

http://www.insanelymac.com/forum/topic/302400-having-problems-with-white-screen-at-install-of-109-olarila-way/

Here is a link to the Mavericks thread I made first, which takes the white screen and hang at install boot issue to question. The reason I went for Mavericks was hopes that the choppy graphics weren't there, as they weren't there in Lion at all.

 

The only difference between my Lion and Yosemite installs are HDD vs SSD, and Radeon6970.pkg kexts in Lion, and stock kexts with Chameleon loading Gibba FB and GraphicsEnabler=Yes. Everything else is as it was stock in Yosemite.

[Jimbolaia Jones]

It seems I am getting the white screen hang without -x even when I run with SkipAtiGFX=1 and GraphicsEnabler=No

 

So I wonder if this is related to the kexts at all.

 

The problem is, before, I had it working, but then I somehow got the ATIxxxxx kexts, now I only got the AMDxxxx kexts. I don't know why I can't get the ATI kexts this time around... Really weird!