Lion graphics extremely slow with Radeon HD 2600 Pro 256MB

I have changed the drivers on my iMac to the Snow Leopard version via the .kext. Still working fine.

My system info: (same system as David Carlin!)

Hope Apple can locate the problem.

ATI Radeon HD 2600 Pro:

Chipsetmodel: ATI Radeon HD 2600 Pro

Type: GPU

Bus: PCIe

Breedte PCIe-baan: x16

VRAM (totaal): 256 MB

Fabrikant: ATI (0x1002)

Apparaatcode: 0x9583

Revisiecode: 0x0000

ROM-revisie: 113-B2250L-259

Versie EFI-besturingsbestand: 01.00.259

I had one of the first aluminum iMacs - the Mid-2007 model. I got it right after they came out. Initially, some people (including myself) were reporting issues with the graphics cards - eventually iMac Graphics Firmware Update 1.0 came out.

It turned out what determined if you had problems or not was the manufacturer of the RAM on the video card itself. People used "ioreg -l | grep ATY" (in Terminal.app) to get the specific details of their video cards and it was eventually determined that cards with "ATY,MemRevisionID" = <0900> were OK, but folks with "ATY,MemRevisionID" = <0600> had problems. Firmware update only applied to machines with "ATY,MemRevisionID" = <0600>.

So perhaps there is a common thread for those of us having issues.

hey i used the following files for my early 2008 intel imac with ATI RADEON HD 2400 XT

i installed the files you said and after it had finished it said to reboot so i went to restart and rext helper wouldnt close so i had to force quit it to get my computer to restart and now i cant reboot into regular lion im stuck in safe mode :/ should i have not force quit the program and i tried restoring the kext from the backup folder and that hasnt worked either :/

please helpppp

Sorry to hear that.

Do you have a time machine backup?

You can start you iMac with command-r, reinstall lion and restore from time machine.

Or

With disk util you can restore permissions etc. and give that a try.

(make backups)

I'm not having the problems after waking from sleep (iMac 8,1 Core 2 Duo 3.06 4GB RAM radeon 2600 pro 256MB OSX 10.7.2) but I've noticed that flash videos (youtube, BBC iplayer) weren't running well - sound was lagging behind videos. Checked the settings and hardware acceleration was disabled and I can't re-enable it (tabbing to the checkbox and hitting space) - would these SL kexts fix this do you think?

Cheers 🙂

Chipset Model: ATI Radeon HD 2400

Type: GPU

Bus: PCIe

PCIe Lane Width: x16

VRAM (Total): 128 MB

Vendor: ATI (0x1002)

Device ID: 0x94c8

Revision ID: 0x0000

ROM Revision: 113-B2250H-259

EFI Driver Version: 01.00.259

i have no time machine backup, theres no way i can restore my old lion kexts? im in safe mode now and i can
access my files but can i backup my computer if i went and bought a hard drive???

@alexfrombristol

I have disabled flash hardware acceleration (without the sl hd2600 kext installed) and flash was running better!

Now with the SL .kext installed i cannot enable (TAB-Space) the hardware acceleration. So this hack will probebly not solve that problem.

Can't you activate it through the online flash settings manager?

@Shinru

Most of the time I am working with a windows pc so i cannot test it myself at this time.

From what i know about is that in safe mode you can access usb drives and make a backup on it.

Can't you test it with a usb flash stick?

For the future: buy a 2,5" 1GB usb drive. Make 2 partitions 1 for time machine 1 for data and activate time machine.

How did you disable hardware acceleration?

@tmma.a

Go to youtube en view a clip and pause it. Rightclick on the movie and go to settings.

Probably you cannot use your mouse to select Hardware acceleration so use the TAB key and the space-bar to disable is. (As mentioned before, probably you cannot enable it this way).

Thank you!

On my machine, videos were terrible without the hardware acceleration...odd.

Anyway, I took the plunge and went with the SL kexts, and when viewing full screen, I can bring up the flash settings, tab to and tick the checkbox, so I'm happy 🙂

Cheers to everyone who put helpful stuff up on the whole thread.

You are right. In full screen mode i can also switch Flash Hardware Acceleration on and off.

hey i have a couple of 2gb USB flash drives here tried them but they dont show up in "Finder"

but i can see them in "Disk Utility" but from there i dont think i can really do anything with them :/?
might go purchase a 1tb hardrive today but if i do how can i back up do i choose use time machine? ive never backed up anything before haha.

Sorry i do not know the sollution fot your problem.

But if nothing works: there is a FireWire target disk mode. Connect 2 imacs and start up the target computer holding down the t key.