It’s been well documented at this point that Lion deactivates the DisplayPort on unofficial 5870 and 5770 cards. (Some 5770s will not run on Lion at all, but some do, including the single slot model.)
Maybe you’ve gone ahead and installed Lion, and are living with the card minus DisplayPort functionality. Or maybe you are holding off on Lion because you depend on DisplayPort for one of your displays.
Hopefully this patch will help. What it does is slightly modify the video driver for these cards, in a way that allows DisplayPort to operate. Unfortunately, only two displays remain operational – in other words, if you have two DVI displays and one DisplayPort display, one of your DVI displays will be knocked offline when you plug in your DisplayPort display.
It’s not a perfect solution. However, this is a working solution for those with one DVI display and one DisplayPort display. (If your only display is DisplayPort, the problem is completing the Lion install itself, as the DisplayPort will be disabled during this process. If you have a back-up video card, you can use that card to install Lion and install the patch.)
Download the 5xxx DisplayPort for Lion Patch here.
Download the patch uninstaller here.
In case you installed the 10.6.8 5770/5870 patch for Lion (which enables DisplayPort but breaks Quartz Extreme, no longer recommended!), here is a patch that restores the ATI graphics drivers to their original Lion state. It’s essentially a patch uninstaller.
Note: Only install this package if you are running the Lion original release (OS X 10.7).
You can find the revert package (patch uninstaller) here.
For the most up to date info about Lion and 5770/5870 cards, see this post.
Update: There is now a patch to activate DisplayPort on Lion for 5870 and some 5770 cards. See this post.
As expected, the video drivers in the release version of OS X Lion (10.7) are extremely similar to those found in 10.6.8. That means that the same issues experienced with 10.6.8 apply to the release version of Lion.
Specifically, all unofficial 5770 and 5870 cards will have DisplayPort deactivated, and some 5770s will render the system unbootable.
There is now a (partial) solution to the DisplayPort issue!
Unfortunately, for many double-slot 5770s there is no solution to the no-boot issue.
Because of this, I would recommend NOT installing Lion if:
- you are running a 5770 double-slot version with (DisplayPort and HDMI) or
- you run a 5870 or 5770 and use the DisplayPort/MiniDisplayPort for your only display, and this is your only graphics card
Backup first: It’s always a good idea to make a backup of your boot volume (i.e. main drive, usually called “Macintosh HD”) before upgrading to a new OS. Super Duper is an excellent software package for doing this, or you can use Disk Utility to clone a non-booted volume to another disk or partition.