Strange video driver/NVRAM problem
I've got something strange happening here with the NVRAM settings on my 1,1 (flashed to a 2,1 w/ 5355's) and an un-flashed Nvidia GT 610.
Overall everything works great, it's just this one little thing that I'm hoping somebody with a similar system could try to see if they can duplicate it for me.
There is some weirdness happening when I zap the PRAM using the "command-option-P-R" key combination.
I've tried this with both commit 2ed42fe and 3b402a9 of Pike's boot.efi, and the result are the same with both builds, I didn't have the chance to try this on any earlier builds.
I know this worked with Tiamo's boot.efi build for Mavericks.
So
I try to zap the PRAM, and after getting the second chime I release the keys and wait for the video to come back (since I don't have a boot screen).
Only problem is the video never comes back.
So I plug my old 7300GT in to see what the problem is, and it boots fine, all the way up to the login screen.
Then I can remove the 7300 and put the 610 back in, and all is well.
I've found I can zap the PRAM all day with the 7300 installed, and I always get back to the login screen, but if I have the un-flashed GT 610 installed I never get any video out until I first re-install the 7300.
Once I get to the login screen with the 7300 installed, I can shut down, re-install the GT610, and everything works great again.
It's almost like my system won't recognize the 610, until it gets one clean boot with the old 7300 installed.
I have tried using both Apple's built in Yosemite drivers, and the latest Nvidia web drivers, and the problem is still the same.
Very strange.
I don't know if anybody else here has experienced anything similar, or if someone has a similar system. maybe they could try to zap the PRAM using "command-option-P-R" and see if they can duplicate this.
Thanks.
- Jay