I used the second from MacRumors as it seemed easier.
This page and scroll down past the list to the blog: In particular, the use of ArchLinux bootable CD to gain access to and re-write the EFI on the drive, and semi-permanently disable the discrete graphics chip. In addition, Steve Schow writes that he has abandoned further development - because there are better solutions available. app for direct download - you do not have to compile anything.Īlso note that if your Mac does not run long enough to allow gfxcardstatus to be added, this is not really practical. There is a fork off the main build by steveschow available that seems to fix that problem for current versions of MacOS such as ElCapitan and Sierra. There is an acknowledged bug in the current version of Cody Kreiger's Open-Source gfxcardstatus, and the developer has confessed he does not have time to fix it right now. The alternative is replacing the logic board, which is not cost effective on a machine that old, unless gfx does not resolve the issue and you really want to keep this MBP. This may allow your MBP to run normally, although it will have reduced graphics performance when permforming demanding graphics tasks. It will allow your MBP to run on integrated graphics only, bypassing the discrete GPU which has the issues. I've tried booting with just modeset=1 (no radeon.modeset or modprobe.blacklist) and the result is that same screen-within-a-screen.Ĭauses the system to boot into low graphics mode.Īny insights on this? Tomodachi's answer said "I got vga switcheroo working" but I'm not able to contact him directly due to lack of reputation.Install gfxCardStatus ( ) and set it to "i" (integrated graphics only). The system also disallows me from doing either: Vgaswitcheroo appears, but I get a weird screen-within-a-screen (the Radeon driver's environment remains, and the i915 driver draws a slightly smaller second screen in the upper left hand corner almost like a windowless virtual machine) and runningĮcho OFF > /sys/kernel/debug/vgaswitcheroo/switch Seems to disable vga switcheroo, as when I search for the switch file, it tells me /sys/kernel/debug/vgaswitcheroo is not a directory. Booting with precisely the options laid out in the answer there: The problem seems to be modprobe.blacklist=i915. However, I can't seem to use vga switcheroo properly. The Radeon card is now properly initialized and lspci is showing both graphics cards, which is appropriate. I have used the instructions provided by tomodachi here to get EFI kernel stub booting working properly.
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