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Author Topic: Apple's High Sierra Driver Bake-Off  (Read 853 times)
Rominator
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« on: June 09, 2017, 06:13:14 AM »

So, Apple threw us some curve balls in High Sierra

I dug out my RX460 and RX480 and discovered that my bar sink has a leak. The 480 had been marinating in some stinky water for 5 months.

Amazingly it still works.

Tossed them both in a 5,1 (a real one) and was surprised to discover that the 460 worked great in Sierra and the 480 worked great in High Sierra (dumb name, up there with Nvidia calling 2nd Titan Pascal the "Xp")

But 460 not liking HS and 480 not liking S (neither is patched)

Preliminary tests, I didn't try any tricks or patching. Just chucked them in there with an EFI GT630 for disk selection.

Guess I'll try some eGPU fun on a 6,1 next.
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nekton1
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« Reply #1 on: July 16, 2017, 11:56:49 PM »

Same here in 3,1 hacked to run Sierra and High Sierra.  RX460 works fine in Sierra but not with High Sierra (up to beta 3) and not even with a helper card (ancient HD2500 XT).
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Fl0r!an
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« Reply #2 on: July 17, 2017, 10:15:39 AM »

Vega support seems to be there, too. Have seen a positive report @tmx86 with Frontier Edition. Might even work when flashed with Mac EFI, since the old "crash when the card has been init'ed before OS"-bug seems to be solved on Vega.
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nekton1
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« Reply #3 on: July 19, 2017, 09:09:19 AM »

What could be stopping the RX460 in HS but not in S?
The AMD9510Controller.kext has the correct 460 ID in the right location as does the AMDRadeonX4100.kext.
I'd have expected 460 support to be native in HS as in Sierra because the late 2016 and 2017 15-inch MBPs use 460 discrete GPUs as an option.
Any ideas where to look next?
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nekton1
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« Reply #4 on: July 19, 2017, 08:33:32 PM »

HS 10.13 beta 3 installs successfully on late 2016 MBP with Pro 460 option so the 460 drivers in the OS are correct for that model. It must be a specific problem for RX460 boards and cMP but I can't spot the cause. Grabbing at straws but could it be the Acre framebuffer?
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