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Broadwell graphics hangs are common on hacks with 10.10. Try 10.11.
I see that only developer preview version is out. So I'll wait for the public release, except if you think that dev preview is stable enough.
What about the power management (with lock hold duration) messages, arent they related?
Any update on the T450s with El Capitan?
I did manage to run El Captain on T450s. Yosemite had really awfull gliches, but El Captain is really usable to debug and work more on it.
The biggest issue is still HD5500, which is detected with 7MB and 30inch monitor I tried various igplatforms and kext injection still failure :/
What's more Macosx sees only 4Gb, probably it's because 4Gb are soldered and 4Gb are inserted.
Hello @RehabMan. I am planning to install hackintosh on my t450s. However I am unsure which version of mac os will work. You've mentioned that Yosemite 10.10 causes broadwell HD graphics hang so I plan on installing 10.11. However El Captain is now available. Do you think I should give that a shot? Also I read from this that my broadwell graphics which currently has 128mb dedicated memory might cause a kernel panic. Is it true? Will it not be the case if I install El Captain? Hoping to hear from your expertise. Thanks