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Dell 5548 Some Problem


lifeisblood

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Try this DSDT.

I see you rename AppleHDA_ALC255 to AppleHDA. Hope you didn't install this to /S/L/E and override the vanilla kext.

If you did, you'll need to restore it and rename the kext in LE to something else or back to AppleHDA_ALC255 and install to /Library/Extensions.

Then run the permission fix and rebuild cache.

DSDT.aml.zip

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No, Yosemite won't work well with your Broadwell CPU. 

Restore the vanilla AppleHDA to /S/L/E

Grab the new AppleHDA_ALC255 from the Update section.

Place it in /L/E. Click Ok on the popup error.

Run this in terminal to fix permission and update cache

      sudo chmod -Rf 755 /L*/E*

      sudo chown -Rf 0:0 /L*/E*
      sudo touch -f /L*/E*
      sudo kextcache -Boot -U /
Make sure you have a successful output. If not, then run last 2 commands again.
Reboot
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