Just got the OS X 10.10.4 Update. Noticed this in the release notes:
- Addresses an issue that prevented some external displays from functioning properly
Has this resolved any issues anyone has been having with the LG 31MU97?
Short answer: doesn't work AT ALL, and I got myself into trouble.
LONG answer:
I've been running in 30Hz off of the HDMI connection. Not perfect, still get the speaker pop when logging in, but no dropouts.
Thought I'd try connecting the displayport cable again to see if 10.10.4 did any better. BIG mistake. Started seeing a malformed white apple on my secondary monitor while starting up. The monitor detected some video output on startup, but then showed "no signal". After several restarts, it kept going to the recovery console, asking me if I wanted to reset my password. Yikes!
I unplugged all peripherals, same story. Reset PRAM, and the OS came on my secondary monitor! Plugged in HDMI, i was back in business.
Tried the Displayport cable again. Same issues as before. No signal on the monitor, boots to recovery console, wants me to change my password.
Tried reseting PRAM again. No luck.
After a dozen reboots and inconsistent results, I connected the HDMI cable again. Got the recovery console. Reset the PRAM, and it works! Plug in the rest of my peripherals, and it continues to work.
Not sure what happened in this last update, but I no longer have the ability to use a DisplayPort connection AT ALL, where on 10.10.3 I was able to use 60Hz, albeit with the intermittent video dropouts after waking from sleep.
Don't know if I'm more disappointed with Apple, or LG.