I uninstalled gfxcardstatus. Now the only times it shuts down instantly are when I initially log in (tried on user with Filevault and one without), and when I log out from one user and log into another. I've unplugged while logged in, I've put it to sleep and come back, I've logged out and back in (as same user), and it stays on. It always shuts down if I log in from a fresh reboot.
The computer works fine when plugged in. No issues. The problem comes up when it's unplugged. This started just after I updated to 10.10.4, although I don't know whether it's related.
- Start computer with or without battery, get to login screen.
- Can maintain this state for minutes at a time plugged in or on battery on login screen.
- When I log in, the computer's immediate action is to shut down. Screen just goes dark -- no warnings, no nothing.
Any ideas? SMC reset did not help. Magsafe light looks yellow or green as is appropriate to charging situation. No other weird behaviors or warning signs.
System information -> power shows nothing weird:
Charge Information: Charge Remaining (mAh): 5955 Fully Charged: No Charging: Yes Full Charge Capacity (mAh): 6547 Health Information: Cycle Count: 143 Condition: Normal Battery Installed: Yes Amperage (mA): 1337 Voltage (mV): 12468
I get no notification of any kind after it starts again as is described by this question.