So far, no really serious problems with Yosemite. Apple changed some iPhoto/iCloud/Photostream behavior, which interrupted my workflow a bit until I figured out that I had to turn off Photostream on my iPhone then turn it back on to sync properly.
One issue I did have is with my RT-Systems control cable for my FT-817; it stopped working.
I checked /dev, and it was no longer there. Pull up System Information and it showed it was connected, so that’s good, but its absence from /dev meant that the OS was probably not even loading its driver.
So, off to /var/log/ for a quick check of system.log and confirmed that OS X was definitely refusing to load the RT-Systems’ “FTDI” USB driver:
# sudo grep -i ftdiusb system.log system.log:Oct 17 07:01:06 blah.esthermofet.com sudo: john : TTY=ttys000 ; PWD=/dev ; USER=root ; COMMAND=/sbin/kextload /System/Library/Extensions/FTDIUSBSerialDriver.kext system.log:Oct 17 07:01:08 blah.esthermofet.com com.apple.kextd: ERROR: invalid signature for com.FTDI.driver.FTDIUSBSerialDriver, will not load
Invalid signature? A few minutes’ checking of the magical Google and it appears there’s no option to whitelist any drivers in 10.10. But we can just disable the requirement to have any drivers signed by switching Kernel Extensions to Developer mode:
# sudo nvram boot-args="kext-dev-mode=1"
Type your password when prompted by sudo then reboot your Mac. Log back in, turn on your transceiver, open FLDigi, and get back on the air.