With the idle freeze fixed and persistent journal logging in place, I ran the previous boot error log to see what remained: Six errors, four distinct sources. Here is what each one means and what we did about them. Error 1: alsa-restore.rules — Missing Label What is it? When a sound card is detected, udev […]
IOUserClient and IOExternalMethod
While developing the OS X driver for my Agilent DSO-X 2002A oscilloscope, I ran into a topic that I found to be poorly documented. It is about interaction with a device driver. There are several ways to communicate with a device driver from client space (the application). One is by modifying driver properties. This method requires […]