Programmable I/O Control Device Driver
I visited Stelian Pop’s page. From there, I downloaded spicctrl-1.9.tar.bz2. This seemed to allow me to monitor battery and power status, but not the display brightness. I then downloaded and installed the stand-alone version of sony_acpi, which I read was useful for his Sony. I could not get that to control the display brightness either. I may be up a creek on this for now.