One of the hybrid-graphics-linux team member has posted an email to the mailing list with details about the Asus EEPC 1015PN laptop in Linux:
The Intel GMA is not activated at all under linux, and the only way to switch it on, is to reboot on Windows, and switch the optimus ON.
- ION -- PCI 0000:04:00:0
- Intel GMA -- PCI 0000:00:02:0
The modified acpi_call method for the Asus EEEPC 1215PN, doesn't work on this model to switch off the nvidia ION card.