I’ve just tried installing both 4.1.1 and 4.2.0-rc1 to a 7940HS device. No dice. The GRUB menu loads up off the the USB just fine but none of the options work.
Once a GRUB option is selected the computer reboots itself twice and back to the GRUB menu. Selecting the “Troubleshooting - verbose boot and install” option leads to 2 seconds of log entries, then the same reboot back to GRUB.
I’ve tried putting in both x2apic=false and x2apic_phys=true in the GRUB boot parameters without success.
EDIT: If anyone without 7940HS/Phoenix APU hardware needs someone who does to help troubleshoot ideas into a working Qubes install, just get in touch. Happy to test and give things a try as compatibility (hopefully) emerges over time.