Hi, I filed this bug report: https://bugzilla.kernel.org/show_bug.cgi?id=48211 and Alan suggested I mail this list. I cannot boot 3.6 with acpi on using this hardware: Shuttle sp35p2, Intel P35, AHCI SATA disks attached via an external SATA port multiplier I get a NULL ptr deref in ata_dev_acpi_handle with 3.6, but not with 3.5.4. Using acpi=off convinces 3.6 to boot. I'm new to kernel debugging and don't have a serial console, but I did manage to slow the printk's and take a video. See around 2:00 here: http://www.youtube.com/watch?v=WNkQCnfc56g&t=2m1s Please let me know if you require any further info to debug this. Best Regards, Dan -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html