Hello all OS Information OS: Linux 3.1.0-rc9-1-desktop x86_64 System: openSUSE 12.1 RC 1 (x86_64) KDE: 4.7.2 (4.7.2) Hardware Information Lenovo Thinkpad L420 Model number 78544KM i5-2520M(2.50GHz) Intel HD Graphics Problem Fails to boot without boot option of either acpi=off, nosmp, or maxcpus=0 Almost immediately freezes. CapsLock does not work and only way to continue is to power off with the power button. With debug on last line of output reads: ACPI: CE: Look up EC in DSDT Fails with kernel 3.04 and 3.1 and all distro's I have tried with. Boots no problem with 32bit and with Windows 7 acpidump https://docs.google.com/open?id=0B2IDfK0E8tJkMDFlYjM4MTEtNmM1Ni00ZGFkLTg2MzQtYTM2YTIyOWYzYmVm Please let me know what other information I should provide. Thank you Regards Steve -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html