On Fri, Mar 15, 2013 at 12:29 AM, Jani Nikula <jani.nikula at linux.intel.com> wrote: > I've never used the acpi_osi= kernel parameter, but it looks like you > could workaround this with acpi_osi="!Windows 2012". Please check that > running the "bad" kernel. That did not work for me. Still have black screen on the tip of git. I did that to the gurb2-efi.cfg Here is my kernel cmdline: $ cat /proc/cmdline BOOT_IMAGE=/vmlinuz-3.9.0-rc2+ root=UUID=75d90f06-bcdc-40c0-a3a3-7edf9af38d41 ro rd.md=0 rd.lvm=0 rd.dm=0 rd.luks=0 vconsole.keymap=us LANG=en_US.UTF-8 drm.debug=0xe "acpi_osi=!Windows\x202012" Chris
