I ran into this when compiling from the vanilla 3.9-rc1 (and 3.8.2; 3.8.1 is fine) sources on an Xubuntu 12.10 box with kernel-package. It manifested kind of strangely on my Lenovo machine with EFI support - all I'd see at boot is 'Scanning for btrfs filesystems' and it would appear to hang - recovery mode showed the mount issue with /sys/firmware/efi/efivars that I could successfully skip and at least get to a text console.
It looks like 'CONFIG_EFI_VARS' is the culprit - I unset it and recompiled, and I can now boot successfully. For those using menuconfig, it's under 'Firmware Drivers' as 'EFI Variable Support via sysfs'. I'm not sure if this patch notice is related or the culprit: http://permalink.gmane.org/gmane.linux.kernel.efi/773 I'm not sure what the ramifications are of having this disabled on a machine that uses EFI to boot, but so far everything seems normal; let me know if you'd like more details from my particular system. Thanks! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1146868 Title: cannot mount /sys/firmware/efi/efivars on boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1146868/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
