After a messy Linux upgrade of my dual boot Lenovo T420 I ended up with GRUB replacing my MBR. Everything works fine: I can boot both Linux and Windows; the only thing different from before is that pressing the blue "Thinkvantage" button at boot time no longer starts recovery mode but just pops up a BIOS settings menu.
As far as I can tell my partitions are laid out like this
(primary) SYSTEM_DRV (?) (primary) Windows7_OS (logical?) Partitions I created (data partitions) (linux partitions) (primary) Lenovo_recovery
My guess is that previously my system booted off the SYSTEM_DRV partition which just started the Windows7 partition if no key was pressed or the Lenovo_Recovery partition if the "Thinkvantage" button was pressed.
Any idea how I can revert to that configuration?