3743747dbcf538ddd6db882bde7243656d0c5596 is first bad commit
commit 3743747dbcf538ddd6db882bde7243656d0c5596
Author: Ma Ling <ling.ma@intel.com>
Date:   Wed Jan 14 14:46:52 2009 +0800

    Disable VGA plane reliably

    This fixes #17235, VGA random hang on recent G45/43 board.
    From spec, SR01 bit 5 should be set before VGA plane disable through
    control register, otherwise we might get random crash and lockups.
    (cherry picked from commit db9f5915ce812144ffd9d2aa42e8ba856129c35e)

:040000 040000 df9f51e4ec5e95a5dd8ae060b4e40aaaa2838fb6 9d8af99164ada9194fd25504ef3087659052be36 M      src