On certain Arrandale/Ironlake GPUs the internal eDP panel is being setup incorrectly.
Upstream bug: https://bugs.freedesktop.org/show_bug.cgi?id=28070
This affects at least the HP Elitebook 2470p.
Fix is being discussed on intel-gfx mailing list.
the main effect of this bug is a blank screen on startup which is quite difficult to install on.
patch posted along with fix for bug 609763.
Queued for 2.6.32-49
Patch(es) available on kernel-2.6.32-52.el6
Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.