Comment 41 for bug 305979

As it's not completely clear in the upstream bug reports, the kernel branch where the fixes are located is:
git://git.kernel.org/pub/scm/linux/kernel/git/anholt/drm-intel.git drm-intel-2.6.28

You can see them on: http://git.kernel.org/?p=linux/kernel/git/anholt/drm-intel.git;a=shortlog;h=drm-intel-2.6.28

commit e1a6fcee467556a7e955fe1f7ccc134dd2f974e7
Author: Jesse Barnes <email address hidden>
Date: Tue Jan 6 10:21:24 2009 -0800

    drm/i915: set vblank enabled flag correctly across IRQ install/uninstall

commit 9f4f07ceb1716d8796089fcef91621c5f07c872a
Author: Jesse Barnes <email address hidden>
Date: Thu Jan 8 10:42:15 2009 -0800

    drm/i915: don't enable vblanks on disabled pipes