Comment 360 for bug 541511

(In reply to comment #210)
> (In reply to comment #206)
> > (In reply to comment #205)
> > > Seems like we are back to square 1 with most recent 2.6.35 git update.
> >
> > I'm running 2.6.35-rc6 (juli 22) + v9 patch, which works for me. There have
> > been a number of Intel DRM updates since though. I'll see if I encounter the
> > same problem with latest git and then bisect.
> >
> > PS: do any of you have problems with full screen video or OpenGL apps? My
> > system crashes immediately after starten such apps (flash, doom, warzone,
> > etc.).
>
> Bisect just completed, the bad commit is:
>
> 592d32cc4156ee512e55c5bc052fdece215f52b2 Merge
> git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6
>
> It modifies (strangely) the i915 driver although it's not an USB-thing. I am
> inspecting the diff right now but it seems like a blunder.
>
> I'll post my findings upstream as soon as I have finished with it

Most of the patch has already been reverted, except the change reverted by the following small patch (which I am now testing):

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 5dde80f..8608462 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -806,7 +806,6 @@ intel_dp_dpms(struct drm_encoder *encoder, int mode)
                        intel_dp_link_train(intel_encoder, dp_priv->DP, dp_priv->link_configuration);
                        if (IS_eDP(intel_encoder)) {
                                ironlake_edp_panel_on(dev);
- ironlake_edp_backlight_on(dev);
                        }
                }
        }

This is possibly the only (related) difference.