On Mon, 29 Aug 2016, Andrea Arcangeli <aarcange@xxxxxxxxxx> wrote: > On Mon, Aug 29, 2016 at 10:24:38AM +0300, Jani Nikula wrote: >> If it's an Iybridge, there's no low vswing, and that explanation is >> false. You can verify by trying i915.edp_vswing=1 or i915.edp_vswing=2 >> on an unpatched kernel. > > What I should look for when trying those two settings? Will they > successfully fix my problem with intel_backlight with upstream 4.8-rc? > > I thought it had to be the same issue as on skylake as I get the > backlight flikering at low frequency but getting brighter and darker > in a cycle lasting a few seconds and I thought there couldn't be too > many other random bugs that ends up with the same side effect. Your Ivybridge does not have low voltage swing *and* low voltage swing has nothing to do with the backlight. The regressing commit may be the same for you, but the failure mode appears to be completely different. BR, Jani. -- Jani Nikula, Intel Open Source Technology Center _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
