When the screen contents change there are short stripes in the area that changed, like when moving/resizing a window.
The stripes vanish over time, within a few seconds. Attached a short video of it.
With the current bios version it's happening only after a S3 cycle, before it was happening always.
running current nightly
just for the record, this can be seen with 3.13/3.14 too, so it's not a regression on nightly
drm/i915/bdw: Restore PPAT on thaw
auto healing ftw :D