I had the same issue and realized I was on the vesa driver. Now I've changed to radeon and instead of the same lines you are seeing I now see a sequence of white blocks at the top of the dash itself.
If this is a driver issue, it appears to be something that unity is doing when drawing various sections of the dash and launcher that affects different parts of multiple drivers.
I had the same issue and realized I was on the vesa driver. Now I've changed to radeon and instead of the same lines you are seeing I now see a sequence of white blocks at the top of the dash itself.
If this is a driver issue, it appears to be something that unity is doing when drawing various sections of the dash and launcher that affects different parts of multiple drivers.