Comment 25 for bug 1216252

I'm not sure this helps, but I've been seeing what looks like exactly this bug on my Lenovo T430s as well. I first saw it when entering text: the garbled long, horizontal rectangle changed as I typed (my typing was a part of it and/or near it). Like the reporter of this bug, the rectangles often appear as if the width does not match the contents, causing offsetting/slanting of the pixel lines (perhaps just one effect).

It's just been the past few weeks or less (approx.) that I remember noticing it. I am on xf86-video-intel 2.21.13-1 (Arch Linux), and kernel 3.10.2, but I do believe I saw the issue with kernel 3.9.9 as well (and I know I saw it with xf86-video-intel 2.21.12-1, also).

It happens at seemingly random times, and often I just see a random rectangle (mostly in Chromium) with the garbled contents, but it goes away quickly when something changes. The rectangles sometimes look different than described above, but I suspect it is the same cause. I'll try to get a screen capture next time I see it.

I'll attached my Xorg.0.log file, in case that is of help.