Graphics artifacts with recent SNA driver
Submitted by James Miller
Assigned to Chris Wilson
A recent version of the SNA driver is causing strange drawing issues on my machine. Areas of the screen will either fail to update, or switch between the correct display and an old version. In both cases, doing something to trigger a redraw in the affected tends to fix it, however it doesn't always, it seems that "smaller" changes don't necessarily fix it. For example, scrolling through logs on the terminal will cause blocks containing the timestamps to stop updating until more than a few characters change within the block.
I have the issue in the driver built from commit 26f8ab54 but not with a508b11b.
I am running ArchLinux on a Lenovo ThinkPad T540p. I have an Intel i7 Haswell chip and am using the integrated graphics card.
My Xorg configuration is just set to use SNA and has TearFree enabled. Using UXA fixes the problem, but causes tearing issues (that have always been present). I am also using Bumblebee.