Having the same issue with HD Graphics 515 (Asus Chromebook C302ca). Switching to uxa as noted above gets rid of the artifacting / font distortion, though note that you'll need to add quotes around both "AccelMethod" and "uxa" or X won't start.
Alternatively, you can use Wayland and the artifacts don't appear.
Unfortunately even with this change it seems to interfere with video acceleration- both Steam streaming and Shadow streaming fail to start.
Having the same issue with HD Graphics 515 (Asus Chromebook C302ca). Switching to uxa as noted above gets rid of the artifacting / font distortion, though note that you'll need to add quotes around both "AccelMethod" and "uxa" or X won't start.
Alternatively, you can use Wayland and the artifacts don't appear.
Unfortunately even with this change it seems to interfere with video acceleration- both Steam streaming and Shadow streaming fail to start.