Comment 12 for bug 1533675

the pixelated/garbled text in Java applications (particularly severe on remote java applications) appears to be caused by bugs in the xorg intel driver for the default SNA acceleration method, see

https://www.mathworks.com/matlabcentral/answers/271637-matlab-starts-but-looks-weird-arch-linux
https://wiki.archlinux.org/index.php/intel_graphics#SNA_issues

the workaround is to create a file /usr/share/X11/xorg.conf.d/20-intel.conf with the content of

Section "Device"
Identifier "card0"
Driver "intel"
Option "AccelMethod" "uxa"
EndSection

and restart the X window, this will completely solve the pixlated graphics issue.

However, the UXA rendering method is somehow extremely unstable for my 14.04 LTS with the 4.4.0-78 kernel, only in a few minutes after X window starts, the xorg process starts to use 80-90% of the CPU load, and window response becomes sluggish, despite similar glxgears FPS readings compared to SNA. I switched several times back and forth, the observation is consistent on my computer. I had to revert back to SNA to use the computer normally. too bad this is not a real fix.