https://bugs.freedesktop.org/show_bug.cgi?id=78009
--- Comment #5 from Benjamin Bellec b.bellec@gmail.com --- I don't think this is a Mesa bug. I already noted this problem with ETQW back to July 2012 (maybe even earlier) and found a workaround. You can convert the picture to PNG thanks to ImageMagick, just run : $ convert -alpha off shot00016.tga shot00016.png
With my RV770, I just tested mesa-10.3-rc2, mesa-9.2.5 and mesa-9.1.7. All of them gives bad TGA screenshots.