https://bugs.freedesktop.org/show_bug.cgi?id=78287
--- Comment #3 from Mantas Mikulėnas grawity@gmail.com --- (In reply to comment #1)
The error means there is not enough video memory.
Does it always? I know -12 is ENOMEM, but I'm frequently getting the same error even though `radeontop` shows only about 200-250 MB out of 1 GB used.