By the way, I have an nvidia card, using the nouveau drivers. SDL2 seems
to have problems with these drivers: I've seen similar behavior in other
graphical SDL2 programs.
Here's some lspci -v output for the card:
05:00.0 VGA compatible controller: NVIDIA Corporation MCP89 [GeForce
320M] (rev a2) (prog-if 00 [VGA controller])
Subsystem: Apple Inc. MCP89 [GeForce 320M]
Flags: bus master, fast devsel, latency 0, IRQ 25
Memory at d2000000 (32-bit, non-prefetchable) [size=16M]
Memory at c0000000 (64-bit, prefetchable) [size=256M]
Memory at d0000000 (64-bit, prefetchable) [size=32M]
I/O ports at 1000 [size=128]
Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: nouveau
Kernel modules: nouveau
