Thanks, Samotnik. Upon running
/$ glxinfo | grep renderer
OpenGL renderer string: Mesa DRI R200 20060602 AGP 4x x86/MMX/SSE2 TCL
After a bit of googling*, it seems to me that hardware acceleration is enabled, but due to the jittering and slow speed I mentioned earlier, I suppose it's just not working in Firefox plug-ins.
*if you're a n00b like me and curious what all that output line means, here is the result of my googling:
is an implementation of the OpenGL
, "The Direct Rendering Infrastructure... is a framework for allowing direct access to graphics hardware under the X Window System in a safe and efficient manner."
R200 is a reference to the type of graphics card in many (most?) Dell D600s. By running /$ lspci, I see that it is a Radeon RV250 (and thus of the R200 family)
20060602 I imagine is the date of the renderer software.
"AGP 4x" is for Accelerated Graphics Port, a standard hardware interface for graphics cards, and the speed, 4x
And then I stopped googling, content that hardware acceleration was enabled.