opengl and drm on a pi 3b?

Gene Heskett gheskett at
Thu Mar 16 02:06:15 UTC 2017

Hello all, been a while since I rang your doorbell, greetings from West 

I am in the process of converting an old lathe to cnc, and using a pi 3b 
as the driver.

Doing some work on the configuration today, I got curious to see if the 
features I was adding to the configuration were pushing the poor pi to 
the point of exhaustion. Firing up htop, the various bits and pieces 
that together make up linuxcnc, were a total of about 4 or 5% of the cpu 
load.  Compton, the x compositor, was burning something in the region of 
165%, or a little over 1.5 of its 4 cores. It was also a few megabytes 
into swap, so I rebooted it, after which compton was only using perhaps 
35% of one core.

But my main reason for posting is to see if any progress is being made on 
opengl and drm drivers for that bcm video the pi has.  The display is 
just slow enough to be noticeable.  The machine its driving can move at 
up to about 100 inches a minute, with bone breaking force, so it would 
be a definite safety advantage if the video could keep up with the 
machine in something resembling real time.

So what, if any, is the status of faster video drivers for the pi's that 
use the bcm video?

Thanks all.

Cheers, Gene Heskett
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <>

More information about the xorg mailing list