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I'm using vc_dispmanx as a display engine and noticed the presence of vc_vchi_dispmanx library who looks quite close to vc_dispmanx.

Dispmanx seems to be a broadcom proprietary alternative to openGL, SDL, OpenMax, and so on ... It's a C library used in program such as raspivid/raspistill or pngview.

What is the difference / When should we use vc_vchi_dispmanx ?

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    What operating do you use? What is vc_dispmanx and vc_vchi_dispmanx? On my default Raspbian installation I cannot find any `*dispmanx* on the system and in the default repository. – Ingo May 18 '19 at 8:51
  • Dispmanx seems to be a broadcom proprietary alternative to openGL, SDL, OpenMax, and so on ... It's a C library used in program such as raspivid/raspistill or pngview. – Technico.top May 18 '19 at 17:39
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    @Ingo If you look in /opt/vc/include you'll find reference to this stuff. @T.t You might have a look at some of this: elinux.org/Raspberry_Pi_VideoCore_APIs At a glance dispmanx is a (being depreciated) windowing system, vhci is I think a broader umbrella interface to the GPU. I.e., one is not equivalent to the other; OGL, SDL, and openMax do not serve equivalent purposes either, although there may be some overlapping ones between them. – goldilocks♦ May 18 '19 at 18:50
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I found more information at balena.

VCHIQ means Video Core Host Interface Queue and allows to communicate with the GPU through a kernel module/driver.

https://www.balena.io/blog/raspberry-pi-gpu-for-containers/

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  • Seems your keyboard is broken. You should invest in a new one. Was you able to solve the problem? – Ingo Jun 7 '19 at 9:51

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