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Question on i.MX 6 Graphics User’s Guide, Rev. 0, 06/2016 (delivered with Yocto): Tearing regarding frame buffers...

Question asked by Martin Maurer on Jul 18, 2016
Latest reply on Jul 19, 2016 by Bio_TICFSL

PDF-Document "i.MX 6 Graphics User’s Guide, Rev. 0, 06/2016" is in Yocto "fsl-yocto-L4.1.15_1.2.0-ga" directory "doc".

 

In chapter 4.2.2, page 31 there is the environment variable

 

FB_MULTI_BUFFER

 

with following description (only a part of it):

 

  • If set to 2 or 3, VSYNC is enabled and there are double or trible frame buffer. Because of the hardware limitation of current IPU, there may be tearing on screen.
  • If set to 4 or more, VSYNC is enabled and no screen tearing appears.

 

A question on this note: "Because of the hardware limitation of current IPU, there may be tearing on screen."

What are these limitation mentioned here? And why are the limitation away, when 4 or more frame buffers are used?

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