I am trying to solve a tearing issue that I am see when using directfb I am running a qt 5.2 example application on DirectFb 1.7.6 on an embedded platforms with a 3.10 linux kernel. The resolution is 800 by 480 and the frame buffer drivers provides a double buffer of 800 by 960. There is no video memory and the driver allocates the frame buffer in system memory
When I used the command line parameter --dfb:desktop-buffer-mode=backvideo directfb recognizes the double buffer: (*) FBDev/Mode: Switched to 800x480 (virtual 800x960) at 32 bit (RGB32), pitch 3200 However when I use --dfb:desktop-buffer-mode=backsystem I get : (*) FBDev/Mode: Switched to 800x480 (virtual 800x480) at 32 bit (RGB32), pitch 3200 Can someone please explain this discrepancy? Why can't I use the double buffer when specifying back system? Additionally when I specify backvideo the frame drops drastically and I still see the tearing. Any insight is appreciated. I have the read archived post on the difference between backvideo and back system over here http://mail.directfb.org/pipermail/directfb-users/2009-September/001886.html Regards, Arun Ramamurthy
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