HDMI and LVDS does not clone opengl content

[Philipp Zabel]

Hi Dexter,

On Fri, 2017-12-01 at 09:05 -0600, Dexter Travis wrote:
> I am running kernel 4.14 and mesa 17.2 with etnaviv on a imx6 dual plus. I
> do not have X11 my application is Qt5.9 with eglfs.
>
> Currently applications that write to the framebuffer show on both screens.
> psplash and fb-test both display on both screens at the same time.
> 
> OpenGL apps such as kmscube only output to the HDMI screen.  The old
> framebuffer content is left on the lvds screen.
> 
> Please help me get opengl content cloned at the same time to both screens.

For Qt5.9 with EGLFS, check out the Qt documentation:

http://doc-snapshots.qt.io/qt5-5.9/embedded-linux.html#display-output

regards
Philipp