How to set DPI on imx8mq board

[coindu]

Hi：

         I want to know to how set DPI in linux 4.9.88_2.0.0 system. 

         a 10-inch screen to display weston desktop with lvds signal .Through a mipi to lvds IC.

         when run the qt5`s example I found the font size is very small .  I search the environment ，but not find the similar value such as export QWS_DISPLAY . Can anyone tell me how to set it.

[Bio_TICFSL]

Hello coin,

export QT_EGLFS_NO_FB_MULTI_BUFFER=1
if it is Unable to query physical screen size, defaulting to 100 dpi.
To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters)

Regards.