I have found the solution !

Edit sys.txt and you must change in section RAWDISPLAY with this :


ldpi ---- 120 dpi
mdpi --- 160 dpi
hdpi --- 240 dpi
xhdpi --- 320 dpi
xxhdpi --- 480 dpi

Exemple for Samsung GT-I9305


[rawdisplay]
driver="gles_2_0_android"
screen_xy="auto"
dpi=320