Hello, With Pavel, we discovered a strange behavior of the primitive #primitiveScreenDepth on Linux. It returns a value of 24 bits per pixel (True colors) that looks valid but not supported (at least by Pharo). DisplayScreen actualScreenDepth "(calling the primitive screenDepth)" => 32 on OS X [OK] => 24 on Linux [KO] Also, it is not consistent with the primitive 91 DisplayScreen new supportsDisplayDepth: DisplayScreen actualScreenDepth => true on OS X => false on Linux There are some safeguard image-side but it would be great if someone could check that vm side. Christophe.