Hi, Egbert> The scrnIndex marks the ScrnInfoRec to use and this is set up by the driver. The ScrnInfoRec Egbert> contains all non driver-private DDX data for a particular screen. OK... Egbert> Well, you will have to pass a scrnIndex to some funcitions. Which functions except xf86DoEDID_DDC2(), a driver I2C initialization function setting related members? -- Bora SAHIN