Am 02.12.09, 10:17 +0100 schrieb Xavier Bestel: > On Wed, 2009-12-02 at 19:07 +1000, Dave Airlie wrote: >>> how would one talk with a monitor over DDC/CI on a user side, non root >>> application. I would like to do monitor gamma curves I/O, EDID polling and >>> other non standard communication. >>> >>> The /dev/i2c-xxx device nodes are root access only on my system. I can >>> chmod them with o+rw, but thats shurely not the general solution. >>> >>> What is a good place to start with in Xorg? >>> >>> I have seen the ddc/XF64DDC.[h,c] and i2c/xf86i2c.[h,c] modules in the >>> server. Is already one of those APIs exposed? >>> >>> As I understand, the root windows or xrandr output EDID atom is a one time >>> thing and too static for my needs. >>> >> >> You'd need to add protocol for the client side apps to talk to the X server,. >> >> you could possibly do this with xrandr properties or extending xrandr, >> then drivers would have to talk to the i2c via X i2c or kernel i2c in kms >> case. > > Have a look at http://ddccontrol.sourceforge.net/ for a working > implementation that bypasses the X server (although as says Dave, going > through Xrandr looks like the right thing to do).
ddccontrol uses /dev/i2c-xxx, so the problem of non root access remains with that library. Otherwise it seems very fine. kind regards Kai-Uwe Behrmann -- developing for colour management www.behrmann.name + www.oyranos.org _______________________________________________ xorg mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/xorg
