On Tue 2019-10-01 12:39:34, Jani Nikula wrote: > On Mon, 30 Sep 2019, Pavel Machek <pavel@xxxxxx> wrote: > > Hi! > > > > Thinkpad X220 should be new enough machine to talk DDC to the > > monitors, right? And my monitor has DDC enable/disable in the menu, so > > it should support it, too... > > > > But I don't have /dev/i2c* and did not figure out how to talk to the > > monitor. Is the support there in the kernel? What do I need to enable > > it? > > # modprobe i2c-dev Thanks! I enabled I2C_CHARDEV, and installed ddccontrol: c ddccontrol - program to control monitor I can read parameters of Dell monitor on VGA: sudo ddccontrol dev:/dev/i2c-1 -c -d /usr/share/ddccontrol-db/monitor/DELA013.xml Control 0x10: +/79/100 [???] -- brightness Control 0x12: +/63/100 [???] -- contrast Unfortunately the Fujitsu monitor does not seem to communicate. Fujitsu is my main monitor :-(. pavel@duo:~$ sudo ddccontrol dev:/dev/i2c-4 -c -d ddccontrol version 0.4.2 Copyright 2004-2005 Oleg I. Vdovikin (oleg@xxxxxxxxx) Copyright 2004-2006 Nicolas Boichat (nicolas@xxxxxxxxxx) This program comes with ABSOLUTELY NO WARRANTY. You may redistribute copies of this program under the terms of the GNU General Public License. Reading EDID and initializing DDC/CI at bus dev:/dev/i2c-4... ioctl(): No such device or address ioctl returned -1 ioctl(): No such device or address ioctl returned -1 ioctl(): No such device or address ioctl returned -1 I/O warning : failed to load external entity "/usr/share/ddccontrol-db/monitor/FUS080A.xml" Document not parsed successfully. ioctl(): No such device or address ioctl returned -1 DDC/CI at dev:/dev/i2c-4 is unusable (-1). If your graphics card need it, please check all the required kernel modules are loaded (i2c-dev, and your framebuffer driver). Any further hints? Thanks and best regards, Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
Attachment:
signature.asc
Description: Digital signature
_______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
