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?
lspci says:
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation
Core Processor Family Integrated Graphics Controller (rev 09)
Thanks,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
On Mon, 30 Sep 2019, Pavel Machek <[email protected]> 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
BR,
Jani.
--
Jani Nikula, Intel Open Source Graphics Center
On Tue 2019-10-01 12:39:34, Jani Nikula wrote:
> On Mon, 30 Sep 2019, Pavel Machek <[email protected]> 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 ([email protected])
Copyright 2004-2006 Nicolas Boichat ([email protected])
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