No Display Found

[aspate]

Hi All,

I am very new with Linux and RaspberryPi, but I would like to use ddcutil with it.
I tried to use ddcutil detect, and keep getting: No displays found
I am running a Raspberry Pi Zero attached to a Dell P2219H via HDMI.
The DDCI is turned on for the monitor.

I think it may be an issue with i2c, but I am not sure.

I ran the ddcutil interrogate,
ddcutil.txt

I started to spread them back out into lines, but feared messing things up for anyone who knew what words to look for.

If anyone could provide some help, I would appreciative.

Thanks!

[rockowitz]

The interrogate output shows that /dev/i2c-2 does not exist.  On the Pi 3, this is used for DDC communication with the HDMI connected monitor.  I do not have experience with the Pi Zero, but it appears similar.  For documentation on configuring the Pi (though it has not been updated in some time), see http://www.ddcutil.com/raspberry/#raspberry-pi.

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On 9/21/20 12:05 PM, aspate wrote: Hi All, I am very new with Linux and RaspberryPi, but I would like to use ddcutil with it. I tried to use ddcutil detect, and keep getting: No displays found I am running a Raspberry Pi Zero attached to a Dell P2219H via HDMI. The DDCI is turned on for the monitor. I think it may be an issue with i2c, but I am not sure. I ran the ddcutil interrogate, ddcutil.txt <https://github.com/rockowitz/ddcutil/files/5256625/ddcutil.txt> I started to spread them back out into lines, but feared messing things up for anyone who knew what words to look for. If anyone could provide some help, I would appreciative. Thanks! — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#144>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ADMGY3WTNSSYZ6MOD3RCPGDSG52VJANCNFSM4RUW22FA>.

[kode54]

I have a similar problem on Arch with an RX 480, there are no i2c devices in the system, even though I have two displays connected.

[rockowitz]

Have you run "ddcutil environment"? That likely will diagnose the problem.   If not, run "sudo ddcutil interrogate" and submit the output as an attachment.

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On 10/3/20 9:34 PM, Christopher Snowhill wrote: I have a similar problem on Arch with an RX 480, there are no i2c devices in the system, even though I have two displays connected. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#144 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ADMGY3UPWYGJFXF6JW3PTZLSI7GL5ANCNFSM4RUW22FA>.

[kode54]

Yeah, that showed me that I need to have i2c-dev loaded, and that I needed to do the i2c group permission dance. All fixed. Which has nothing to do with the original post, sorry.