trouble switching input source

[ratmice]

I was have two computers hooked up to one monitor (one hdmi, one dvi) which I can switch between using the physical buttons on the monitor to switch the input channel.

I didn't seem to find a way to do the same using ddcutil:

$ ddcutil capabilities Feature: 60 (Input Source) Values: 01: VGA-1 03: DVI-1 04: DVI-2 trying to setvcp 60 1 it will switch to vga and back, but switching between 3, and 4 doesn't appear to do anything (never leaves the current input source)

I ran ddcutil in the background switched input source with physical buttons $ while true; do ./ddcutil getvcp 60; sleep 1; done VCP code 0x60 (Input Source ): DVI-1 (sl=0x03) Display not found VCP code 0x60 (Input Source ): VGA-2 (sl=0x02) Display not found Display not found

VCP code 0x60 (Input Source ): DVI-1 (sl=0x03) What is mildly interesting to note is that the using the physical buttons it temporarily switched to vga-2 before switching to hdmi input source (It shows this on screen as well), but vga-2 doesn't show up in the ddcutil capabilities output above. The values there mysteriously jump from 1 to 3. Will try and get ddcutil running on the other hardware connected to the monitor and see what it does, let me know if there is anything else that would be helpful

[rockowitz]

Several comments:

1) The monitor's capabilities string should be regarded as no more than suggestive.  It is often wrong.  The "ddcutil capabilities" command reports it, but other than that ddcutil does not rely on it.

2) To see the full list of values defined in the spec, use the command:

  ddcutil vcpinfo 60 --verbose

No monitor (that I know of) implements all the values, and there are some monitors with exotic connections that implement additional values.   Note that there are separate values (x11 and x12) for HDMI connections, though it is not unheard of for monitors to report an HDMI connection as a DVI connection because of their electrical similarity.

In your case, the capabilities string is declaring that connections VGA-1, DVI-1, and DVI-2 are present.

3) To see the actual values used by VCP feature x60, issue command "ddcutil getvcp 60" from the currently connected computer.  The "Display not found" lines in your output reflect the fact that the monitor is switched away from the current computer.

4) Whether it is possible to issue setvcp commands to a monitor taking its input from a different computer seems to be monitor dependent.  Once you have figured out the actual values of feature x60 for your monitor, try issuing the setvcp command from the computer whose connection is currently active, i.e. from the computer you are trying to switch away from.

5) Please execute the following commands on each of the computers and send the output in attached files.  It's more information than needed, but avoids lots of back and forth with little questions.

 ddcutil detect --verbose  ddcutil environment --verbose

Alternatively, you can use the following convenience command, though it will take a long time to run as it performs additional checks.

 ddcutil interrogate

Sanford

On 10/19/2017 04:08 AM, ratmice wrote:

I was have two computers hooked up to one monitor (one hdmi, one dvi) which I can switch between using the physical buttons on the monitor to switch the input channel.

I didn't seem to find a way to do the same using ddcutil:

$ ddcutil capabilities Feature: 60 (Input Source) Values: 01: VGA-1 03: DVI-1 04: DVI-2 trying to setvcp 60 1 it will switch to vga and back, but switching between 3, and 4 doesn't appear to do anything (never leaves the current input source)

I ran ddcutil in the background switched input source with physical buttons $ while true; do ./ddcutil getvcp 60; sleep 1; done VCP code 0x60 (Input Source ): DVI-1 (sl=0x03) Display not found VCP code 0x60 (Input Source ): VGA-2 (sl=0x02) Display not found Display not found

VCP code 0x60 (Input Source ): DVI-1 (sl=0x03)

What is mildly interesting to note is that the using the physical buttons it temporarily switched to vga-2 before switching to hdmi input source (It shows this on screen as well), but vga-2 doesn't show up in the ddcutil capabilities output above. The values there mysteriously jump from 1 to 3.

Will try and get ddcutil running on the other hardware connected to the monitor and see what it does, let me know if there is anything else that would be helpful

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/rockowitz/ddcutil/issues/35, or mute the thread https://github.com/notifications/unsubscribe-auth/ANhsbkZ8Jq4naHUpZAYAzrV-hTTbagCTks5stwOEgaJpZM4P-2Pt.

[ratmice]

2) To see the full list of values defined in the spec, use the command:

ddcutil vcpinfo 60 --verbose

Thanks, this was helpful, the HDMI input source ended up being 0x0f: DisplayPort-1

The following worked perfectly. $ ddcutil setvcp 60 0x0f

So I suppose closing would be appropriate

[rockowitz]

Matt,

Please run command "ddcutil interrogate" and send the output as an attachment.  I'd like to add your monitor to the rogues gallery at http://www.ddcutil.com/monitor_notes/

Sanford

On 10/19/2017 10:09 AM, ratmice wrote:

 2. To see the full list of values defined in the spec, use the
    command:

ddcutil vcpinfo 60 --verbose

Thanks, this was helpful, the HDMI input source ended up being 0x0f: DisplayPort-1

The following worked perfectly. |$ ddcutil setvcp 60 0x0f|

So I suppose closing would be appropriate

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/rockowitz/ddcutil/issues/35#issuecomment-337919874, or mute the thread https://github.com/notifications/unsubscribe-auth/ANhsbm7BK0J3d2OmC_ryoJogWshslIOIks5st1gvgaJpZM4P-2Pt.