INTL 3:770/1 3:770/3   
   REPLYADDR joerg.walther@magenta.de   
   REPLYTO 3:770/3.0 UUCP   
   MSGID:  9285700e   
   REPLY:  0f79b908   
   PID: SoupGate-Win32 v1.05   
   R.Wieser wrote:   
      
   >Although you did not mention it, I take it you picked up on that just   
   >disabeling HDMI output doesn't cause my TV to switch back to its previous   
   >input.  Which means that that vcgencmd doesn't seem to be the sought-for   
   >solution (and nullifies the need to test it).   
      
   I just asked ChatGPT if it knew an answer, and it did (not that I am   
   certain if it works):   
      
   Yes, it is possible for a Raspberry Pi to send a signal to a TV to   
   switch the HDMI input before shutting down. This can be done using CEC   
   (Consumer Electronics Control), a feature available through HDMI that   
   allows devices to communicate with each other and exchange basic control   
   commands.   
      
   Here’s how you can do it:   
      
   Check if the TV supports CEC: Not all TVs support CEC, and it may be   
   branded under different names like "Anynet+" (Samsung), "BRAVIA Sync"   
   (Sony), "Simplink" (LG), etc.   
      
   Install CEC tools: On the Raspberry Pi, you can install the cec-utils   
   package, which includes a tool called cec-client. This tool allows you   
   to send CEC commands.   
      
   bash   
   Code kopieren   
   sudo apt-get update   
   sudo apt-get install cec-utils   
   Send CEC commands: You can use cec-client to send various commands to   
   the TV. For example, to instruct the TV to switch to a different HDMI   
   input, you can use specific CEC commands.   
      
   Create a script: You can create a simple script that sends the CEC   
   command when the Raspberry Pi is about to shut down. For example:   
      
   bash   
   Code kopieren   
   #!/bin/bash   
   echo "as" | cec-client -s   
   The command echo "as" | cec-client -s tells the CEC client to switch the   
   active HDMI source.   
      
   Execute the script on shutdown: To automatically run the script when the   
   Raspberry Pi shuts down, you can add it to the /etc/rc.local file or   
   create a Systemd service.   
      
   Keep in mind that the exact commands and setup may vary depending on   
   your TV model and the supported CEC functions. It's a good idea to refer   
   to your TV's manual for specific information about its CEC support.   
      
   -jw-   
   --   
   And now for something completely different...   
      
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