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    • [solved] initiate xrandr configurations on login screen
    Community Discussion 1010 views · 19 replies ·
    Tofloor
    poster avatar
    barthodian
    deepin
    2016-03-02 02:07
    Author
    Edited by barthodian at 2016-3-3 09:44

    Thread summary
    Find the configuration file that loads on login screen
    • /etc/rc.local
    • ~/.bashrc
    • ~/.xprofile

    My choice is 3 for order and readability.

    Setup script to detect device and change resolution
    1. #!/bin/bash
    2. #
    3. # display-find.sh - Script to find a specific connected dislay
    4. # and apply configuration settings to it.

    6. # Customize the display to find with the name and model and the
    7. # first 16 bytes of your display EDID. That's the first line of
    8. # the displays EDID you may find with the shell command: xrandr.
    9. DISPLAY_NAME="Display brand and model name"
    10. DISPLAY_EDID="00ffffffffffff004861000000000000"

    12. # Customize the action to apply to the display
    13. DISPLAY_ACTION=("setting resolution to 1080i" "--mode 1920x1080i")

    15. # Runtime: do not edit the following unless you know what you're doing. :)

    17. # Find connected display outputs
    18. OUTPUTS=($(xrandr | grep " connected" | cut -f 1 -d " "))
    19. OUTPUTS_COUNT=${#OUTPUTS[*]}

    21. # If no connected display is found exit with error
    22. if [ $OUTPUTS_COUNT -eq 0 ]; then
    23.   echo "display-find: error! no display was found, check your cables, exiting..."
    24.   exit 1 # Exit error 1: no displays found
    25. fi

    27. # Echo found connected displays
    28. echo "display-find: found $OUTPUTS_COUNT displays connected at outputs: ${OUTPUTS[*]}"

    30. # Find each connected display's EDID first 16 bytes
    31. OUTPUTS_EDID=($(xrandr --prop | grep -A 1 "EDID:" | cut -f 1 -d "-" | cut -f 2 -d ":"))

    33. # For each found EDID check if matches the display to find then
    34. # apply action and exit, else exit with error
    35. COUNTER=0
    36. for EDID in ${OUTPUTS_EDID[*]}; do
    37.   if [ $EDID == $DISPLAY_EDID ]; then
    38.     DISPLAY_OUTPUT=${OUTPUTS[COUNTER]}
    39.     echo "display-find: found match at $DISPLAY_OUTPUT: $DISPLAY_EDID"
    40.     echo "display-find: found $DISPLAY_NAME"
    41.     echo "display-find: ${DISPLAY_ACTION[0]}"
    42.     sleep 1
    43.     xrandr --output $DISPLAY_OUTPUT ${DISPLAY_ACTION[1]}
    44.     if [ $? -eq 0 ]; then
    45.       echo "display-find: done! exiting..."
    46.       exit 0 # Exit error 0: Ok
    47.     else
    48.       echo "display-find: error! applying settings failed. exiting..."
    49.       exit 2 # Exit error 2: settings failed
    50.     fi
    51.   else
    52.     ((COUNTER++))
    53.     if [ $COUNTER -eq $OUTPUTS_COUNT ]; then
    54.       echo "display-find: sorry, no match found for EDID: $DISPLAY_EDID. exiting..."
    55.       exit 3 # Exit error 3: no match found
    56.     fi
    57.   fi
    58. done
    59. exit 4 # Exit error 4: abnormal error
    Copy the Code

    I posted a code of my own but with all honesty, the code above by @jotapesse is far more superior.


    Original post:
    I'm trying to figure out where the login script file is placed so I can go ahead and add a xrandr script upon start up. Since my TV connected with HDMI does not automatically switches to the compatible resolution (The TV does not support native 1080p but does work with 1080i) I'm trying to add a startup script to solve the problem. Where do I find this?

    Thanks.


    Reply Favorite View the author
    All Replies
    dance707
    deepin
    2016-03-02 02:25
    #1
    I had experimented with a login script for my Quad Monitor Display. What work best for me was to simply place a script in the home folder.
    Reply View the author
    tristar
    deepin
    2016-03-02 02:26
    #2
    You can do it like:

    1. /etc/rc.local
    Copy the Code


    or

    1. /home/user/.bashrc
    Copy the Code

    Reply View the author
    dance707
    deepin
    2016-03-02 02:31
    #3
    Edited by dance707 at 2016-3-1 03:35
    https://bbs.deepin.org/post/30786
    I had experimented with a login script for my Quad Monitor Display. What work best for me was to sim ...

    If i remember right     ~/.xprofile  
    containing your commands

    I stop using it because my hardware needs to sync slowly and I did not know how to put a delay in the xrandr commands
    Reply View the author
    dance707
    deepin
    2016-03-02 02:56
    #4
    https://bbs.deepin.org/post/30786
    If i remember right     ~/.xprofile  
    containing your commands

    Here are the notes my notes I found on that method :


    BY SESSION WITH .XPROFILE

    Use your favorite editor to create ~/.xprofile containing something like:

    xrandr --output VGA1 --mode 1024x768 --rate 60
    Now that command will be run every time your start your Xsession. You can force it to run by logging out and logging back in or by executing ~/.xprofile from your terminal.
    Reply View the author
    barthodian
    deepin
    2016-03-02 03:06
    #5
    Edited by barthodian at 2016-3-1 19:07
    https://bbs.deepin.org/post/30786
    Here are the notes my notes I found on that method :

    Thanks for that one. I need a script that dynamically identifies the specific device and set the resolution for it. So far a little wiki at archlinux.org is providing something I can use. Gotta find a way to "grep" the EDID properly which seems to be a problem still since
    1. xrandr --prop
    Copy the Code
    doesn't display the EDID in a fetchible printout.
    Reply View the author
    barthodian
    deepin
    2016-03-02 03:23
    #6
    https://bbs.deepin.org/post/30786
    You can do it like:

    That second method probably runs after login in to the user's account, which is not intended. But I like it better since touching the files outside the home folder is something I tend to avoid unless absolutely required. I gotta go with dance707's ~/.xprofile for clear seperated scripts.
    Reply View the author
    dance707
    deepin
    2016-03-02 03:35
    #7
    https://bbs.deepin.org/post/30786
    Thanks for that one. I need a script that dynamically identifies the specific device and set the re ...

    here are some EDID commands have no idea if they can be used in a script

    http://unix.stackexchange.com/qu ... or-a-single-monitor
    Reply View the author
    barthodian
    deepin
    2016-03-02 03:58
    #8
    Edited by barthodian at 2016-3-1 20:03
    https://bbs.deepin.org/post/30786
    here are some EDID commands have no idea if they can be used in a script

    http://unix.stackexchang ...

    They're separate programs to do those things. I was trying to get as close to vanilla Deepin as possible without installing anything else so next time around after reinstallation it's only a matter of applying the script. Besides, it would be better if my end script will become "universal" for those who have the same issue.

    Thanks for trying, but that was pretty much one of the first thing I found in Google's search results. Still lookin.

    By the way, I used
    1. xrandr --prop | grep -A 16 "EDID"
    Copy the Code
    Which will print out 16 lines after the "EDID" line. Trying to work this in the bash script like so:

    1. if (xrandr --prop | grep -A 16 "EDID" == "Matching strings"); then

    3. etc, etc
    Copy the Code
    Of course this script is still not working so I'm looking for that at the moment.
    Reply View the author
    barthodian
    deepin
    2016-03-02 17:42
    #9
    Okay so I have a working script so far:

    1. #!/bin/bash

    3. out=$(xrandr --prop | grep " connected" | awk '{print $1;}')
    4. edid='        EDID:
    5.                 00ffffffffffff004861000000000000
    6.                 2b12010380502d780a0dc9a057479827
    7.                 12484c21080031404540614081c09500
    8.                 b300d1c00101011d007251d01e206e28
    9.                 550020c23100001e662156aa51001e30
    10.                 468f330020c23100001e000000fc0052
    11.                 5339350a2020202020202020000000fd
    12.                 003b3d0f460f000a2020202020200121
    13.                 02031e714b8408090510030207062001
    14.                 230907018301000065030c001000011d
    15.                 8018711c1620582c250020c23100009e
    16.                 023a801871382d40582c250020c23100
    17.                 001e8c0ad08a20e02d10103e960020c2
    18.                 310000188c0aa01451f01600267c4300
    19.                 20c2310000988c0aa01451f01600267c
    20.                 430058c22100009800000000000000ab'

    22. if [ "$(xrandr --prop | grep -A 16 'EDID')" = "$edid" ]; then
    23.         echo "Set resolution to 1080i"
    24.         xrandr --output $out --mode 1920x1080i
    25.         exit 1;
    26. else
    27.         echo "Video-out is not available."
    28. fi
    Copy the Code

    Notice that there are still quite a few things wrong with it and it only specifically addresses my device. However, by changing the string of $edid you could specify your own device. I'm still trying to polish up the script to make it work more correctly.
    Reply View the author
    dance707
    deepin
    2016-03-02 17:52
    #10
    https://bbs.deepin.org/post/30786
    Okay so I have a working script so far:

    Very interesting
    Reply View the author
    barthodian
    deepin
    2016-03-03 14:25
    #11
    https://bbs.deepin.org/post/30786
    Very interesting

    To be honest, when you mentioned you've stopped using the script, I was somewhat hoping my script would be able to help you improve on your previous problem. I'm working on a definitive version now with easy modification in case you or someone else wants to easily modify to their own use (it's too much of a hassle as of now to create a fully functioning script and there are probably good ones already out there).

    Expect update soon.
    Reply View the author
    dance707
    deepin
    2016-03-03 14:28
    #12
    https://bbs.deepin.org/post/30786
    To be honest, when you mentioned you've stopped using the script, I was somewhat hoping my script  ...

    Thanks I saw some of your links gave me some ideas. My script is very simple I just need a 5 second delay in between commands.

    xrandr --setprovideroutputsource 1 0
    xrandr --output DVI-1-2 --auto --right-of DVI-1
    xrandr --output DVI-1-3 --auto --right-of DVI-1-2
    Reply View the author
    dance707
    deepin
    2016-03-03 14:42
    #13
    https://bbs.deepin.org/post/30786
    Thanks I saw some of your links gave me some ideas. My script is very simple I just need a 5 secon ...

    there would need to be an appropriate delay to make sure the hardware was done initializing before xrandr returns, or I would have to add in a sleep statement between commands ?
    Reply View the author
    barthodian
    deepin
    2016-03-03 15:19
    #14
    Edited by barthodian at 2016-3-3 07:20
    https://bbs.deepin.org/post/30786
    there would need to be an appropriate delay to make sure the hardware was done initializing before ...

    What I am assuming is that you want the command to be executed with a delay of 5 seconds. Which I think should be easily done using a timeout function if there is any. From what I found on http://www.cyberciti.biz/faq/linux-unix-sleep-bash-scripting/ is just putting the
    1. sleep 5s
    Copy the Code
    before you execute the command. That code seems to work in my terminal and should work in your script too. Shouldn't take to long to confirm wether or not it actually works in practice, could you let me know if it is actually as simple as that?
    UPDATE:
    I dont know if I was clear enough. Just put the code in between the executed codes for example to let them wait 5 seconds for each execution.
    Reply View the author
    dance707
    deepin
    2016-03-03 15:33
    #15
    https://bbs.deepin.org/post/30786
    What I am assuming is that you want the command to be executed with a delay of 5 seconds. Which I t ...

    Yes it worked thank you very much, I was not aware of the sleep command.
    Reply View the author
    jotapesse
    deepin
    2016-03-03 15:37
    #16
    Edited by jotapesse at 2016-3-3 00:35
    https://bbs.deepin.org/post/30786
    Okay so I have a working script so far:

    Ok, I have a worked out a more friendly script for you. It works for me although I haven't fully tested it. Tell me if it works for you.
    A few notes: if your displays EDID is correctly constructed, you only require the first 16 bytes (first string line in xrandr EDID result), as per specification it includes the Manufacturer code, Product code and Serial number. It should be enough to uniquely identify displays, even if they are from the same manufaturer and same model. The remaining EDID strings address settings and other information.

    Edit: removed previous script, corrected an error. Here it is:
    http://ideone.com/GGnXo6
    Reply View the author
    barthodian
    deepin
    2016-03-03 16:52
    #17
    https://bbs.deepin.org/post/30786
    Ok, I have a worked out a more friendly script for you. It works for me although I haven't fully te ...

    There appears to be a syntax error on line 13:
    1. test.sh: 13: test.sh: Syntax error: "(" unexpected
    Copy the Code


    However, from the look of it, this is exactly what I was tryin' to create on my own. My goodness, it almost seems like you did all this in 20 minutes while I'm sitting here just figuring things out. Gawddamn. Much appreciated man! Almost too much effort there... What's your game!?


    I'm looking at the syntax error right now...
    Reply View the author
    barthodian
    deepin
    2016-03-03 17:04
    #18
    Sorry, my bad. Didn't set file permission to +x
    1. chmod +x test.sh
    Copy the Code

    did the job.

    Everything works excellent. Thank you very much
    Reply View the author
    jotapesse
    deepin
    2016-03-04 01:26
    #19
    Edited by jotapesse at 2016-3-3 20:01
    https://bbs.deepin.org/post/30786
    Sorry, my bad. Didn't set file permission to +x

    did the job.

    Glad it worked for you. Actually it took me a few hours, I haven't played with bash for a while. I like challenges. It's fun. :-)
    Reply View the author