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POadd udev rule for external display
 

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  1. POadd udev rule for external display
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    <p>I wrote a small shell script configuring attached external displays with xrandr.</p> <pre><code># cat /home/didi/bin/monitor_autoswitcher.sh #!/bin/bash xrandr | grep "HDMI1 connected" if [[ $? == 0 ]]; then # is connected xrandr --output HDMI1 --right-of LVDS1 --auto else # not connected xrandr --output HDMI1 --auto fi xrandr | grep "VGA1 connected" if [[ $? == 0 ]]; then # is connected xrandr --output VGA1 --right-of LVDS1 --auto else # not connected xrandr --output VGA1 --auto fi </code></pre> <p>That works. Now I want to have it triggered automatically and found out that this can be done with udev. I tried</p> <pre><code>udevadm monitor </code></pre> <p>which, when plugging in an external displays outputs</p> <pre><code>KERNEL[465828.240250] change /devices/pci0000:00/0000:00:02.0/drm/card0 (drm) UDEV [465828.243549] change /devices/pci0000:00/0000:00:02.0/drm/card0 (drm) </code></pre> <p>and when plugging it out</p> <pre><code>KERNEL[465836.844209] change /devices/pci0000:00/0000:00:02.0/drm/card0 (drm) UDEV [465836.847445] change /devices/pci0000:00/0000:00:02.0/drm/card0 (drm) </code></pre> <p>Also good.</p> <p>Then I added an udev rule:</p> <pre><code># cat 40-external-display.rules SUBSYSTEM=="drm", ACTION=="change", RUN+="/home/didi/bin/monitor_autoswitcher.sh" </code></pre> <p>and restarted udev</p> <pre><code>service udev restart </code></pre> <p>Unfortunately, still nothing happens when plugging in/out the display. The script <code>monitor_autoswitcher.sh</code> definitely works, because invoking it manually after plugging does what it should.</p> <p>What's missing?</p>
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