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On my Laptop the names of my graphical outputs change depending on what chip is activated in the BIOS. This leads to problems in some scripts where outputs such as VGA-0 or LVDS-0 are specified. So I want to rename the graphical outputs, similar to how you can specify persistent names for network devices with udev.

But I can't find anything that would explain how or if this is even possible at all.

In /sys I could find kernel names such as as:

/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-DVI-D-1
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-VGA-1

while xrandr reports the names as DVI1 and VGA1. So they have to be renamed somewhere(?) When I call udevadm info on one of those devices I get a lot of information but not the names used by xrandr and other X tools.

So is it possible to create a udev rule to rename the outputs and if so how? Are the names even set by udev?

  • Wouldn't be easier to use xrandr in the first place? I mean parse it's output to get the names you need rather than hard coding them into your scripts. This sounds like an XY problem. What do your scripts do? – terdon Oct 5 '13 at 23:26
  • Maybe I should have elaborated some more (or less). The outputs are not actually specified inside a script but in a config file for my window manager (i3). There might be some other way, I'm actually pretty sure there is. But I still want to know if the outputs can be renamed or not. – ifschleife Oct 6 '13 at 17:04
  • Have you found a clean way to solve this yet? – Marcin Kaminski Mar 15 '16 at 23:36
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The name of the output is set by the graphics card driver. This is then passed through X to xrandr. I believe they base it on the kernel device name but there is no standard scheme that is used.

thinkwiki documents some of the variations.

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