Hi Simon, On 2/28/23 12:36, Simon Ser wrote: > Hi Noralf, > > Would it be possible to set the PATH connector property based on the > USB port used by gud? > > This would give user-space a persistent identifier for the connector: > if the user plugs in a USB display on a given port, the PATH would be > the same even if the machine rebooted or the displays were plugged in > in a different order. > > DP-MST already sets this. User-space can use this property to store > output configuration metadata. > drm_mode_connector_set_path_property() docs: This creates a property to expose to userspace to specify a connector path. This is mainly used for DisplayPort MST where connectors have a topology and we want to allow userspace to give them more meaningful names. Here it says that it's about giving meaningful names to connectors, I think it would be useful to know that a HDMI-A connector is on a USB adapter for instance and not on the laptop/motherboard. You mention output configuration however, why does userspace use the path to a connector when storing the multi display config and not some unique property on the displays themselves like the serial number? Noralf.
