On Thursday, August 3rd, 2023 at 17:36, Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> wrote: > On Thu, 3 Aug 2023 at 18:31, Simon Ser contact@xxxxxxxxxxx wrote: > > > On Thursday, August 3rd, 2023 at 17:22, Simon Ser contact@xxxxxxxxxxx wrote: > > > > > The KMS docs describe "subconnector" to be defined as "downstream port" for DP. > > > Can USB-C (or USB) be seen as a DP downstream port? > > > > To expand on this a bit: I'm wondering if we're mixing apples and > > oranges here. The current values of "subconnector" typically describe > > the lower-level protocol tunneled inside DP. For instance, VGA can be > > tunneled inside the DP cable when using DP → VGA adapter. > > My opinion hasn't changed: I think this should be the USB connector > with proper DP / DVI / HDMI / etc. subconnector type (or lack of it). > In the end, the physical connector on the side of laptop is USB-C. - Even if the connector is USB-C, the protocol used for display is still DP. There's also the case of Thunderbolt. - This is inconsistent with existing drivers. i915 and amdgpu expose DP ports for their USB-C ports. Changing that isn't possible without causing user-space regressions (compositor config files use the connector type).
