Re: sad output names

[Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>]

On Wed, 2018-07-25 at 14:21 -0400, Felix Miata wrote:
> Rodrigo Vivi composed on 2018-07-25 09:20 (UTC-0700):
> 
> > 
> > On Wed, Jul 25, 2018 at 03:37:52AM -0400, Felix Miata wrote:
> > 
> > > 
> > > Asus B250 LGA 1151 (Kaby Lake) Motherboard (4 total physical
> > > video outputs):
> > > https://www.asus.com/us/Motherboards/PRIME-B250M-C-CSM/
> > 
> > > 
> > > G4600 HD Graphics 630 CPU
> > 
> > > 
> > > Server 1.20.0 (openSUSE Tumbleweed)
> > 
> > > 
> > > kernel 4.17.4
> > 
> > > 
> > > Xorg driver: modesetting
> > 
> > > 
> > > Xrandr		Actual Cable
> > > Reports		Connectors
> > > DP-1		DisplayPort
> > > HDMI-1		----
> > > HDMI-2		HDMI
> > > HDMI-3		DVI
> > > DP-2		VGA
> > 
> > I understand your concern, but  as you can see there are adaptors
> > involved
> > here and they are decided by manufactures. From the driver
> > perspective the
> > protocol is the most important part, but that gets sometimes really
> > bad for
> > the users, I know.
> By "adaptors", do you mean logical adapters in motherboard firmware
> that maybe
> an update could improve?
> 
> > 
> > Honestly I don't know if there's a way to detect the presence of
> > adapters
> > like this DP to VGA for instance. I don't think so.
> > 
> > Afaik on HDMI-DP with LSPCON we do some tweak on the names to avoid
> > showing a misleading information, but that's is the further we can
> > go I'm afraid...
> Thanks for the reply.
> 
> BTW, DP daisy chaining the same motherboard I get the following:
> 
> Screen 0: minimum 320 x 200, current 4480 x 1200, maximum 8192 x 8192
> DP-1 disconnected primary (normal left inverted right x axis y axis)
> HDMI-1 disconnected (normal left inverted right x axis y axis)
> HDMI-2 disconnected (normal left inverted right x axis y axis)
> HDMI-3 disconnected (normal left inverted right x axis y axis)
> DP-2 disconnected (normal left inverted right x axis y axis)
> DP-1-8 connected 2560x1080+0+0 (normal left inverted right x axis y
> axis) 673mm
> x 284mm
>    2560x1080     60.00*+
>    1920x1080     60.00    60.00    50.00    59.94    24.00    23.98
>    1680x1050     59.95
>    1280x1024     75.02    60.02
>    1280x800      59.81
>    1152x864      75.00
>    1280x720      60.00    50.00    59.94  ...
> DP-1-1 connected 1920x1200+2560+0 (normal left inverted right x axis
> y axis)
> 519mm x 324mm
>    1920x1200     59.95*+
>    1920x1080     60.00    59.94
>    1680x1050     59.95
>    1400x1050     59.98
>    1280x1024     60.02
>    1440x900      59.89
>    1280x960      60.00
>    1280x800      59.81
>    1280x720      60.00    59.94  ...
> 
> That logic looks backwards to me. DP-1-8 is the screen in the middle
> of the
> cable chain. :-p

"8" happens to be the logical port number. Logical because the port is
internal to a multi-function DP device (it contains both a branch and a
sink). DP spec says logical port numbers start from 8.


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