Re: Second screen - DisplayPort

[amuza]

Thank you.

dmesg shows nothing at all when connecting to the DisplayPort port of my 
docking station.

However, when connecting to the mini DisplayPort port of the laptop 
itself, it shows this message repeatedly:

[27925.506913] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 
103048 [ PRIVRING ]
[27925.506929] nouveau 0000:01:00.0: bus: MMIO write of 00000000 FAULT 
at 103048 [ PRIVRING ]
[27932.624065] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 
103048 [ PRIVRING ]
[27932.624082] nouveau 0000:01:00.0: bus: MMIO write of 00000000 FAULT 
at 103048 [ PRIVRING ]
[27939.367201] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 
103048 [ PRIVRING ]
[27939.367217] nouveau 0000:01:00.0: bus: MMIO write of 00000000 FAULT 
at 103048 [ PRIVRING ]
[27946.522991] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 
103048 [ PRIVRING ]
[27946.523008] nouveau 0000:01:00.0: bus: MMIO write of 00000000 FAULT 
at 103048 [ PRIVRING ]
[27953.348859] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 
103048 [ PRIVRING ]
[27953.348875] nouveau 0000:01:00.0: bus: MMIO write of 00000000 FAULT 
at 103048 [ PRIVRING ]
[27960.178545] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 
103048 [ PRIVRING ]
[27960.178561] nouveau 0000:01:00.0: bus: MMIO write of 00000000 FAULT 
at 103048 [ PRIVRING ]
[27967.366446] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 
103048 [ PRIVRING ]
[27967.366462] nouveau 0000:01:00.0: bus: MMIO write of 00000000 FAULT 
at 103048 [ PRIVRING ]
[27974.431155] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 
103048 [ PRIVRING ]
[27974.431172] nouveau 0000:01:00.0: bus: MMIO write of 00000000 FAULT 
at 103048 [ PRIVRING ]
[27980.786265] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 
103048 [ PRIVRING ]
[27980.786281] nouveau 0000:01:00.0: bus: MMIO write of 00000000 FAULT 
at 103048 [ PRIVRING ]


With Trisquel it worked good on both ports (normal DisplayPort of the 
docking station and mini-DisplayPort of the laptop itself).




Leo Famulari:
> DiaplayPort is a (mostly) display interface standard that is unrelated to HDMI:
>
> https://en.wikipedia.org/wiki/DisplayPort
>
> Amuza, does Linux register connections to your DisplayPort interface? You can 
> check the output of dmesg.
>
> What kind of CPU architecture are you using? Maybe some kernel config flag 
> needs to be changed.
>
> On Wed, Jun 23, 2021, at 12:27, Joshua Branson wrote:
> > amuza <amuza@riseup.net> writes:
> >
> > > Hello!
> > >
> > > I'm new to Guix system, yesterday I installed it for the first time. I
> > > installed it with i3 and Mate.
> > >
> > > I would like to use my second monitor, but its DisplayPort connection is
> > > not recognized by xrandr. xrandr only shows my own laptop's screen.
> > >
> > > If I connect my second monitor through VGA, xrandr does detect that VGA
> > > connection.
> > >
> > > The DisplayPort connection worked fine with Trisquel, I could use my
> > > second monitor, so I guess it's not an issue on software Freedom.
> >
> > I wish I knew how to help...What's the main difference between HDMI and
> > display port?  Does display port allow one to send video and audio down
> > the wire?
> >
> > > Any suggestion on how to make Guix detect my DisplayPort-connected monitor?
> > >
> > > Thank you!
> >
> > --
> > Joshua Branson (joshuaBPMan in #guix)
> > Sent from Emacs and Gnus
> >    https://gnucode.me
> >    https://video.hardlimit.com/accounts/joshua_branson/video-channels
> >    https://propernaming.org
> >    "You can have whatever you want, as long as you help
> > enough other people get what they want." - Zig Ziglar