[agl-discussions] UP2 board DP connection?

[Takashi Matsuzawa]

Hello.
Just tried alternative ("active") DP to HDMI cable and the display lit up even if the cable is connected to DP port.

________________________________________
From: Dinh, Kien T <kien.t.dinh at intel.com>
Sent: Friday, February 16, 2018 8:15 PM
To: VanCutsem, Geoffroy; Takashi Matsuzawa; automotive-discussions at lists.linuxfoundation.org
Subject: Re: [agl-discussions] UP2 board DP connection?

Matsuzawa-san,

I think you can try with the DP to HDMI active adapter. On the Up squared forum they reported that the active one worked instead of passive one.

Regards,
Kien

On 2018/02/16 19:52, "automotive-discussions-bounces at lists.linuxfoundation.org on behalf of VanCutsem, Geoffroy" <automotive-discussions-bounces at lists.linuxfoundation.org on behalf of geoffroy.vancutsem at intel.com> wrote:

    Hi Matsuzawa-san,

    > -----Original Message-----
    > From: Takashi Matsuzawa [mailto:tmatsuzawa at xevo.com]
    > Sent: Friday, February 16, 2018 10:55 AM
    > To: VanCutsem, Geoffroy <geoffroy.vancutsem at intel.com>; automotive-
    > discussions at lists.linuxfoundation.org
    > Subject: Re: UP2 board DP connection?
    >
    > Hello.
    > Thank you for your info.
    >
    > I just tried and output is like this.
    >
    > So, DP-1 is seen by Linux kernel but there is no display connected?
    > But I am actually connecting my display (powerd on) to DP, but using DP<-
    > >HDMI conversion cable.
    >
    > Cable is wrong?(I should have avoided a cheap one??) Unfortunately his is
    > the only (full)DP cable in my office, so I cannot try another today..

    I don't have a UP Squared board to test with but this is a possibility. I would try booting a live distribution (Ubuntu/Fedora) from a USB stick and look at the output reported there (just to rule out something to do with AGL itself).

    I must confess that I tend to stay away from cheap cables these days, I've had too many issues with them in the past and it usually ends up costing me more in troubleshooting time than the extra money needed to buy a good quality one. I would definitely try different cables (DP-to-HDMI adapter) and also make sure the HDMI cable itself is good (try swapping it out with the one you have connected to the UP Square board HDMI connector now).

    >
    > >Connector info
    > >--------------
    > >connector 51: type DP-1, status: disconnected
    > >        DPCD rev: 0
    > >        audio support: no
    > >        DP branch device present: no
    > >        modes:
    > >connector 58: type HDMI-A-1, status: connected
    > >        name:
    > >        physical dimensions: 520x320mm
    > >        subpixel order: Unknown
    > >        CEA rev: 3
    > >        audio support: yes
    > >        modes:
    > >                id 62:....
    >
    > ________________________________________
    > From: VanCutsem, Geoffroy <geoffroy.vancutsem at intel.com>
    > Sent: Friday, February 16, 2018 6:16 PM
    > To: Takashi Matsuzawa; automotive-discussions at lists.linuxfoundation.org
    > Subject: RE: UP2 board DP connection?
    >
    >
    >
    > > -----Original Message-----
    > > From: automotive-discussions-bounces at lists.linuxfoundation.org
    > > [mailto:automotive-discussions-bounces at lists.linuxfoundation.org] On
    > > Behalf Of Takashi Matsuzawa
    > > Sent: Friday, February 16, 2018 1:40 AM
    > > To: automotive-discussions at lists.linuxfoundation.org
    > > Subject: Re: [agl-discussions] UP2 board DP connection?
    > >
    > > By the way, the following method of knowing output display names works?
    > >
    > > >$ journalctl |grep Output
    > >
    > > I Tried this on my UP2 board with master snapshot and ee 5.0.1 but
    > > could not get HDMI-A-1 from it.
    >
    > If your kernel has the debug filesystem option turned on (and debugfs is
    > actually mounted), you should be able to see all display outputs available
    > (whether connected or not) in /sys/kernel/debug/dri/0/i915_display_info. I
    >
    > >
    > > Looking into weston.log in /run/..., I can see HDMI-A-1 name.
    > > Will I see two Output names if I connect two displays to this board
    > > and everything works well?
    > >
    > > ________________________________________
    > > From: Takashi Matsuzawa
    > > Sent: Thursday, February 15, 2018 2:48 PM
    > > To: automotive-discussions at lists.linuxfoundation.org
    > > Subject: UP2 board DP connection?
    > >
    > > Hello.
    > >
    > > I am playing with my UP2 board, connecting two displays to the board,
    > > one to HDMI port and another to DP (not eDP) port.
    > > (The board has HDMI/DP stacked socket).
    > >
    > > I can see only HDMI port is working, and DP is not.
    > > (After power-on, BIOS screen and after are only displayed on the
    > > display attached to HDMI port).
    > >
    > > Is there how-to information of the either or both of below?
    > >
    > > - Use DP as my display (connect my display to DP, boot my board and
    > > see BIOS and after are displayed on the display).
    > >
    > > - Enable both HDMI and DP displays (connect two displayes to HDMI port
    > > and DP port, and let the system recognize that I have two displayes
    > > attached to the board).
    > >
    > > I looked into the BIOS setting menus, but I am not sure if I have
    > > options for this there.
    > >
    > > Any comment or suggestion is appreciated.
    > > _______________________________________________
    > > automotive-discussions mailing list
    > > automotive-discussions at lists.linuxfoundation.org
    > > https://lists.linuxfoundation.org/mailman/listinfo/automotive-discussi
    > > ons
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