Re: Funny display on Raspberry Pi

Toralf Lund <toralf@xxxxxxxxxx> · Sat, 4 Apr 2020 22:48:22 +0200

    On 04/04/2020 11:38, Toralf Lund wrote:

      I've now tried a clean(er) install on
        the system, and still have this problem. Essentially, what I did
        was

          Download "Fedora Minimal" and write it to the SD card.
          Boot up the system in text mode
          dnf groupinstall MATE base-x
          systemctl set-default graphical-target

        After this, I have a similar problem. Somehow the colours
          don't look quite as bad this time, but the resolution is
          clearly not right. xrandr reports

    No, wait. The problem is actually intermittent. Sometimes
      everything works (after a reboot), and I just found that when it
      does, I have
    $ ls /dev/dri/

      by-path  card0  renderD128

    $ ls /sys/class/drm

      card0              card0-HDMI-A-1     renderD128

      card0-Composite-1  card0-Writeback-1  version

    In cases where I get the problem, on the other hand, /dev/dri is
    missing, and /sys/class/drm only contains the version file.

    - Toralf

      Screen 0: minimum 1824 x 984, current
        1824 x 984, maximum 1824 x 984

        default connected 1824x984+0+0 0mm x 0mm

           1824x984      77.00

      I'd really like to track this down
        further to a component the may cause the issue (or log that
        could tell me what's wrong), but quite frankly, I don't know
        where to start looking. One clue, though, I installed and ran
        "monitor-edid", and it said:

      [toralf@lille-hjelper ~]$ sudo
        monitor-edid

        [toralf@lille-hjelper ~]$ 

      Yep, that's right. Absolutely
        nothing. In earlier releases, it has given me actual data for
        the display.

      - Toralf

      On 26/03/2020 19:39, Peter Robinson
        wrote:

          I have a Raspberry Pi 3B running Fedora AAarch connected to my TV.

After installed the latest version 31 updates, the display went weird on
me. Monitor preferences list an "unknown" monitor with resolution
1824x984 and refresh rate 77 Hz, and colours are all wrong. What should
be red or orange is blue, blue is red or brown, and I'm not really sure
what everything else I see on the screen is supposed to look like, but
the greens may be more or less right.

Any idea what's going on?

        No, but then I've not ran F-31 on a RPi for a month or two, I tend to
move to dev releases pretty quickly and don't regularly use desktop
UXes in testing.

First question is what updates were applied, the most likely
candidates are kernel and mesa. If you reboot into the previous kernel
does it start working again? How long between the updates, was it
days/weeks/months since you last updated and rebooted?

          I'm using the MATE desktop.

        Custom image? Anything else custom or did you start with
minimal/workstation/xfce and cross grade?

          If I connect my CentOS 7 laptop to the same HDMI port using the same
cable, everything seems just fine.

        Well that's a mostly irrelevant comparison because none of the
software is anywhere near Fedora.

_______________________________________________
arm mailing list -- arm@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe send an email to arm-leave@xxxxxxxxxxxxxxxxxxxxxxx
Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives: https://lists.fedoraproject.org/archives/list/arm@xxxxxxxxxxxxxxxxxxxxxxx