[fedora-arm] Re: Funny display on Raspberry Pi

On 16/04/2020 11:53, Peter Robinson 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
> We've found the upstream driver, vs the one that is downstream that a
> lot of other distros seem to use is quite finicky with some devices, I
> would try swapping out your HDMI cable, that has fixed detection
> issues for a lot of people.

I'll try that, but I need to get hold of a new cable first.

But note: /dev/dri is missing when I experience the problems. Can a poor
connection actually cause that?

- Toralf


>
>> $ 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.
>>
>>
>>
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