[fedora-arm] Re: Raspberry Pi 4B+ testing

On Wed, 23 Oct 2024 at 21:19, Brandon Nielsen via arm
<arm@lists.fedoraproject.org> wrote:
>
> On 10/23/24 2:39 PM, Troy Dawson via arm wrote:
> > On Wed, Oct 23, 2024 at 12:16 PM Brandon Nielsen via arm
> > <arm@lists.fedoraproject.org <mailto:arm@lists.fedoraproject.org>> wrote:
> >
> > Hi all,
> >
> > I just noticed on my Pi 4B+ that display output on the second micro
> > HDMI
> > port (the one further from the USB-C power supply port) is corrupted.
> > The first port is fine.
> >
> > The corruption is visible as rainbow halos around text during boot, and
> > increasingly large areas of corruption after booting to a graphical
> > desktop (green dots, color shifts, etc.).
> >
> > I can confirm this with the Fedora 41 1.3 RCs for both KDE and
> > Workstation.
> >
> > Has anyone else seen this? I'm trying to rule out it just being a
> > hardware fault with my unit.
> >
> > Brandon Nielsen
> >
> >
> > I can confirm that, and thank you very much.
> > I had pulled an old monitor off a shelf to test and thought I was having
> > monitor problems.
> > I read your email, switched display ports on my rpi4b, and now it's working.
> >
> > Troy Dawson
> >
> >
>
> Oddly, I cannot make this happen consistently. My last 2 boots have been
> fine on either port. When things are "fine", I can also move the cable
> between ports with no issues.
>
> So far the only thing I have noticed is:
>
> "fedora kernel: vc4-drm gpu: swiotlb buffer is full (sz: 1146880 bytes),
> total 32768 (slots), used 938 (slots)"
>
> (and similar) appearing intermittently in the logs when the monitor is
> misbehaving.

Can you try bumping up the CMA reserved memory? In the
/boot/efi/config.txt file change the rpi4 "dtoverlay=cma,cma-256" line
to 384 or 512 and reboot. Check it's changed with 'dmesg | grep CMA"
--
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