On 10/24/24 3:17 AM, Peter Robinson via arm wrote:
On Wed, 23 Oct 2024 at 21:19, Brandon Nielsen via arm
<arm@xxxxxxxxxxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxxxxxx <mailto:arm@xxxxxxxxxxxxxxxxxxxxxxx>> 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"
I will if I ever manage to reproduce the issue repeatably. I haven't
been able to make it happen again today.
--
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