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.
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