I haven't got my head around what the differences are with -copy options. I'm able to use drm-copy but it produces a small stutter when watching 1080p hevc content whereas drm is very smooth. As previously mentioned, drm-copy does allow mpv to display videos with problematic file widths instead of just a black screen. I don't understand it all enough to know why that is.

I think building a new image is probably beyond me at the moment. I uninstalled the existing headers, rebooted and installed the updated headers and rebooted. The issue persists. I'm just going to give up on it. I don't really need to LCD display to work. I just wanted confirmation I wasn't missing something stupid. Thanks.

hm yes. I am not a Linux guru and would have liked to get a base for an up-to-date omv8. For me to just burn a recent armbian image on a Odroid hc2 - what a schmuck can do based on simple how-to's - this is not it. I see that you would have to modify the sd card up-front with either a key entrance to ssh or with another user. Console is "out" for a headless install and I do not have an XU4 so that you could do console/hmi supported install first steps. I think I call it a day. Thanks for all the support.

The patches that were available out-of-tree for a long time were a kind of hack using the DRM subsystem for decoding. For inclusion in mainline, they were further developed into a more correct request method. It is hwdec=v4l2request-copy in fact, because the stateless decoder is an m2m device and the scan-out is still carried out via the DRM subsystem. However, the copy is cheap because it is executed via dmabuf as zero copy.

I found a workaround: disabling BSS transition management from AP to STA seems to work. There won't be roaming on AP's request obviously. wpa_cli set disable_btm 1 or in Debian's interfaces configuration file: iface wlan0 inet dhcp wpa-ssid YourSSIDJere wpa-psk blablabla post-up wpa_cli set disable_btm 1 Regular roaming (device-initiated) still works fine.