Hi all, this looks an aweful lot like my issue (that has only started after upgrading to 6.8 RC4 from 6.7).
I tried applying the syslinux line as follows:
default menu.c32
menu title UNRAID
prompt 0
timeout 50
label Unraid OS
menu default
kernel /bzimage
append intel_iommu=off initrd=/bzroot
label Unraid OS GUI Mode
kernel /bzimage
append initrd=/bzroot,/bzroot-gui
label Unraid OS Safe Mode (no plugins, no GUI)
kernel /bzimage
append initrd=/bzroot unraidsafemode
label Unraid OS GUI Safe Mode (no plugins)
kernel /bzimage
append initrd=/bzroot,/bzroot-gui unraidsafemode
label Memtest86+
kernel /memtest
Hardware transcoding is now starting again, as it did on 6.7.2, but the video is extremely glitched and blocky (unwatchable).
Anyone else with a J4105 having the same issue on 6.8?