[13:22] <ogra> juergh, have you seen my last comments on https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1881623 ? seems it is actually not related to modules at all but to the fact that USB is completely off with the 5.3 kernel on pi4/8GB while it works just fine with 5.4
[13:23] <ogra> (this is why my own build of teh focal tree works well an switching to the pi-kernel snap breaks the world ut seems)
[13:25] <juergh> ogra, yeah. waveform just notified me yesterday that it's a problem specific to the pi4 rev1.4.
[13:25] <ogra> well, are there plans to go for 5.4 eventually ? it seems to work just well
[13:27] <ogra> (for core18 i mean indeed, given that UC20 is still far out)
[13:29] <juergh> ogra, yes. but we don't have a kernel snap upgrade story yet due to DTB incompatibilities.
[13:30] <ogra> i thought the gadgets can do that now ... (it is indeed an issue with roll-back in case your update fails)
[13:31] <juergh> ogra, unfortunately no. there's an ordering issue with gadget and/or kernel snap refreshes you might end up rebooting into a new kernel with old DTBs or the other way around.
[13:32] <juergh> we'll have a 5.4 uc18 kernel snap in edge soon.
[13:32] <ogra> yeah, i know the issue, but i had hopes the new gadget update machanism could at least handle the forward path nowadays ... too sad :/
[13:32] <juergh> we talked about this yesterday and a plan is being worked on.
[13:33] <ogra> (the lockstep mess between kernel and gadget is an old issue ... )
[13:33] <ogra> ah, cool
[13:33]  * juergh is surprised we haven't been bitten before
[13:33] <ogra> because we never updated ;)
[13:34] <juergh> well. kernel snaps are refreshed and even within the same kernel version the DTBs might break.
[13:34] <ogra> it could be fixed by simply adding dtb load support to u-boot ... and not load the dtb from ram
[13:35] <ogra> i think that should work nowadays (it didnt when i initially developed the first pi images though, you had to use what the bootloader gave you in ram but i think u-boot evloved)
[13:35] <ogra> not sure if that would have any bad effects on GPU stuff though ...