Two displays crash it... about android_kernel_brcm_rpi HOT 5 CLOSED

Thanks for the detailed report.

Dual HDMI is not well supported (if at all) with the KMS driver on Linux 5.4 kernel. Pi 4 KMS driver has been further improved in 5.10 kernel where this should be possible among other things (DSI display support, etc). Plan was to switch to 5.10 with Android 12 but that's probably now also on hold due to other issues (no HDMI audio available on that one).

There's also no support for switching between displays on Android side so there's a long way to go for anything like this to be actually usable.

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So, I don't know much about how you built this and hadn't dug in so I may ask some potentially idiotic questions but start with I appreciate everything you've done with this I'm sure other people are getting a lot of use out of it and it's cool to see android running on Pi especially a better performing version than the glodroid pre-release that's 'released'.

Does glodroid not use the KMS driver? or the 5.4 kernel?
Would it be possible for me to build the 5.10 kernel and kind of mix and match with your android 11 build?

Last, I don't think switching between displays is really necessary. If you mean like user-based switching, as far as I understand one display becomes the 'primary' display and the other is the 'presentation' display sort of like how casting makes an additional virtual display in the context of the Android API from the software/userland prospective.

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Roman from GloDroid has done the work upstreaming the required graphics support so it's mostly thanks to him how things in that regard are set up in my builds as well. There shouldn't be any major difference in performance unless you're using some very high display resolution (4k) on other.

Yes, GloDroid uses KMS but 5.10 kernel.

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Yes, GloDroid uses KMS but 5.10 kernel.

Is that graphics support/5.10 kernel there in the v6.0 pre-release or is that stuff from his "Next" branch? I was running the 6.0 pre-release image; still trying to get the repo to sync in order to build the Next branch.

But the performance was terrible even at the launch screen both displays were 1080p, meanwhile running this everything ran great minus that display support so it was odd. I had seen you did borrow some code from there and figured it may perform just the same but was surprised when it performed really well.

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I'm not the right person to ask and this is not the right place to discuss it.

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