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Bug#985121: linux-image-5.10.0-4-rt-arm64: KMS seems broken in vc4.ko

Cross-posted to 2 groups.

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Hi,

On 13/03/21 at 11:31 +0900, Ryutaroh Matsumoto wrote:
> Package: src:linux
> Version: 5.10.19-1
> Severity: normal
> Tags: upstream sid bullseye
> X-Debbugs-Cc: debian-arm@lists.debian.org
> Control: forwarded -1 http://lists.infradead.org/pipermail/linux-rpi-kernel/2021-March/008049.html
> 
> Dear Maintainer,
> 
> kmscube	0.0.0~git20210103-1 fails to start with the error message
> on Raspberry Pi 4B:
> 
> failed to set mode: Invalid argument
> 
> kmscube works fine on linux-image-amd64 and Raspberry Pi OS kernel
> with vc4.ko and v3d.ko loaded.
> Debian kernel without vc4.ko does not have KMS support on RPi4B.
> 
> If this is an issue in kmscube, please feel free to reassign.
> This has been reported to the upstream maintainer.

According to strace, it fails because /dev/dri does not exist.

My understanding is that 5.10 does not have DRI support for the RPI4.
There's still some work to do in the V3D driver for that (see the
discussion at the end of
https://github.com/lategoodbye/rpi-zero/issues/46 )

Lucas

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Bug#985121: linux-image-5.10.0-4-rt-arm64: KMS seems broken in vc4.ko Ryutaroh Matsumoto <ryutaroh@ict.e.titech.ac.jp> - 2021-03-13 03:40 +0100
  Bug#985121: linux-image-5.10.0-4-rt-arm64: KMS seems broken in vc4.ko Lucas Nussbaum <lucas@debian.org> - 2021-03-14 22:30 +0100
    Bug#985121: linux-image-5.10.0-4-rt-arm64: KMS seems broken in vc4.ko Ryutaroh Matsumoto <ryutaroh@ict.e.titech.ac.jp> - 2021-03-15 01:10 +0100
      Bug#985121: linux-image-5.10.0-4-rt-arm64: KMS seems broken in vc4.ko Lucas Nussbaum <lucas@debian.org> - 2021-03-15 09:10 +0100

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