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vc4-fkms-v3d not work on 4.14.y #909
I'm not using Raspbian, i prefer Gentoo for several reasons.
I don't know how config must be, but here my config.txt :
It doesn't matter whether you use Raspbian or Gentoo or something else for this, since the problem occurs in the kernel, and it also occurs with the official 4.14 beta kernel on Raspbian in any case. With KMS and the 4.14 kernel from Pi foundation it really is almost as if the DSI interface never existed.
In my attempt to troubleshoot the problem, I have observed that the usual line:
I've also noticed that the usual DSI-oriented modules such as panel_raspberrypi_touchscreen and rpi_backlight are not loaded during this problem, but loading them manually does nothing.
The problem continues to occur with the latest (today's) 4.14.7-v7+ beta kernel, but I don't know what version of the KMS driver goes into that.
Unfortunately I don't know whether this problem is in the firmware or the kernel, but KMS, DSI, and 4.14 just don't seem to be possible right now at all.
@amikvic You should probably have something like cma=128M@512 (first number should match your gpu_mem setting) and also disable_overscan=1 in your config.txt, but it won't make your display work in this case, sorry.
referenced this issue
Dec 26, 2017
I've poked around fkms a little. In Raspbian, it gets past kernel boot and into systemd before it hangs.
This is not what I expected, but that's a common theme this month with these video drivers. I can perhaps try single-user mode for more precise debugging, but now that I have true KMS working, I (probably, unless I find worse problems in KMS) have no further use for FKMS, so it would just be for curiosity.