Compile and use rpi-backend on raspberry 2 gave always black screen after weston-launch

[Pekka Paalanen]

On Thu, 17 Sep 2015 11:13:19 +0200
Fabio Fantoni <fabio.fantoni at m2r.biz> wrote:

> Il 16/09/2015 18:00, Pekka Paalanen ha scritto:
> > On Tue, 15 Sep 2015 17:10:09 +0200
> > Fabio Fantoni <fabio.fantoni at m2r.biz> wrote:
> >
> >> Hi, I'm trying wayland with weston on raspberry 2, the system used is
> >> debian Sid plus latest kernel and drivers with rpi-update.
> >> Using weston from official package 1.8.0-3 with fbdev-backend.so but
> >> graphic seems to perform badly, so following this howto:
> >> http://wayland.freedesktop.org/raspberrypi.html I compiled it with
> >> rpi-backend.so and other raspberry specific options.
> >> Launching weston-launch gave me only black screen (the
> >> dispmanx_offline=1 is already set), system is still accessible with ssh
> >> (when I can kill weston process).
> >>
> >> I tried also to compile and use weston from git commit
> >> ca510d06dca3e47e434a50cee105e96c9e82599c but I had also same result with
> >> both normal user and root.
> >> I not found any warning or error in logs or other useful information for
> >> now.
> >> Can someone help me to solve or at least debug the problem and report
> >> any useful informations for solve it please?
> > Hi,
> >
> > could you post 'head config.log' from your Weston build directory,
> > and the log file contents from 'weston-launch &> log.txt'?
> 
> Thanks for your reply.
> See attachments, full config.log and build log of 1.8.0 build of debian 
> package changing configure parameters based on raspberry wiki page.
> weston.log is the output of weston-launch.
> weston.ini have config of the test, plus the the line commented of first 
> test from official debian package working but graphic seems to perform 
> badly.

Arguments to ./configure seem ok.

> > Can you exit Weston (or at least make the process exit, even if the
> > screen does not recover) by pressing ctrl+alt+backspace?
> 
> Pressing ctrl+alt+backspace exit correctly from weston with black screen 
> only.

So input works, good. Only gfx output is missing.

Your weston log looks ok, with one strange thing: "mesg: ttyname
failed: Inappropriate ioctl for device". I wonder where that comes from.

> > I'm not sure how hard it would be on your distribution, but trying
> > various old versions of the firmware and proprietary libs (always
> > use a matching set) you might find a version that works, in case
> > this is a firmware issue.
> 
> I automatically updated them with rpi-update, I don't have good 
> experience on arm, I did only few tests (mainly on raspberry pi 2), any 
> advice is appreciated.

If you look into the documentation of rpi-update, you should find how
to specify old versions: https://github.com/Hexxeh/rpi-update

Unfortunately I cannot tell what a good firmware revision might be.
Also, I don't think I've tried Weston on rpi2, only on rpi1. They
probably shouldn't differ in this respect, but who knows.

Maybe someone who actually has Weston/rpi-backend working could tell
his firmware revision. The distribution shouldn't matter as long as
rpi-update updates the libraries too.

Actually you might want to check if there are multiple copies of e.g.
libbcm_host.so, libvcos.so, libvchiq_arm.so or such. Using a wrong
version compared to your firmware might cause problems. Also try the
demos from
https://github.com/raspberrypi/firmware/tree/master/opt/vc/src/hello_pi
If things like hello_dispmanx don't show up, then the problem is with
the firmware or the proprietary libs for sure.


Thanks,
pq
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