Re: linux-c7 and opengl apps?

On Sat, Oct 6, 2018 at 1:39 PM Greg V <[email protected]> wrote:

>
>
> On Fri, Oct 5, 2018 at 11:21 PM, Theron <[email protected]> wrote:
> > % /compat/linux/opt/VirtualGL/bin/glxinfo | grep OpenGL
> > libGL error: MESA-LOADER: failed to retrieve device information
>
> Do you have linsysfs mounted?
>
> Try reading /compat/linux/sys/class/drm/card0/device/uevent.
>
> Mesa won't retrieve device information without linsysfs.
> I wrote the linsysfs patch that exposed the info there so that recent
> Mesa would work :)
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222375
> (Wow, that was a year ago… interesting note from there: you might
> need to set LIBGL_DRI3_DISABLE=1 for Linux apps)
>


Thank you Greg!  LIBGL_DRI3_DISABLE=1 was it for me! Now I can run OpenGL
apps with linux-c7 :)


>
> Also, what's with the "/opt/VirtualGL"? Are you using mesa from
> linux-c7 or something… weird?
>
> > This problem has existed forever.  I am not sure it is actually a
> > fault in Linux emulation, as these very same symptoms ("failed to
> > retrieve device information" message, console freeze) existed back in
> > FreeBSDDesktop/freebsd-base-graphics days when attempting to run
> > purely FreeBSD OpenGL apps.  At the time the workaround was a patch
> > to Mesa's GPU detection; the underlying kernel problem wasn't
> > addressed.
>
> There was a somewhat related issue (but not the same one, FreeBSD and
> Linux versions of mesa/libdrm use different mechanisms to get device
> info).
> Mostly affected Wayland-EGL clients — they would try to access
> /dev/dri/card408 instead of /dev/dri/card0, fail to get info and fall
> back to software rendering.
> I fixed it a while ago:
>
> https://gitlab.freedesktop.org/mesa/mesa/commit/db8519a369261cdedda50852facc45616d4eba28
>
> But I never saw console freezes when Mesa couldn't properly detect the
> GPU o_0
>
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