[Wayland-bugs] [Bug 94476] DRM backend does not search for i915_dri.so

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94476

--- Comment #4 from gobogowoli at dlemail.ru ---
Sorry for the erroneous bug report. When it comes to the Linux graphics stack,
I still only know just enough to be dangerous. I did look into libgbm since the
error was labeled, but I couldn't readily find any documentation about it. I
don't quite know where the lines are drawn between Weston, Mesa, DRI/DRM, etc.

Weston, Mesa, and at least all of their direct dependencies are installed via
Gentoo Portage, so in theory they should be coherent with one another. However,
I have to do some more testing to figure out why Mesa is installing modules in
/usr/lib64/mesa and libgbm is searching for them in /usr/lib/dri. It's likely
that I messed something up along the way, but if not it's a bug for the Gentoo
(or perhaps Mesa) people I suppose. I only did the symlinks as a quickfix; I'm
more concerned about libgbm searching for i965_dri.so instead of i915_dri.so,
regardless of the parent directories.

Since libgbm is part of Mesa (which I didn't know until now), I'll look for
some more documentation on it and see if there's some way to force libgbm to
choose i915_dri.so specifically. I'll submit a bug report to Mesa also if
necessary.

As for which driver is actually being loaded, I'm assuming its swrast_dri.so,
since that's the only other one in /usr/lib64/mesa, and it would explain the
slowness. I attached the log in case anyone is interested.

So thanks for the explanation. I'll look into libgbm some more and see if I can
find a workaround or submit a bug report to Mesa.

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