Lost kwin compositing after most recent Mesa update

[Bengt Ahlgren]

Greg Rivers <gcr+kde-freebsd at tharned.org> writes:

> After the most recent Mesa update:
> 	Apr 11 20:13:39 pkg: mesa-libs upgraded: 17.3.1 -> 18.0.0 
> 	Apr 11 20:13:44 pkg: mesa-dri upgraded: 17.3.1_1 -> 18.0.0
>
> kwin stopped doing compositing/acceleration on a laptop with Intel Haswell graphics. KInfoCenter shows:
> 	Vendor: Intel Open Source Technology Center
> 	Renderer: Mesa DRI Intel(R) Haswell Mobile
> 	OpenGL/ES version: 3.0 Mesa 18.0.0
> 	Kernel module: i915
>
> The reason seems to be that kwin is looking for a 32-bit frame buffer,
> while the Intel driver is creating only 24-bit (see log excerpts
> below).
>
> Is this a bug, or a configuration error? Any advice?

Just a "me too" with Intel Ironlake graphics and mesa 18.0.1 (on FreeBSD
10.4-STABLE).

Bengt