Builroot for raspberry pi4 32bit with x11 support generates an mistake. "Package buildroot-20210520.tar.bz2" An error occurs when xstart is called. The error returns the fbturbo_drv.so. Comment from Xorg.0.log: Failed to load /usr/lib/xorg/modules/drivers/fbturbo_drv.so: /usr/lib/xorg/modules/drivers/fbturbo_drv.so: undefined symbol: fbdevHWSave I think we need a update from the xf86-video-fbturbo library.
(In reply to jwack from comment #0) fbdevHWSave() is defined here [1], so this looks more like a module loading order problem, see e.g. [2] for similar example... If not please provide a minimal (but complete) defconfig against plain buildroot version to reproduce the problem... [1] https://gitlab.freedesktop.org/xorg/xserver/-/blob/master/hw/xfree86/fbdevhw/fbdevhw.c#L748 [2] http://lists.busybox.net/pipermail/buildroot/2021-May/310053.html
Same/similar failure was reported on the buildroot mailing list '[Buildroot] [RPi4] Enable GTK3 on Buildroot' (see [1]) providing an buildroot config file to reproduce the failure. Should be fixed with suggested buildroot patch, see [2]. [1] http://lists.busybox.net/pipermail/buildroot/2021-June/311763.html [2] https://patchwork.ozlabs.org/project/buildroot/patch/20210602201529.6210-1-ps.report@gmx.net/
This was fixed a long time ago in https://git.buildroot.org/buildroot/commit/package/x11r7/xdriver_xf86-video-fbturbo?id=9dc2b4a4eee557d3d9e7df31e9d2e96f364a2f03. Thanks Peter for providing the fix!