I did an apt-get upgrade and didn't consider the sort of breakage that could
occur if the system were to replace
/usr/lib/xorg/modules/extensions/libglx.so with
*not* the Nvidia one.
I had some erroneous messages in
/var/log/Xorg.0.log that made me think the
problem was because of some undefined symbols in some mesa library, but that
turned out to be missing symbols in the fallback software rendering, not the
actual GLX module.
To fix the error, I extracted the relevant parts from the original setup script
and ran them again. Here's the extracted bit:
l4tdir=`mktemp -d`
l4t=Tegra124_Linux_R19.3.0_armhf.tbz2
wget -P ${l4tdir} https://developer.nvidia.com/sites/default/files/akamai/mobile/files/L4T/${l4t}
cd ${l4tdir}
tar xvpf ${l4t}
cd Linux_for_Tegra/rootfs/
tar xvpf ../nv_tegra/nvidia_drivers.tbz2
tar cf - usr/lib | ( cd / ; tar xvf -)
cat > install-tegra.sh << EOF
update-alternatives --install /etc/ld.so.conf.d/arm-linux-gnueabihf_EGL.conf arm-linux-gnueabihf_egl_conf /usr/lib/arm-linux-gnueabihf/tegra-egl/ld.so.conf 1000
update-alternatives --install /etc/ld.so.conf.d/arm-linux-gnueabihf_GL.conf arm-linux-gnueabihf_gl_conf /usr/lib/arm-linux-gnueabihf/tegra/ld.so.conf 1000
ldconfig
EOF
And a
pastebin version because blogger butchering.
