I noticed on a machine with Intel Graphics running 8.0-current with the
Xfce desktop that the xorg vulkan driver does not get loaded by
graphics/vulkan-loader. 'vulkaninfo' from vulkan-tools returns an error.
This is because /usr/local/bin/startxfce4 (which is installed by the
xfce4-session package) checks for the environment variable
XDG_DATA_DIRS, which is used by vulkan-loader to define the search paths
for the driver/loader json definitions.
If it is not previously defined, XDG_DATA_DIRS is set to
XDG_DATA_DIRS=/usr/share:/usr/local/share
and the files from the xbase80 set in /usr/X11R6/share/vulkan/icd.d are
therefore not found.
Rather than patching xfce4-session, a 'fix' might be to add
export XDG_DATA_DIRS=/usr/X11R6/share:/usr/share:/usr/local/share
to ~/.xsession
A note to this effect could be added to the pkg-readme/xfce file in
meta/xfce
As well as the 'vulkan ports', I believe this is relevant for Chromium
and friends if so configured.
Regards
Chris Billington
