That wording implies this is Debian beignet (upstream beignet uses the
wording "cl_get_gt_device(): error, unknown device: %x"), which is 1.3.0
in stretch. This should support Bay Trail, but I don't have the
hardware to actually try this.
Please post the output of
xrandr --listproviders
glxinfo | grep " vendor\| renderer"
lspci -nn | grep -e "\[03..\]:"
Supported Bay Trail devices have ID [8086:0f31] in the last of these.
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