commit 4eb59793 upstream.

Disable PX on these systems.

bug: https://bugs.freedesktop.org/show_bug.cgi?id=101491Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>