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Without CONFIG_FB in the subtarget configs, kmod-fb builds FB as a
module, which makes XEN_FBDEV_FRONTEND and FB_HYPERV visible with no
value in any config. A non-interactive kernel build then stops at the
syncconfig prompt for XEN_FBDEV_FRONTEND, which defaults to m on these
subtargets because XEN is enabled.
Set both drivers off: simpledrm, hyperv_drm and the hvc console cover
the display of these guests.
Fixes: b091137d79 ("x86: 64, generic: replace fbdev with simpledrm")
Signed-off-by: Daniel Golle <daniel@makrotopia.org>