R4xx mobility chips use atombios, which does not store
the LVDS_GEN_CNTL parameter setup like combios. Rather,
it's configured in LVDSEncoderControl. As such,
LVDS_GEN_CNTL is set wrong when on resume. Call
LVDSEncoderControl to set it properly.
Should fix fdo bug 25336
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>