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On some boards the residual current DAC outputs can draw when they're disconnected can be high enough to give a false load detection positive (I've only seen it in the S-video luma output of some cards, but just to be sure). The output line capacitance is limited and sampling twice should fix it reliably. Signed-off-by: Francisco Jerez <currojerez@riseup.net> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>