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    drm/i915/crt: Check for a analog monitor in case of DVI-I · f5afcd3d
    David Müller 提交于
    Since Linux 2.6.36 the digital output on my system (855GME + DVI-I) is
    not working any longer. The analog output is always activated
    regardless of the type of monitor attached.
    
    The culprit seems to be intel_crt_detect_ddc(), which returns true as
    soon as an ACK from the EDID device is received. Obviously this
    approach does not work with DVI-I where the analog and digital outputs
    share a common DDC bus.
    
    In a similar manner to the shared DDC wire, ala the "Mac Mini Hack", we
    need an additional check to make sure that there really is an analog
    device attached to the DDC.
    Signed-off-by: NDavid Müller <d.mueller@elsoft.ch>
    Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
    Cc: stable@kernel.org
    f5afcd3d
intel_crt.c 16.4 KB