[Regression] [PATCH] intel_crt_detect_ddc() seems to be broken for DVI-I

"David Müller (ELSOFT AG)" d.mueller at elsoft.ch
Thu Jan 6 03:11:38 PST 2011


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.

The patch below adds an additional check to make sure that there is
really an analog device attached (similar to the "Mac mini hack" in
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