Thanks for the patch.

This does a fair job of avoiding an explicit crash whenever DDC is
unavailable.

When that happens, restricting available modes to those that AMD
considers safe i.e. Panel-friendly modes, is indeed a promising
strategy.

However, that strategy doesn't guarantee that the selected mode is
something that the connected VGA monitor can handle. It's a shot in the
dark and the mode we try, 1920x1440, is a large enough size (and an
uncommon enough resolution) that we cannot consider that shot in the
dark to be a safe one.

Thinking out loud, 800x600, 1024x768 or 1280x1024 would probably be
safer modes to attempt whenever DDC is unavailable, pretty much in that
order.

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https://bugs.launchpad.net/bugs/873942

Title:
  xf86-video-geode: driver initialization fails on Geode LX if DDC pins
  are configured for serial console

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