[Intel-gfx] GMBUS: modprobe eeprom hangs forever (2.6.39 regression?)

[Andrew Lutomirski]

On two different Sandy Bridge machines, modprobe eeprom does this:

[   35.627075] [drm] GMBUS timed out, falling back to bit banging on
pin 0 [i915 gmbus disabled]
[   35.679006] [drm] GMBUS timed out, falling back to bit banging on
pin 0 [i915 gmbus disabled]
[   35.730938] [drm] GMBUS timed out, falling back to bit banging on
pin 0 [i915 gmbus disabled]
[   35.782889] [drm] GMBUS timed out, falling back to bit banging on
pin 0 [i915 gmbus disabled]
[   35.834804] [drm] GMBUS timed out, falling back to bit banging on
pin 0 [i915 gmbus disabled]
[   35.886739] [drm] GMBUS timed out, falling back to bit banging on
pin 0 [i915 gmbus disabled]
[   35.938654] [drm] GMBUS timed out, falling back to bit banging on
pin 0 [i915 gmbus disabled]
[   35.990588] [drm] GMBUS timed out, falling back to bit banging on
pin 0 [i915 gmbus disabled]
[   36.042539] [drm] GMBUS timed out, falling back to bit banging on
pin 1 [i915 gmbus ssc]

and hangs forever.  100% reproducible, and it might be a 2.6.39 regression.

Maybe this is a hint for some of the display-detection issues.

--Andy