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[warmcat <894073@xxxxxxxxxxxxxxxxxx>]

At request of Seb, we backported Tomi's hdmi patches that went upstream
after 3.1 release from tracking to tilt-3.1.  They provide some good
architectural improvements but expose a big problem with two heads on
dss, there is no mediation about who owns the common pll.  Result is
that i had to disable the new dvi "panel" driver to stop hdmi
workability getting destroyed by dvi resetting the pll to something
else.

I discussed with Tomi he says he may add support for pll management but
'no promises'.  In themeanwhile best way is deconfigure dvi panel (i
guess you didn't configure it) and just use hdmi.

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https://bugs.launchpad.net/bugs/894073

Title:
  [regression] No DVI output on the PandaBoard with kernel 3.1.0-1402
  -linaro-lt-omap

Status in Linaro Texas Instruments Landing Team:
  New
Status in Linaro Ubuntu Evaluation Builds:
  Confirmed

Bug description:
  Just upgraded my packages, this pulled in linux-image-3.1.0-1402
  -linaro-lt-omap. After a reboot, there is no output on the DVI
  monitor. After restoring the boot partition from yesterday's backup
  (switching back to 3.1.0-1401-linaro-lt-omap), the DVI output works
  again.

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