Cisco chs 335 freezes for 30 sec when sony tv turns on

[rbrown24]

I recently hooked up a Sony kdl-46ex400 via hdmi to a cisco chs335 settop.  I noticed that when I turn on the TV, the settop does not respond for several seconds (maybe 30 sec) to remote control commands.  The channel that was previously tuned is still being displayed ok--it's just the control of the settop is lost for a while.  The power led doesn't even flash to indicate that the settop received the command.

So far I have tried turning off control over HDMI (HDMI-CEC) on the TV and nothing changed.  I contacted Sony yesterday.  They confirmed I have the latest TV firmware, but otherwise don't have any ideas.  I suspect there is something going on with the hdmi interface at TV startup that is causing this glitch on the settop.  I will also try a component connection, but wondering if anybody else has noticed this problem.  I have several of this model settop hooked up via hdmi to different TVs and they seem ok.

[rbrown24]

Further searching reveals that this is likely an IR interference problem with the LCD backlighting when the TV is first turned on.