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dpms problems with X 4?

Hello.  I'm having a strange problem with X 4.0.2 (woody) and my Energy
Star compliant Sony monitor.  I've configured X to use DPMS to turn off
the monitor after 10 minutes of inactivity with the following line in
        Option          "DPMS"
        Option "OffTime"  "10"

After the specified period of inactivity, the monitor appears to turn
itself off, but things get a bit weird.  After some time (a minute or
two) the monitor clicks as if waking up, and the power indicator
switches from solid orange to flashing orange/green.  Logging in to the
system from another machine and using xset to get the status of the 
monitor (yes, I'm talking to the right X server ;^) indicates that DPMS
is disabled.  Huh?  It was enabled before!  using 'xset dpms 0 0 600' or
'xset dpms force off' turns it off for a little while, but then it
reverts to its weird behavior again.

Until today I had power saving enabled in the system BIOS, but in an
attempt to isolate the problem I turned it off.  The symptoms remain
unchanged, though.

Has anybody else seen such a thing?  I don't remember it happening with
X3 under potato, but it's possible that I wasn't looking when it did.  


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