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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
XF86Config-4:
        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.  

Thanks.
noah

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