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Old 05-23-2008, 11:08 AM
Lawrence Curington
 
Default Bug#482531: DPMS off mode issue with

Package: linux-image-2.6.18-6-686
Version: 2.6.18.dfsg.1-18etch3

I've noticed that since I've upgraded from
linux-image-2.6.18-6 version 2.6.18.dfsg.1-18etch1
that I have been having issues with DPMS off mode.
This began after the following upgrade: '[UPGRADE]
linux-image-2.6.18-6-686 2.6.18.dfsg.1-18etch1 ->
2.6.18.dfsg.1-18etch3'. it is also present in version
2.6.18.dfsg.1-18etch4 as well. All other versions of
Debian kernels that I've ran have not exhibited this
issue. So I have a strong feeling the bug was
introduced in 1-18etch3.

What happens is that sometimes the system will not
come out of DPMS off mode. This issue only happens at
the virtual console, where as in Xorg, DPMS works just
fine. The problem is a bit intermittent, but I have a
found a way to make it happen more frequently, which
I'll get into more detail further down. Essentially,
when the buggy DPMS behavior happens, I'll tap a key
like you normally do to get the display to come out of
DPMS (power save mode) when at the console, but in
this case it will show the display for a half second
then go right back into DPMS off mode. The only way
to bring it out of this buggy DPMS state is to pull
the plug on my LCD monitor to have it completely power
down/reset.

What tends to trigger it the most is when I exit xfce4
(version 4.3.99.2). As soon as it exits Xorg from
there and goes back to the virtual console it goes
into the buggy DPMS state described above. I've
noticed that it tends to happen more rarely when
exiting icewm (version 1.2.28-4). However, sometimes
it will happen just when the virtual console has had a
chance for be idle enough for DPMS off mode to kick
in.

Just for reference, this is in Debian Etch/stable
which you may have already guessed from the versions
of the packages I described above.



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