Weird: xmms interrupted for 1/2 sec when switching off DFP monitor

Felix Kühling fxkuehl at
Wed Oct 13 05:49:57 PDT 2004

On Wed, 13 Oct 2004 14:23:03 +0200
Felix Kühling <fxkuehl at> wrote:

> Hi,
> I just observed a very strange phenomenon. When I switch off my DFP
> monitor (because DPMS is currently broken in the Savage driver) music
> playing in xmms is interrupted for about half a second and then resumes.
> When I switch on the monitor again I can also see two small spikes in
> the CPU usage diagram, one when switching the monitor off and one when
> switching it back on (the latter doesn't interrupt the sound though).
> Does the Xserver somehow react to a signal from the monitor in a way
> that would cause a long latency in music playback?

Never mind, it has nothing to do with the Xserver or the graphics card.
It's the USB hub integrated into the DFP. ;-) Apparently the monitor
switch turns off the hub too. I can see the corresponding hotplug events
in my kernel log. When I disconnect the joystick from the hub the sound
interruption goes away.

| Felix Kühling <fxkuehl at>            |
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