Dell P2715Q Monitor does not wake up after sleep (off, standby, or suspend)

Greg Gorsuch thewatchman at
Sat Aug 12 18:28:03 UTC 2017

Actually, I was looking at the output from the xrander -q I posted in my
first e-mail. It does show the display as connected still, but just drops
the resolution from it (apparently indicating it is deactivated by X but
not disconnected). So it doesn't seem like the udev rule would help.

I have tried udevadm monitor and do not see any events. I also tried adding
a rule  UBSYSTEM=="drm", ACTION=="change",
but it doesn't seem like that ever gets executed.

Where is the logic for deactivating monitors and waking up from sleep
actually handled? Is it the kernel, nvidia driver, X server, or somewhere
else? Somehow Windows 10 does not seem to have the same issue.

On Sat, Aug 12, 2017 at 6:44 AM, Thomas L├╝bking <thomas.luebking at>

> On Fri, Aug 11, 2017 at 03:08:40PM -0400, Greg Gorsuch wrote:
>> I am wondering if there is some way to just "lock" the setup so that the
>> monitor is always there if it is a registration problem, or change things
>> so the monitor is not unrigestering itself.
> Hardly for DP and proably driver specific anyway, but you could maybe
> setup an udev hook to auto-fix your stuff, see eg.
> Cheers,
> Thomas

Greg Gorsuch
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