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

Greg Gorsuch thewatchman at gmail.com
Fri Aug 11 19:21:29 UTC 2017


Not that I see. Also, I don't think it does this since when I change the
input from say mDP to DP it forces me to change the input from a menu
manually.

On Fri, Aug 11, 2017 at 3:15 PM, Alex Deucher <alexdeucher at gmail.com> wrote:

> On Fri, Aug 11, 2017 at 3:08 PM, Greg Gorsuch <thewatchman at gmail.com>
> wrote:
> > Your description sounds about right. Since I do see a message ("Entering
> > energy saver mode") come up on the monitor when I move the mouse as I
> > mentioned before, this does suggest it has been awakened and becomes
> > unrigistered at this point and sees no input anymore (hence the message).
> > All the windows are already moved to the other monitor at this point and
> the
> > screen saver seems like it has more or less died (though it does prompt
> for
> > the password and allows me to log in).
> >
> > I did what you asked, but it didn't really give any useful info since it
> > normally takes a while for the monitor to fail to come back up (maybe 5
> or
> > 10 minutes after I lock the screen even with the sleep time as 1 minutes
> or
> > so).  I kind of already generated the info you may be seeking in my
> original
> > post.
> >
> > 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.
>
> Does the monitor have an option to disable input polling?  Some
> monitors rotate through their inputs when they are not getting a
> signal to see if one attaches so they can automatically switch to that
> input.  This often confuses drivers because the input switching on the
> monitor often triggers a hotplug event which looks like the display
> has been disconnected to the driver since the monitor has switched to
> another input.
>
> Alex
>
>
> >
> >
> > On Thu, Aug 10, 2017 at 9:55 AM, Thomas L├╝bking <thomas.luebking at gmx.de>
> > wrote:
> >>
> >> On Wed, Aug 09, 2017 at 11:39:06AM -0400, Greg Gorsuch wrote:
> >>>
> >>> Where are the sleep logistics handled? Is it with the X server, the
> >>> NVIDIA
> >>> drivers, the Linux Kernel, or somewhere else? Is it possible to capture
> >>> the
> >>> communications on Windows 10 to identify how it is being handled. I
> don't
> >>> get the feeling it should be that complex to fix or at least implement
> a
> >>> work around since xrander is able to bring the monitor back online.
> >>
> >>
> >> It sounds like when you go dpms off, the monitor unregisters and when
> >> you go dpms on, the monitor re-registers.
> >> Then some semi-smart randr daemon kicks in and adjusts the layout, but
> >> does not so when the monitor comes back.
> >>
> >> Try to log the setup in the various modes:
> >>
> >> xset dpms force standby; sleep 10; xrandr --current > ~/randr.standby;
> >> xset dpms force suspend; sleep 10; xrandr --current > ~/randr.suspend;
> >> xset dpms force off; sleep 10; xrandr --current > ~/randr.off; xset
> >> dpms force on
> >>
> >> Also try the behavior on a "naked" X11 server (no desktop session, only
> >> an xterm) to see whether some client or the server adjusts the randr
> >> setup.
> >>
> >> Cheers,
> >> Thomas
> >
> >
> >
> >
> > --
> > Greg Gorsuch
> >
> > _______________________________________________
> > xorg at lists.x.org: X.Org support
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>



-- 
Greg Gorsuch
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