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

Gregory Gorsuch thewatchman at gmail.com
Mon Aug 7 15:11:46 UTC 2017


*Overview:*

    I am having an issue with my Dell P2715Q monitor not waking up from
    standby, suspend, and off. This problem seems to only occur on
    Linux. I have tried Windows 10 and the Dell monitor seems to wake up
    o.k. so far. The monitor is connected through a display port.


    I would appreciate help solving this problem. I have created a
    script using the output from "*xscreensaver-command -watch*" to use
    *xrandr* to turn the screen on, but this is a bit of a band-aide
    since the screen becomes visible behind the screen saver while the
    Dell monitor is being turned back on by the script.


*Details of the problem:*

    I am using xscreensaver and have found that after I locked the
    screen and come back only my one monitor wakes up

    It was suggested that I try to replicate the issue using xset. so I
    used the command: *sleep 1; xset dpms force off*

        I tried off, standby, and suspend with xset and they all showed
        the same issue. The Dell monitor does not wake up.

        If I type "*sleep 1; xset dpms force off",* only my Samsung
        monitor wakes up. The Dell monitor briefly shows a box saying
        "_Entering energy saver mode_" and then does not wake up. If I
        type "
        *xrandr --output DP-2 --left-of DVI-D-0 --auto*" it does turn
        the monitor back on. Also, I am including the output from
        *xrandr -q* below to show the two different states for the
        monitor: after it has failed to wake and when it is operating
        normally.


*What I have tried:*

    The command *xrandr --output DP-2 --left-of DVI-D-0 --auto* will
    bring the monitor back online.

    Hardware related:

        Different DP<->DP cable
        DP<->mDP cable (cable that has mDP on the monitor side and
        standard DP port on the graphics card side)
        Connecting monitor to HDMI. When connected to the HDMI port it
        wakes fine, however HDMI only supports 30 Hz at the 3840x2160
        resolution.
        Contacted Dell but that were not interested in helping with the
        issue since it involved Linux. They say they do not support
        Linux. However, I wonder if this is really an Energy Star
        compliance issue. In any event since it works on windows it
        should be possible to make it work correctly on Linux.

    Software related:

        I have tried upgrading to the latest available kernel
        (4.10.0-27-generic) and have tried older versions but the kernel
        version did not resolve the problem.
        I have tried different versions of the NVIDIA driver but these
        also did not effect the problem. Currently running nvidia-384
        (version 384.59-0ubuntu0~gpu16.04.01).

    Windows 10:

        Monitor sleeps and wakes up normally.


    I have tried the Cinnamon window manager in addition to XFCE and
    have tried different screen savers.
    I have verified the problem directly using xset as mentioned above

*Hardware:*

    I have 2 monitors connected

     1. Dell P2715Q connected to display port
     2. Samsung monitor connected to DVI port

    Graphcis card: Asus GeForce GTX 1060

    Kernel:4.10.0-27-generic

    X.Org X Server version: 1.18.4

    Running Linux Mint

    Window manager XFCE4. I have also tried Cinnamon.

    Motherboard: Asus Maximus VIII Hero

*--------------------------------------------------------------------------------------------------------------------------------------------------------------*
*xrandr -q when the Dell monitor did not wake from sleep:*

Screen 0: minimum 8 x 8, current 1680 x 1050, maximum 32767 x 32767
DVI-D-0 connected 1680x1050+0+0 (normal left inverted right x axis y 
axis) 474mm x 296mm
    1680x1050     59.88*+  59.95
    1280x1024     75.02    60.02
    1280x960      60.00
    1152x864      75.00
    1024x768      75.03    70.07    60.00
    800x600       75.00    72.19    60.32    56.25
    640x480       75.00    72.81    59.94
HDMI-0 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 connected primary (normal left inverted right x axis y axis)
    3840x2160     60.00 +
    2560x1440     59.95
    1920x1200     59.88
    1920x1080     60.00    60.00    59.94    50.00    23.97 60.00    50.04
    1680x1050     59.95
    1600x1200     60.00
    1280x1024     75.02    60.02
    1280x800      59.81
    1280x720      60.00    59.94    50.00
    1152x864      75.00
    1024x768      75.03    60.00
    800x600       75.00    60.32
    720x576       50.00
    720x480       59.94
    640x480       75.00    59.94    59.93
DP-3 disconnected (normal left inverted right x axis y axis)

*--------------------------------------------------------------------------------------------------------------------------------------------------------------
*

*xrandr -q when both monitors are operating normally*

    Screen 0: minimum 8 x 8, current 5520 x 2160, maximum 32767 x 32767
    DVI-D-0 connected 1680x1050+3840+0 (normal left inverted right x
    axis y axis) 474mm x 296mm
        1680x1050     59.88*+  59.95
        1280x1024     75.02    60.02
        1280x960      60.00
        1152x864      75.00
        1024x768      75.03    70.07    60.00
        800x600       75.00    72.19    60.32    56.25
        640x480       75.00    72.81    59.94
    HDMI-0 disconnected (normal left inverted right x axis y axis)
    HDMI-1 disconnected (normal left inverted right x axis y axis)
    DP-0 disconnected (normal left inverted right x axis y axis)
    DP-1 disconnected (normal left inverted right x axis y axis)
    DP-2 connected primary 3840x2160+0+0 (normal left inverted right x
    axis y axis) 597mm x 336mm
        3840x2160     60.00*+
        2560x1440     59.95
        1920x1200     59.88
        1920x1080     60.00    60.00    59.94    50.00    23.97 60.00   
    50.04
        1680x1050     59.95
        1600x1200     60.00
        1280x1024     75.02    60.02
        1280x800      59.81
        1280x720      60.00    59.94    50.00
        1152x864      75.00
        1024x768      75.03    60.00
        800x600       75.00    60.32
        720x576       50.00
        720x480       59.94
        640x480       75.00    59.94    59.93
    DP-3 disconnected (normal left inverted right x axis y axis)


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