*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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