Primary monitor is not seen by Xorg after resume from Standby
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
My system is running a fresh install of Stretch (AMD64). My issue is
that my primary monitor does not wake up (logs show the monitor as
disconnected) after the system resumes from suspend-to-RAM. I am using
GNOME as my DE but I was able to reproduce the issue in KDE and
Cinnamon. I am using an Nvidia GTX1070 GPU with the proprietary
nvidia-drivers (375.66) package. Unfortunately, the nouveau drivers do
not even allow me to resume from suspend-to-RAM. I can resolve the
issue by logging out of my user session. As soon as I get back to GDM,
both monitors work. Logging back into the same user account restores
the Acer as the primary display.
I am using two monitors - the primary is an Acer XB271HU (2560x1440,
144Hz, IPS, G-Sync) and the secondary is a Dell U2713HM (2560x1440, 60
Hz, IPS). After resuming from standby, only the Dell monitor is used.
Both monitors are connected via DisplayPort. The Acer is shown on DFP-
2 and the Dell on DFP-4. While both monitors are connected via DP, the
Acer uses 4 lanes @ 5.4Gbps while the Dell uses 4 lanes @ 2.7 Gbps,
presumably due to the higher refresh rate on the Acer.
Given that the issue persists with 3 different DEs, I suspect the
problem is either a bug with the Nvidia drivers or a configuration
issue, but I'm not sure what to do next. The Xorg log indicates no
seemingly relevant errors. However, both the Xorg log and xrandr show
the Acer monitor as disconnected after resuming from suspend.
For example, where it would previously show:
[ 99312.524] (--) NVIDIA(GPU-0): Acer XB271HU (DFP-2): connected
[ 99312.524] (--) NVIDIA(GPU-0): Acer XB271HU (DFP-2): Internal
DisplayPort
[ 99312.524] (--) NVIDIA(GPU-0): Acer XB271HU (DFP-2): 1440.0 MHz
maximum pixel clock
After suspending to RAM, I see:
[ 66519.291] (--) NVIDIA(GPU-0): DFP-2: disconnected
[ 66519.291] (--) NVIDIA(GPU-0): DFP-2: Internal DisplayPort
[ 66519.291] (--) NVIDIA(GPU-0): DFP-2: 1440.0 MHz maximum pixel clock
When the Acer monitor is working, xrandr shows the following output:
DP-0 connected primary 2560x1440+0+0 (normal left inverted right x axis
y axis) 598mm x 336mm
2560x1440 59.95 + 144.00* 120.00 99.95 84.98 23.97
1024x768 60.00
800x600 60.32
640x480 59.94
I thought the issue might be the higher refresh rate so I tried
reducing the Acer to 60 Hz but that didn't resolve the issue.
Disabling G-Sync in the Nvidia control panel doesn't seem to have any
impact as the monitor still displays G-Sync mode (variable refresh rate
depending on content), and there is no way to turn this mode off from
the monitor. I am able to toggle G-Sync on/off in Windows, so there's
nothing wrong with the monitor.
Here is relevant log output after resuming from suspend-to-RAM: https:
//pastebin.com/9zLCA76B
Thanks in advance for the assistance,
Jason
-----BEGIN PGP SIGNATURE-----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=yQqv
-----END PGP SIGNATURE-----
Reply to: