[Nouveau] [Bug 108022] New: Cannot resume from standby - Link training fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108022

            Bug ID: 108022
           Summary: Cannot resume from standby - Link training fails
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: barry at grussling.com
        QA Contact: xorg-team at lists.x.org

Created attachment 141689
  --> https://bugs.freedesktop.org/attachment.cgi?id=141689&action=edit
DMESG with nvkm_dp_train_pattern failure.  At 3468 is the manual re-plug

My computer (X10DAX motherboard, Nvidia GTX 980, dual Xeon E5) fails to come
back if it goes to DPMS standby with:
WARNING: CPU: 3 PID: 8 at drivers/gpu/drm/nouveau/include/nvkm/subdev/i2c.h:170
nvkm_dp_train_pattern+0x12e/0x150 [nouveau]

I am running 4.18.9 of the kernel.

The GTX 980s are hooked to dual Dell P2715Q monitors.  The monitors have a
steady glowing power LED until I attempt to resume by moving the mouse at which
point they say not connected and the power led starts flashing.

If I remove the re-insert the DP cable(s) the monitors come back.

Note that I am doing no suspending nor hibernation.

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