[Nouveau] [Bug 91954] New: "link training failed": nouveau does not recover from monitor suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91954

            Bug ID: 91954
           Summary: "link training failed": nouveau does not recover from
                    monitor suspend
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: djc at djc.id.au
        QA Contact: xorg-team at lists.x.org

When my monitor wakes up from "power save mode" (DPMS suspend) nouveau does not
display any output and the monitor goes back to power save after a few seconds.
The kernel says:

kernel: nouveau E[   PDISP][0000:03:00.0][0x00000006] 02:0006:0f42: link
training failed

The behaviour of the monitor might be a bit dodgy. When booting the machine I
have to mash buttons on the monitor to keep it awake until the firmware starts
displaying an image, otherwise I will get no output from the firmware at all.

When the monitor goes into power save mode, it stays awake showing a message
"Power save mode" for about 3 seconds, then it actually powers down (its LED
turns orange). I have noticed that nouveau can recover if I shake the mouse
during those three seconds, but it can't recover if I let the monitor power all
the way down.

Complete logs to follow.

Hardware:
Lenovo Thinkstation P500, all legacy/CSM features disabled ("pure UEFI")
Nvidia Quadro K620 (GM107/NV117)
Thinkvision 2840m connected via Displayport

Software:
xorg-x11-server-Xorg-1.17.2-2.fc22.x86_64
xorg-x11-drv-nouveau-1.0.11-2.fc22.x86_64
Kernel is 4.2.0 plus Fedora patches plus these four commits suggested by Ben
Skeggs:
http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?h=linux-4.3&id=7c11c99b3c66a8e03494e56ce6e6c5303ee85934
http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?h=linux-4.3&id=f10956d4455fcb24ecbdca30e6d9d88c95dc2588
http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?h=linux-4.3&id=fe0f5d08806dcf7fd51092dfc6ea666ea2392692
http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?h=linux-4.3&id=2a89359415da2fc1250b4c205de3c384bd781f54

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