[Nouveau] [Bug 102648] New: unable to use nvidia gpu after suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102648

            Bug ID: 102648
           Summary: unable to use nvidia gpu after suspend
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: razorsis100 at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 134145
  --> https://bugs.freedesktop.org/attachment.cgi?id=134145&action=edit
dmesg with the problem before and after suspend

Os: Arch X86_64 Updated regularly
System : Notebook Asus X556UR

Tried with bumblebee nvidia:
Works perefectly after boot
but after a suspend/wake optirun output: Failed to initialize secondary GPU

only way to make it work again is: 
reboot or pci bus remove/rescan(doesn't work sometimes)

So I consulted with Lekensteyn and did numerous testings
checked nvidia card powermanagement, parent bus power mangement
PM is on for both but it just doesn't work after suspend/wake

switched to nouveau (removed bumblebee nvidia)
tested with lspci, no errors after boot
but after suspend/wake: DRM: failed to idle channel 0 [DRM]

So he suggested to file a bug for nouveau with kernel log and acpidump

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