[ASUS X556UR] Can't use Nvidia gpu after Suspend/Wake

Submitted by RazorSiS

Assigned to Nouveau Project

Link to original bug (#102648)

Description

Created attachment 134145
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

Attachment 134145, "dmesg with the problem before and after suspend":
kernel.log