NV34 / 4.2.5-201.fc22.i686

dmesg:
[   24.812240] nouveau  [  DEVICE][0000:01:00.0] Chipset: NV34 (NV34)
[   24.812249] nouveau  [  DEVICE][0000:01:00.0] Family : NV30
...
[  178.486096] ACPI: Waking up from system sleep state S4
...
[  355.012379] nouveau E[   PFIFO][0000:01:00.0] DMA_PUSHER - ch 1 [Xorg[517]]
get 0x0003c528 put 0x00025618 state 0xc000fa40 (err: MEM_FAULT) push 0x00000000
[  355.012391] nouveau W[   PFIFO][0000:01:00.0] unknown intr 0x00010000
[  608.759016] nouveau E[Xorg[517]] failed to idle channel 0xcccc0001
[Xorg[517]]
[  638.934015] nouveau E[Xorg[517]] failed to idle channel 0xcccc0001
[Xorg[517]]
[  669.024015] nouveau E[Xorg[517]] failed to idle channel 0xcccc0000
[Xorg[517]]
[  699.220016] nouveau E[Xorg[517]] failed to idle channel 0xcccc0000
[Xorg[517]]
[  715.214259] nouveau  [     DRM] 0xDBBA: Parsing digital output script table
[  719.981109] nouveau E[  PGRAPH][0000:01:00.0]  (unknown bits 0x00000080)
nsource: nstatus:
[  719.981129] nouveau E[  PGRAPH][0000:01:00.0] ch 1 [Xorg[1579]] subc 0 class
0x0039 mthd 0x0100 data 0x00000000
[  830.456017] nouveau E[Xorg[1579]] failed to idle channel 0xcccc0001
[Xorg[1579]]
[  860.514016] nouveau E[Xorg[1579]] failed to idle channel 0xcccc0001
[Xorg[1579]]
[  891.004014] nouveau E[Xorg[1579]] failed to idle channel 0xcccc0000
[Xorg[1579]]
[  902.422408] nouveau  [     DRM] 0xDB7C: Parsing digital output script table
[  902.518808] nouveau E[     DRM] GPU lockup - switching to software fbcon
[  921.324016] nouveau E[Xorg[1579]] failed to idle channel 0xcccc0000
[Xorg[1579]]
[  952.652018] nouveau E[Xorg[1579]] failed to idle channel 0xcccc0000
[Xorg[1579]]
[  982.702016] nouveau E[Xorg[1579]] failed to idle channel 0xcccc0000
[Xorg[1579]]