Linux bo 4.0.0-trunk-amd64 #1 SMP Debian 4.0-1~exp1 (2015-04-21) x86_64
GNU/Linux

bo@bo:~$ dmesg | grep nouve
[   12.510157] nouveau 0000:01:00.0: enabling device (0006 -> 0007)
[   12.510320] nouveau  [  DEVICE][0000:01:00.0] BOOT0  : 0x0e70d0a2
[   12.510321] nouveau  [  DEVICE][0000:01:00.0] Chipset: GK107 (NVE7)
[   12.510322] nouveau  [  DEVICE][0000:01:00.0] Family : NVE0
[   12.519025] nouveau  [   VBIOS][0000:01:00.0] using image from ACPI
[   12.519108] nouveau  [   VBIOS][0000:01:00.0] BIT signature found
[   12.519110] nouveau  [   VBIOS][0000:01:00.0] version 80.07.a8.00.0f
[   12.519398] nouveau  [ DEVINIT][0000:01:00.0] adaptor not initialised
[   12.519425] nouveau  [   VBIOS][0000:01:00.0] running init tables
[   12.675786] nouveau  [     PMC][0000:01:00.0] MSI interrupts enabled
[   12.675835] nouveau  [     PFB][0000:01:00.0] RAM type: GDDR5
[   12.675836] nouveau  [     PFB][0000:01:00.0] RAM size: 2048 MiB
[   12.675837] nouveau  [     PFB][0000:01:00.0]    ZCOMP: 0 tags
[   12.675898] nouveau E[    PBUS][0000:01:00.0] MMIO write of 0x00000002 FAULT
at 0x4188ac [ IBUS ]
[   12.677860] nouveau  [    VOLT][0000:01:00.0] GPU voltage: 600000uv
[   12.727255] nouveau  [  PTHERM][0000:01:00.0] FAN control: none / external
[   12.727270] nouveau  [  PTHERM][0000:01:00.0] fan management: automatic
[   12.727295] nouveau  [  PTHERM][0000:01:00.0] internal sensor: yes
[   12.727363] nouveau  [     CLK][0000:01:00.0] 07: core 405 MHz memory 810
MHz 
[   12.727421] nouveau  [     CLK][0000:01:00.0] 0a: core 405-1097 MHz memory
1600 MHz 
[   12.727496] nouveau  [     CLK][0000:01:00.0] 0f: core 405-1097 MHz memory
5400 MHz 
[   12.727633] nouveau  [     CLK][0000:01:00.0] --: core 405 MHz memory 810
MHz 
[   12.760239] nouveau E[    PBUS][0000:01:00.0] MMIO read of 0x00000000 FAULT
at 0x500c30 [ IBUS ]
[   12.760408] nouveau  [     DRM] VRAM: 2048 MiB
[   12.760409] nouveau  [     DRM] GART: 1048576 MiB
[   12.760421] nouveau E[     DRM] Pointer to TMDS table invalid
[   12.760470] nouveau  [     DRM] DCB version 4.0
[   12.760471] nouveau E[     DRM] Pointer to flat panel table invalid
[   12.766380] nouveau  [     DRM] MM: using COPY for buffer copies
[   12.766385] [drm] Initialized nouveau 1.2.1 20120801 for 0000:01:00.0 on
minor 0
[   31.531758] nouveau E[    PBUS][0000:01:00.0] MMIO write of 0x00000002 FAULT
at 0x4188ac [ IBUS ]
[   32.184387] nouveau E[    PBUS][0000:01:00.0] MMIO write of 0x00000000 FAULT
at 0x418880 [ IBUS ]
[   32.184479] nouveau E[   PIBUS][0000:01:00.0] GPC0: 0x419eb4 0xbadf1000
(0x3800820c)
[   32.184553] nouveau E[    PBUS][0000:01:00.0] MMIO write of 0x00000000 FAULT
at 0x405804 [ IBUS ]
[   32.184968] nouveau E[   PIBUS][0000:01:00.0] HUB0: 0x404170 0x00000012
(0x0e008201)
[   34.186577] nouveau E[     PGR][0000:01:00.0] HUB_INIT timed out
[   34.186588] nouveau E[     PGR][0000:01:00.0] 409000 - done 0x00000204
[   34.186600] nouveau E[     PGR][0000:01:00.0] 409000 - stat 0x00000000
0x00000000 0x00000000 0x00000000
[   34.186611] nouveau E[     PGR][0000:01:00.0] 409000 - stat 0x00000000
0x00000000 0x00000002 0x00000009
[   34.186617] nouveau E[     PGR][0000:01:00.0] 502000 - done 0x00000300
[   34.186624] nouveau E[     PGR][0000:01:00.0] 502000 - stat 0x00000000
0x00000000 0x00000000 0x00000000
[   34.186631] nouveau E[     PGR][0000:01:00.0] 502000 - stat 0x00000000
0x00000000 0x00000000 0x00000000
[   34.186634] nouveau E[     PGR][0000:01:00.0] init failed, -16
[16430.044081] nouveau E[    PBUS][0000:01:00.0] MMIO write of 0x00000002 FAULT
at 0x4188ac [ IBUS ]

Is there something that users can do to help with fixing this ? :)