linux v4.4.0 nouveau fails

[Wakko Warner]

When booting 4.4.0 on one of my systems, when nouveau loads, the screen goes
into powersave.  It doesn't appear to register the fb0 device.
When X starts up, the screen comes back and I'm able to login.  When
launching anything that accesses 3D, the screen freezes.  Nothing is logged
in either X or dmesg.

This same system works with 4.2.6.  I understand that the version in 4.3 was
a rewrite.

System: Gigabyte EP45-DS3R, NVIDIA Quadro FX 3500 (10de:029d subsys
10de:032b)
This system boots over the network with the onboard RTL nic.
NOTE: Syslinux 4.04 fails to boot this kernel, but will boot 4.2.x just
fine.  System was booted with grub built for pxe boot.
According to X log, the chipset is NV49.  Xorg log available on request.

dmesg relevent to nouveau
[    8.051990] nouveau 0000:01:00.0: NVIDIA G71 (049d00a2)
[    8.248756] nouveau 0000:01:00.0: bios: version 05.71.22.29.06
[    8.249189] nouveau 0000:01:00.0: fb: 256 MiB GDDR3
[    8.304586] [TTM] Zone  kernel: Available graphics memory: 4085044 kiB
[    8.304627] [TTM] Zone   dma32: Available graphics memory: 2097152 kiB
[    8.304664] [TTM] Initializing pool allocator
[    8.304704] [TTM] Initializing DMA pool allocator
[    8.304753] nouveau 0000:01:00.0: DRM: VRAM: 250 MiB
[    8.304789] nouveau 0000:01:00.0: DRM: GART: 512 MiB
[    8.304828] nouveau 0000:01:00.0: DRM: TMDS table version 1.1
[    8.304865] nouveau 0000:01:00.0: DRM: TMDS table script pointers not stubbed
[    8.304903] nouveau 0000:01:00.0: DRM: DCB version 3.0
[    8.304940] nouveau 0000:01:00.0: DRM: DCB outp 00: 01000300 00000028
[    8.304979] nouveau 0000:01:00.0: DRM: DCB outp 01: 03000302 00000000
[    8.305016] nouveau 0000:01:00.0: DRM: DCB outp 02: 04011310 00000028
[    8.305054] nouveau 0000:01:00.0: DRM: DCB outp 03: 0c011312 00000000
[    8.305092] nouveau 0000:01:00.0: DRM: DCB conn 00: 1030
[    8.305129] nouveau 0000:01:00.0: DRM: DCB conn 01: 2130
[    8.305165] nouveau 0000:01:00.0: DRM: DCB conn 02: 0260
[    8.305337] nouveau 0000:01:00.0: DRM: Saving VGA fonts
[    8.343959] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    8.343996] [drm] Driver supports precise vblank timestamp query.
[    8.344053] nouveau 0000:01:00.0: DRM: 0xBDF8: Parsing digital output script table
[    8.393709] nouveau 0000:01:00.0: DRM: 0xBE3A: Parsing digital output script table
[    8.444646] nouveau 0000:01:00.0: DRM: MM: using M2MF for buffer copies
[    8.444689] [drm] Initialized nouveau 1.3.1 20120801 for 0000:01:00.0 on minor 0
<after X starts>
[ 1011.109534] nouveau 0000:01:00.0: DRM: 0xBDF8: Parsing digital output script table


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