[Nouveau] [Bug 94725] New: Nouveau driver fails to load on GM204

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94725

            Bug ID: 94725
           Summary: Nouveau driver fails to load on GM204
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: rashed at linux.com
        QA Contact: xorg-team at lists.x.org

Created attachment 122587
  --> https://bugs.freedesktop.org/attachment.cgi?id=122587&action=edit
dmesg from boot

Booting Linux 4.6-rc1 and Mesa 11.2/11.3 fails to load the nouveau driver on a
GTX 970M (6GB) on an MSI GS60 Ghost Pro 4K (i7-6700HQ). It spews out wonderful
messages like
[    2.146398] nouveau 0000:01:00.0: priv: HUB0: 10ecc0 ffffffff (1940822c)
[    2.154362] vga_switcheroo: enabled
[    2.154567] [TTM] Zone  kernel: Available graphics memory: 8170764 kiB
[    2.154568] [TTM] Zone   dma32: Available graphics memory: 2097152 kiB
[    2.154569] [TTM] Initializing pool allocator
[    2.154572] [TTM] Initializing DMA pool allocator
[    2.154577] nouveau 0000:01:00.0: DRM: VRAM: 6144 MiB
[    2.154578] nouveau 0000:01:00.0: DRM: GART: 1048576 MiB
[    2.154580] nouveau 0000:01:00.0: DRM: Pointer to TMDS table invalid
[    2.154582] nouveau 0000:01:00.0: DRM: DCB version 4.1
[    2.154583] nouveau 0000:01:00.0: DRM: Pointer to flat panel table invalid

Attached is a dmesg from boot. The driver does just drop to the i915 driver so
the machine is usable, but whenever I run lspci or lshw or try to logout of the
X session, it hangs when it switches back to the nVidia GPU (the laptop has an
LED indicator showing which GPU is in use)

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