[Bug 85791] New: nouveau: errors on boot, can't use discrete gpu

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=85791

            Bug ID: 85791
           Summary: nouveau: errors on boot, can't use discrete gpu
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.16.4, 3.14.20
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: mezin.alexander at gmail.com
        Regression: No

Created attachment 152791
  --> https://bugzilla.kernel.org/attachment.cgi?id=152791&action=edit
dmesg

On boot I see these errors:

[   18.929898] nouveau E[    PBUS][0000:01:00.0] MMIO write of 0x00000002 FAULT
at 0x4188ac [ IBUS ]
[   18.931250] nouveau E[     DRM] Pointer to TMDS table invalid
[   18.932395] nouveau E[     DRM] Pointer to flat panel table invalid
[   22.798349] nouveau E[  PGRAPH][0000:01:00.0] HUB_INIT timed out
[   22.798360] nouveau E[  PGRAPH][0000:01:00.0] 409000 - done 0x00000220
[   22.798373] nouveau E[  PGRAPH][0000:01:00.0] 409000 - stat 0x00000000
0x00000000 0x00000000 0x00000000
[   22.798384] nouveau E[  PGRAPH][0000:01:00.0] 409000 - stat 0x00000000
0x00000000 0x00000006 0x00000001
[   22.798389] nouveau E[  PGRAPH][0000:01:00.0] 502000 - done 0x00000300
[   22.798397] nouveau E[  PGRAPH][0000:01:00.0] 502000 - stat 0x00000000
0x00008c00 0x00000000 0x00000000
[   22.798404] nouveau E[  PGRAPH][0000:01:00.0] 502000 - stat 0x00000000
0x00000000 0x00000000 0x00000000
[   22.798406] nouveau E[  PGRAPH][0000:01:00.0] init failed, -16

Full dmesg is attached.

When I try to use discrete gpu with DRI_PRIME=1 (after xrandr
--setprovideroffloadsink), X crashes.

Hardware:
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated
Graphics Controller (rev 09)
01:00.0 3D controller: NVIDIA Corporation GK107M [GeForce GT 750M] (rev a1)

Acer Aspire V5-573G

If I remember correctly, some time ago everything worked.

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