https://bugs.freedesktop.org/show_bug.cgi?id=82714

--- Comment #15 from Bruno <bonb...@sysophe.eu> ---
Created attachment 116181
  --> https://bugs.freedesktop.org/attachment.cgi?id=116181&action=edit
linux-4.0, + modprobe nouveau debug=debug runpm=0

(In reply to Pierre Moreau from comment #14)
> Could you please run `nvapeek 8841c` and post the result here please?

./envytools/nva/nvapeek 8841c
0008841c: 00000400

> If you get a non-zero value v, write value = (v & 0xffffff00) to 8841c using
> `nvapoke 8841c value` **before** loading Nouveau. nvapeek and nvapoke are
> found in the envytools repo: https://github.com/envytools/envytools

modprobe nouveau
[  747.279238] nouveau  [  DEVICE][0000:01:00.0] BOOT0  : 0x084000a2
[  747.279252] nouveau  [  DEVICE][0000:01:00.0] Chipset: G84 (NV84)
[  747.279257] nouveau  [  DEVICE][0000:01:00.0] Family : NV50
[  747.379554] nouveau  [   VBIOS][0000:01:00.0] using image from PROM
[  747.379705] nouveau  [   VBIOS][0000:01:00.0] BIT signature found
[  747.379710] nouveau  [   VBIOS][0000:01:00.0] version 60.84.32.00.00
[  747.381119] nouveau  [ DEVINIT][0000:01:00.0] adaptor not initialised
[  747.381140] nouveau  [   VBIOS][0000:01:00.0] running init tables
[  747.442531] nouveau  [     PMC][0000:01:00.0] MSI interrupts enabled
[  747.442593] nouveau  [     PFB][0000:01:00.0] RAM type: GDDR3
[  747.442597] nouveau  [     PFB][0000:01:00.0] RAM size: 512 MiB
[  747.442601] nouveau  [     PFB][0000:01:00.0]    ZCOMP: 1892 tags
[  747.445672] nouveau  [    VOLT][0000:01:00.0] GPU voltage: 1300000uv
[  747.474545] nouveau  [  PTHERM][0000:01:00.0] FAN control: PWM
[  747.474597] nouveau  [  PTHERM][0000:01:00.0] fan management: automatic
[  747.474644] nouveau  [  PTHERM][0000:01:00.0] internal sensor: yes
[  747.494680] nouveau  [     CLK][0000:01:00.0] 20: core 675 MHz shader 1450
MHz memory 1008 MHz
[  747.494743] nouveau  [     CLK][0000:01:00.0] --: core 675 MHz shader 1458
MHz memory 900 MHz
[  747.495846] nouveau E[    PBUS][0000:01:00.0] MMIO write of 0x00000000 FAULT
at 0x103d94
[  747.496017] nouveau  [     DRM] VRAM: 512 MiB
[  747.496049] nouveau  [     DRM] GART: 1048576 MiB
[  747.496067] nouveau  [     DRM] TMDS table version 2.0
[  747.496079] nouveau  [     DRM] DCB version 4.0
[  747.496096] nouveau  [     DRM] DCB outp 00: 01000302 00020030
[  747.496124] nouveau  [     DRM] DCB outp 01: 02000300 00000028
[  747.496138] nouveau  [     DRM] DCB outp 02: 04012310 00000028
[  747.496150] nouveau  [     DRM] DCB outp 03: 02021322 00020010
[  747.496161] nouveau  [     DRM] DCB conn 00: 1030
[  747.496184] nouveau  [     DRM] DCB conn 01: 2161
[  747.496202] nouveau  [     DRM] DCB conn 02: 0200
[  747.496218] nouveau  [     DRM] DCB conn 03: 0362
[  747.525704] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[  747.525721] [drm] Driver supports precise vblank timestamp query.
[  747.973933] Clocksource tsc unstable (delta = -209664716 ns)
[  749.145223] nouveau W[   PFIFO][0000:01:00.0] unknown intr 0x00200000
[  749.145653] nouveau  [     DRM] MM: using CRYPT for buffer copies
[  749.145754] Switched to clocksource hpet
[  750.783934] nouveau  [     DRM] allocated 1280x1024 fb: 0x70000, bo
ffff8800beb1b538
[  750.784312] nouveau 0000:01:00.0: fb1: nouveaufb frame buffer device
[  750.784344] [drm] Initialized nouveau 1.2.1 20120801 for 0000:01:00.0 on
minor 1

After this X11 gets stuck in runtime-PM:
[<ffffffff8158358c>] rpm_resume+0x18c/0x5c0
[<ffffffff81583a08>] __pm_runtime_resume+0x48/0x70
[<ffffffffa0090d63>] nouveau_drm_open+0x43/0x220 [nouveau]
[<ffffffff814512cd>] drm_open+0x1ad/0x4b0
[<ffffffff81457811>] drm_stub_open+0xb1/0x130
[<ffffffff811cb4a1>] chrdev_open+0xb1/0x190
[<ffffffff811c4751>] do_dentry_open.isra.19+0x101/0x330
[<ffffffff811c49f1>] vfs_open+0x41/0x50
[<ffffffff811d462b>] do_last.isra.56+0x25b/0xf20
[<ffffffff811d5379>] path_openat+0x89/0x5a0
[<ffffffff811d6c0e>] do_filp_open+0x3e/0xa0
[<ffffffff811c5f4e>] do_sys_open+0x12e/0x230
[<ffffffff811c6069>] SyS_open+0x19/0x20
[<ffffffff81879a72>] system_call_fastpath+0x12/0x17
[<ffffffffffffffff>] 0xffffffffffffffff

With runpm=0 things behave somewhat better (display lights up - tested on DVI
output where earlier tests were with VGA).

Though once X has started system gets sluggish (periods of "freeze" and
continue) until it fully freezes.

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