[Nouveau] nouveau preventing shutdown after suspend-resume

[João Paulo Rechi Vita]

Hello,

I'm working on a Asus X756UQK laptop with nvidia + intel graphics
cards. After a suspend-resume cycle, the machine hangs on shutdown,
requiring a forced power off. After resuming I sometimes see the
following messages on the kernel log:

    [  186.117539] nouveau 0000:01:00.0: DRM: evicting buffers...
    [  186.118105] nouveau 0000:01:00.0: DRM: waiting for kernel
channels to go idle...
    [  201.139049] nouveau 0000:01:00.0: DRM: failed to idle channel 0 [DRM]
    [  201.139688] ------------[ cut here ]------------
    [  201.140297] WARNING: CPU: 0 PID: 1230 at
/usr/src/packages/BUILD/linux-4.8.0/drivers/pci/pci.c:1616
pci_disable_device+0x99/0xb0
    [  201.140970] nouveau 0000:01:00.0: disabling already-disabled device
    [  201.140984] Modules linked in:
    [  201.141608]  ccm arc4 rfcomm joydev cmac bnep intel_rapl
x86_pkg_temp_thermal coretemp i2c_designware_platform
i2c_designware_core kvm_intel asus_nb_wmi asus_wmi sparse_keymap
snd_hda_codec_hdmi snd_hda_codec_conexant snd_soc_skl
snd_hda_codec_generic snd_soc_skl_ipc snd_soc_sst_ipc kvm ath10k_pci
snd_soc_sst_dsp snd_hda_ext_core snd_soc_sst_match ath10k_core
snd_soc_core irqbypass crct10dif_pclmul snd_compress crc32_pclmul
ac97_bus ghash_clmulni_intel snd_pcm_dmaengine ath mac80211
snd_hda_intel aesni_intel snd_hda_codec aes_x86_64 snd_hda_core lrw
glue_helper uvcvideo snd_hwdep ablk_helper videobuf2_vmalloc cryptd
videobuf2_memops snd_pcm videobuf2_v4l2 cfg80211 videobuf2_core
videodev snd_timer media input_leds snd r8169 soundcore mii btusb
btrtl shpchp processor_thermal_device mei_me idma64 mei
    [  201.143087]  intel_pch_thermal
    [  201.143087]  virt_dma
    [  201.143087]  intel_lpss_pci
    [  201.143088]  intel_soc_dts_iosf
    [  201.143088]  hci_uart
    [  201.143089]  elan_i2c
    [  201.143089]  btbcm
    [  201.143089]  btqca
    [  201.143090]  btintel
    [  201.143090]  bluetooth
    [  201.143090]  int3403_thermal
    [  201.143091]  int340x_thermal_zone
    [  201.143091]  acpi_als
    [  201.143091]  kfifo_buf
    [  201.143092]  int3400_thermal
    [  201.143092]  acpi_thermal_rel
    [  201.143093]  industrialio
    [  201.143093]  intel_lpss_acpi
    [  201.143093]  acpi_pad
    [  201.143094]  tpm_crb
    [  201.143094]  intel_lpss
    [  201.143094]  fjes
    [  201.143095]  mac_hid
    [  201.143095]  asus_wireless
    [  201.143095]  nouveau
    [  201.143096]  i915
    [  201.143096]  mxm_wmi
    [  201.143096]  i2c_algo_bit
    [  201.143097]  drm_kms_helper
    [  201.143097]  syscopyarea
    [  201.143098]  ttm
    [  201.143098]  sysfillrect
    [  201.143098]  serio_raw
    [  201.143099]  sysimgblt
    [  201.143099]  fb_sys_fops
    [  201.143100]  drm
    [  201.143100]  ahci
    [  201.143100]  libahci
    [  201.143101]  i2c_hid
    [  201.143101]  hid
    [  201.143101]  video
    [  201.143102]  wmi

    [  201.143104] CPU: 0 PID: 1230 Comm: kworker/0:6 Not tainted
4.8.0-32-generic #34+dev155.82734c4beos3.1.2-Endless
    [  201.143104] Hardware name: ASUSTeK COMPUTER INC.
X756UQK/X756UQK, BIOS X756UQK.201 07/01/2016
    [  201.143107] Workqueue: pm pm_runtime_work
    [  201.143110]  0000000000000286 000000006307316f ffff953a9d933c08
ffffffff9e031233
    [  201.143111]  ffff953a9d933c58 0000000000000000 ffff953a9d933c48
ffffffff9dc832f1
    [  201.143112]  0000065000000000 ffff953a9ff44000 ffff953a9feeeca0
ffff953a997b1800
    [  201.143113] Call Trace:
    [  201.143116]  [<ffffffff9e031233>] dump_stack+0x63/0x90
    [  201.143118]  [<ffffffff9dc832f1>] __warn+0xd1/0xf0
    [  201.143120]  [<ffffffff9dc8336f>] warn_slowpath_fmt+0x5f/0x80
    [  201.143122]  [<ffffffff9e0924b4>] ? pci_save_vc_state+0x34/0xe0
    [  201.143124]  [<ffffffff9e087b99>] pci_disable_device+0x99/0xb0
    [  201.143152]  [<ffffffffc06d63d9>]
nouveau_pmops_runtime_suspend+0x69/0xe0 [nouveau]
    [  201.143153]  [<ffffffff9e08a03b>] pci_pm_runtime_suspend+0x5b/0x180
    [  201.143154]  [<ffffffff9e1abf63>] __rpm_callback+0x33/0x70
    [  201.143155]  [<ffffffff9e1abfc4>] rpm_callback+0x24/0x80
    [  201.143156]  [<ffffffff9e089fe0>] ? pci_pm_runtime_resume+0xa0/0xa0
    [  201.143157]  [<ffffffff9e1ac2dd>] rpm_suspend+0x12d/0x650
    [  201.143158]  [<ffffffff9e1adc48>] pm_runtime_work+0x78/0xa0
    [  201.143160]  [<ffffffff9dc9db16>] process_one_work+0x156/0x420
    [  201.143161]  [<ffffffff9dc9e62e>] worker_thread+0x4e/0x4a0
    [  201.143162]  [<ffffffff9dc9e5e0>] ? rescuer_thread+0x380/0x380
    [  201.143163]  [<ffffffff9dc9e5e0>] ? rescuer_thread+0x380/0x380
    [  201.143165]  [<ffffffff9dca3b38>] kthread+0xd8/0xf0
    [  201.143167]  [<ffffffff9e49f3df>] ret_from_fork+0x1f/0x40
    [  201.143168]  [<ffffffff9dca3a60>] ? kthread_park+0x60/0x60
    [  201.143169] ---[ end trace db73394a87e603e4 ]---

Disabling runtime pm (nouveau.runpm=0) the machine is able to
shutdown, but with a delay of ~30s, and the following messages on the
log:

nouveau 0000:01:00.0: Xorg[691]: failed to idle channel 2 [Xorg[691]]
nouveau 0000:01:00.0: Xorg[691]: failed to idle channel 2 [Xorg[691]]

lspci shows the card as:
01:00.0 3D controller: NVIDIA Corporation Device 179c (rev a2)

And according to nouveau logs, this card supports the Optimus technology:

[    0.863470] pci 0000:01:00.0: optimus capabilities: enabled, status
dynamic power, hda bios codec supported
[    0.863472] VGA switcheroo: detected Optimus DSM method
\_SB_.PCI0.RP01.PEGP handle
[    0.863473] nouveau: detected PR support, will not use DSM
[    0.863494] nouveau 0000:01:00.0: enabling device (0006 -> 0007)
[    0.863691] nouveau 0000:01:00.0: NVIDIA GM107 (1171c0a2)

Is this a known problem? I couldn't find any similar reports. Right
now we are shipping a DMI-based quirk to disable rpm as a work-around,
but I would like to support finding a real solution. I'm happy to file
a bugzilla entry and provide any other needed information or help with
testing. Are nouveau bugs tracked on bugs.kernel.org or the fdo
bugzilla?

Thanks and regards,

--
João Paulo Rechi Vita
http://about.me/jprvita