[Bug 93768] [BAT SKL DMC] GPU death starting with first symptom: WARNING backtrace: "DC6 already programmed to be enabled."

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93768

--- Comment #10 from Igor Zinovyev <zinigor+freedesktop at gmail.com> ---
I seem to be affected by this bug as well, here is the kern.log snippet:

 [  537.187920] ------------[ cut here ]------------
 [  537.187949] WARNING: CPU: 2 PID: 5 at
drivers/gpu/drm/i915/intel_runtime_pm.c:686 skl_enable_dc6+0xb5/0

 [  537.187949] DC6 already programmed to be enabled.
 [  537.187950] Modules linked in: ipt_MASQUERADE nf_nat_masquerade_ipv4
iptable_nat nf_nat_ipv4 nf_nat tun
 bnep i2c_designware_platform i2c_designware_core dell_wmi dell_rbtn
dell_laptop dm_crypt snd_hda_codec_hdm
p_thermal dell_smbios intel_powerclamp dcdbas coretemp crct10dif_pclmul
crc32_pclmul snd_hda_codec_realtek 
codec_generic aesni_intel aes_x86_64 crypto_simd glue_helper cryptd joydev
snd_usb_audio snd_usb_toneport s
o_raw snd_usb_line6 snd_hda_codec snd_hwdep snd_seq_midi snd_seq_midi_event
snd_hda_core snd_rawmidi snd_se
ds uvcvideo videobuf2_vmalloc snd_seq_device iwlmvm videobuf2_memops snd_timer
videobuf2_v4l2 usblp videobu

 [  537.187970]  videodev mac80211 snd media soundcore rtsx_pci_ms btusb
memstick btrtl idma64 iwlwifi mei_
ss_pci processor_thermal_device shpchp intel_soc_dts_iosf hci_uart btbcm btqca
btintel int3403_thermal blue
i intel_lpss int3402_thermal int3400_thermal int340x_thermal_zone mac_hid
acpi_pad acpi_thermal_rel intel_h
rqfd irqbypass vfio_iommu_type1 vfio pci_stub parport_pc ppdev lp parport
autofs4 rtsx_pci_sdmmc mmc_core n
ttm psmouse i2c_algo_bit drm_kms_helper firewire_ohci firewire_core syscopyarea
sysfillrect crc_itu_t sysim
tsx_pci drm i2c_hid wmi pinctrl_sunrisepoint pinctrl_intel
 [  537.187993] CPU: 2 PID: 5 Comm: kworker/u16:0 Tainted: G        W      
4.11.3 #36
 [  537.187993] Hardware name: Dell Inc. Precision 5510/08R8KJ, BIOS 1.2.13
08/08/2016
 [  537.188007] Workqueue: i915-dp i915_digport_work_func [i915]
 [  537.188008] Call Trace:
 [  537.188010]  dump_stack+0x4d/0x66
 [  537.188012]  __warn+0xc6/0xe0
 [  537.188013]  warn_slowpath_fmt+0x55/0x80
 [  537.188025]  ? fwtable_read32+0x9c/0x1c0 [i915]
 [  537.188034]  ? skl_set_power_well+0x143/0x5e0 [i915]
 [  537.188043]  skl_enable_dc6+0xb5/0xc0 [i915]
 [  537.188051]  gen9_dc_off_power_well_disable+0x2b/0x30 [i915]
 [  537.188059]  intel_power_well_disable+0x39/0x40 [i915]
 [  537.188068]  intel_display_power_put+0xcf/0x140 [i915]
 [  537.188080]  intel_dp_hpd_pulse+0x146/0x2f0 [i915]
 [  537.188092]  i915_digport_work_func+0x88/0x100 [i915]
 [  537.188094]  process_one_work+0x1ec/0x480
 [  537.188095]  worker_thread+0x43/0x4d0
 [  537.188096]  kthread+0x103/0x140
 [  537.188097]  ? process_one_work+0x480/0x480
 [  537.188098]  ? kthread_create_on_node+0x60/0x60
 [  537.188099]  ret_from_fork+0x29/0x40
 [  537.188100] ---[ end trace 612d405cb24a9eda ]---


I'm running Linux 4.11.3 on Ubuntu 17.04, 
I have a Dell Precision m5510 with an Intel GPU on the 915 chipset:

00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics P530
[8086:191d] (rev 06)
        DeviceName:  Onboard IGD
        Subsystem: Dell HD Graphics P530 [1028:06e5]
        Kernel driver in use: i915
        Kernel modules: i915
01:00.0 3D controller [0302]: NVIDIA Corporation GM107GLM [Quadro M1000M]
[10de:13b1] (rev a2)
        Subsystem: Dell GM107GLM [Quadro M1000M] [1028:06e5]
        Kernel driver in use: nouveau
        Kernel modules: nvidiafb, nouveau

I'm using graphics drivers from Padoka PPA, the current versions are
libdrm-intel1:amd64 2.4.81+git1706051541.16444e1~z~padoka0
*mesa* 1:17.2~git170605162900.4b1e6ed~z~padoka0
libwayland* 1.13.0+git201705130017.0eefe99~z~padoka0

Please let me know if you need any more info from me. I'm happy to do a bisect
if I can find a way to reproduce that error. Usually it happens when I leave
the laptop sitting idle. After that I can't even REISUB, it's going completely
unresponsive.

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