[Bug 80122] [HSW Regression]igt/kms_flip causes "WARNING: CPU: 5 PID: 4368 at drivers/gpu/drm/i915/intel_pm.c:6174 check_power_well_state+0x69/0x6f [i915]()" sporadically

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80122

--- Comment #1 from Guo Jinxian <jinxianx.guo at intel.com> ---
DMESG shows:
[  100.529130] WARNING: CPU: 5 PID: 4368 at
drivers/gpu/drm/i915/intel_pm.c:6174 check_power_well_state+0x69/0x6f [i915]()
[  100.529131] state mismatch for 'display' (always_on 0 hw state 0 use-count 3
disable_power_well 1
[  100.529138] Modules linked in: dm_mod snd_hda_codec_realtek
snd_hda_codec_generic snd_hda_codec_hdmi iTCO_wdt iTCO_vendor_support pcspkr
serio_raw i2c_i801 firewire_ohci lpc_ich mfd_core snd_hda_intel
snd_hda_controller firewire_core crc_itu_t snd_hda_codec snd_hwdep snd_pcm
snd_timer snd soundcore battery wmi acpi_cpufreq i915 video button
drm_kms_helper drm
[  100.529140] CPU: 5 PID: 4368 Comm: kworker/u16:148 Tainted: G        W    
3.15.0-rc8_drm-intel-nightly_e9ce9f_20140617+ #3634
[  100.529140] Hardware name:                  /DZ87KLT75K, BIOS
KLZ8711D.86A.0336.2013.0516.1957 05/16/2013
[  100.529143] Workqueue: events_unbound async_run_entry_fn
[  100.529144]  0000000000000000 0000000000000009 ffffffff81772bca
ffff880255dafc68
[  100.529145]  ffffffff81036e54 0000000000000286 ffffffffa0069e8b
ffff88025661c000
[  100.529146]  ffffffffa00fe338 ffffffffa00fe338 0000000000000001
0000000000800000
[  100.529147] Call Trace:
[  100.529150]  [<ffffffff81772bca>] ? dump_stack+0x41/0x51
[  100.529153]  [<ffffffff81036e54>] ? warn_slowpath_common+0x78/0x90
[  100.529156]  [<ffffffffa0069e8b>] ? check_power_well_state+0x69/0x6f [i915]
[  100.529158]  [<ffffffff81036f04>] ? warn_slowpath_fmt+0x45/0x4a
[  100.529162]  [<ffffffffa0069e8b>] ? check_power_well_state+0x69/0x6f [i915]
[  100.529166]  [<ffffffffa006df31>] ? intel_display_power_get+0x82/0xb9 [i915]
[  100.529173]  [<ffffffffa00aad1c>] ? intel_display_set_init_power+0x22/0x34
[i915]
[  100.529177]  [<ffffffffa006ddff>] ? intel_power_domains_init_hw+0x21/0x6b
[i915]
[  100.529180]  [<ffffffffa0064607>] ? i915_resume_early+0x3d/0x3d [i915]
[  100.529183]  [<ffffffffa0064135>] ? i915_drm_thaw_early+0x40/0x46 [i915]
[  100.529186]  [<ffffffff813d129b>] ? dpm_run_callback+0x30/0x6b
[  100.529187]  [<ffffffff813d1950>] ? device_resume_early+0x130/0x172
[  100.529189]  [<ffffffff813d1b78>] ? async_resume_early+0x14/0x38
[  100.529189]  [<ffffffff81053d9f>] ? async_run_entry_fn+0x55/0x10b
[  100.529192]  [<ffffffff8104aade>] ? process_one_work+0x1e2/0x363
[  100.529193]  [<ffffffff8104b385>] ? worker_thread+0x1c7/0x2bc
[  100.529194]  [<ffffffff8104b1be>] ? manage_workers.isra.23+0x1b5/0x1b5
[  100.529196]  [<ffffffff8104fb32>] ? kthread+0xc5/0xcd
[  100.529197]  [<ffffffff8104fa6d>] ? kthread_freezable_should_stop+0x40/0x40
[  100.529199]  [<ffffffff8177e9bc>] ? ret_from_fork+0x7c/0xb0
[  100.529200]  [<ffffffff8104fa6d>] ? kthread_freezable_should_stop+0x40/0x40

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