[Bug 80376] [SNB/BDW Regression]igt/kms_flip/vblank-vs-modeset-suspend causes "WARNING: CPU: 2 PID: 1051 at drivers/gpu/drm/i915/i915_irq.c:267 intel_gen6_powersave_work+0xa49/0xf1e [i915]()"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80376

--- Comment #4 from liulei <lei.a.liu at intel.com> ---
basing on latest testing (ac710a93740e609759fa75dacdc96f1dfc34b5c5), I found
this Call Trace
[ 2431.640836] ---[ end trace 214e6bb4fbf3a91a ]---
[ 2431.640849] ------------[ cut here ]------------
[ 2431.640863] WARNING: CPU: 5 PID: 4182 at drivers/gpu/drm/i915/i915_irq.c:423
ibx_display_interrupt_update+0x52/0x7d [i915]()
[ 2431.640872] Modules linked in: dm_mod iTCO_wdt iTCO_vendor_support
snd_hda_codec_hdmi dcdbas snd_hda_codec_realtek snd_hda_codec_generic serio_raw
pcspkr i2c_i801 snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep
snd_pcm ppdev snd_timer lpc_ich mfd_core snd soundcore tpm_tis parport_pc tpm
parport acpi_cpufreq i915 video button drm_kms_helper drm
[ 2431.640874] CPU: 5 PID: 4182 Comm: kworker/u16:24 Tainted: G        W    
3.15.0-rc8_drm-intel-testing_ac710a_20140621_+ #60
[ 2431.640874] Hardware name: Dell Inc. OptiPlex 990/0DXWW6, BIOS A02
02/26/2011
[ 2431.640876] Workqueue: events_unbound async_run_entry_fn
[ 2431.640879]  00000046 00000000 f0a25d88 c176d89d 00000000 f0a25da0 c1032878
f81ffeb8
[ 2431.640881]  c2c28000 00010000 00010000 f0a25db0 c10328a3 00000009 00000000
f0a25dc4
[ 2431.640883]  f81ffeb8 c2c28000 00000000 f532c800 f0a25de8 f82015be 00000000
00000282
[ 2431.640884] Call Trace:
[ 2431.640885]  [<c176d89d>] dump_stack+0x41/0x52
[ 2431.640886]  [<c1032878>] warn_slowpath_common+0x66/0x7d
[ 2431.640898]  [<f81ffeb8>] ? ibx_display_interrupt_update+0x52/0x7d [i915]
[ 2431.640899]  [<c10328a3>] warn_slowpath_null+0x14/0x18
[ 2431.640909]  [<f81ffeb8>] ibx_display_interrupt_update+0x52/0x7d [i915]
[ 2431.640920]  [<f82015be>] intel_set_pch_fifo_underrun_reporting+0xd2/0x131
[i915]
[ 2431.640934]  [<f821e9de>] ironlake_crtc_disable+0x83/0x73b [i915]
[ 2431.640944]  [<f80a87c0>] ? drm_modeset_lock_all_crtcs+0x28/0x40 [drm]
[ 2431.640952]  [<f81db255>] i915_drm_freeze+0xbb/0x13d [i915]
[ 2431.640961]  [<f81db365>] i915_pm_suspend+0x42/0x47 [i915]
[ 2431.640963]  [<c132aae4>] pci_pm_suspend+0x75/0xe7
[ 2431.640964]  [<c132aa6f>] ? pci_pm_freeze+0x94/0x94
[ 2431.640966]  [<c13b0624>] dpm_run_callback+0x2a/0x5f
[ 2431.640967]  [<c13b1191>] __device_suspend+0x19f/0x212
[ 2431.640968]  [<c13b1220>] async_suspend+0x1c/0x78
[ 2431.640970]  [<c104f008>] async_run_entry_fn+0x5d/0xfd
[ 2431.640972]  [<c1045b95>] process_one_work+0x21c/0x3d4
[ 2431.640973]  [<c1046283>] ? worker_thread+0x2d/0x285
[ 2431.640974]  [<c10463f7>] worker_thread+0x1a1/0x285
[ 2431.640976]  [<c1046256>] ? manage_workers.isra.23+0x199/0x199
[ 2431.640977]  [<c104a952>] kthread+0xa4/0xa9
[ 2431.640978]  [<c1773a0e>] ? _raw_spin_unlock_irq+0x27/0x2b
[ 2431.640980]  [<c1060000>] ? prio_changed_rt+0x20/0x4e
[ 2431.640982]  [<c1779d61>] ret_from_kernel_thread+0x21/0x30
[ 2431.640983]  [<c104a8ae>] ? __init_kthread_worker+0x47/0x47
[ 2431.640984] ---[ end trace 214e6bb4fbf3a91b ]---

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