[Bug 90237] [SKL desktop] "testdisplay -a" causes Call Trace

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90237

--- Comment #4 from wendy.wang at intel.com ---
Test on SKL Mobile with eywa-4.1-2015-06-22

reproduce steps:
1. boot up system with eywa-4.1-2015-06-22
2. echo 7 > /proc/sys/kernel/printk
3. echo disk > /sys/power/state
4. wait for a while observed call trace in dmesg.


[ 4246.629377] ------------[ cut here ]------------
[ 4246.629390] WARNING: CPU: 0 PID: 1452 at
drivers/gpu/drm/i915/intel_display.c:12791 check_crtc_state+0x821/0xfb0
[i915]()
[ 4246.629390] pipe state doesn't match!
[ 4246.629404] Modules linked in: snd_hda_codec_hdmi snd_hda_codec_realtek
snd_hda_codec_generic hid_generic asix usbnet mii usbhid xhci_plat_hcd i915
drm_kms_helper drm i2c_algo_bit snd_hda_intel dwc3 udc_core 8250_dw
i2c_designware_platform i2c_designware_core snd_hda_codec snd_hda_core
snd_hwdep intel_rapl iosf_mbi snd_pcm x86_pkg_temp_thermal coretemp kvm_intel
snd_seq_midi snd_seq_midi_event kvm snd_rawmidi crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel snd_seq aesni_intel aes_x86_64 snd_seq_device lrw gf128mul
glue_helper ablk_helper iwlwifi cryptd snd_timer snd cfg80211 psmouse serio_raw
soundcore rfcomm idma64 mei_me virt_dma bnep bluetooth xhci_pci mei xhci_hcd
dwc3_pci intel_lpss_pci wmi i2c_hid hid i2c_core winbond_cir rc_core video
pinctrl_sunrisepoint pinctrl_intel spidev intel_lpss_acpi intel_lpss parport_pc
acpi_pad ppdev mac_hid lp nls_iso8859_1 parport e1000e sdhci_pci ptp sdhci
mmc_core pps_core ahci libahci
[ 4246.629409] CPU: 0 PID: 1452 Comm: kworker/0:0 Tainted: G        W      
4.1.0-eywa-4.1-2015-06-22-mod+ #12
[ 4246.629409] Hardware name: Intel Corporation Skylake Client platform/Skylake
Y LPDDR3 RVP3, BIOS SKLSE2R1.R00.B088.B00.1506091425 06/09/2015
[ 4246.629411] Workqueue: events console_callback
[ 4246.629412]  ffffffffa0755f18 ffff88016a84f568 ffffffff8175fd99
000000005e8e5e8e
[ 4246.629413]  ffff88016a84f5b8 ffff88016a84f5a8 ffffffff810780fa
ffff88016a84f5b0
[ 4246.629414]  ffff880080bc7400 ffff88016ac37000 ffff880036b12000
0000000000000001
[ 4246.629414] Call Trace:
[ 4246.629416]  [<ffffffff8175fd99>] dump_stack+0x45/0x57
[ 4246.629418]  [<ffffffff810780fa>] warn_slowpath_common+0x8a/0xc0
[ 4246.629419]  [<ffffffff81078176>] warn_slowpath_fmt+0x46/0x50
[ 4246.629431]  [<ffffffffa06a2e91>] check_crtc_state+0x821/0xfb0 [i915]
[ 4246.629446]  [<ffffffffa06cba89>] intel_modeset_check_state+0x2c9/0xb80
[i915]
[ 4246.629458]  [<ffffffffa06c2264>] ? __intel_set_mode+0x4f4/0x870 [i915]
[ 4246.629470]  [<ffffffffa06c307b>] ? intel_modeset_compute_config+0xcb/0xf00
[i915]
[ 4246.629483]  [<ffffffffa06cc74a>] intel_crtc_set_config+0x40a/0x5a0 [i915]
[ 4246.629494]  [<ffffffffa059114f>] drm_mode_set_config_internal+0x6f/0x110
[drm]
[ 4246.629499]  [<ffffffffa0607e60>] drm_fb_helper_pan_display+0xa0/0xf0
[drm_kms_helper]
[ 4246.629512]  [<ffffffffa06e5a4a>] intel_fbdev_pan_display+0x1a/0x60 [i915]
[ 4246.629513]  [<ffffffff81418903>] ? bit_cursor+0x633/0x670
[ 4246.629515]  [<ffffffff8141de21>] fb_pan_display+0xd1/0x1a0
[ 4246.629516]  [<ffffffff81418110>] bit_update_start+0x20/0x50
[ 4246.629517]  [<ffffffff81416932>] fbcon_switch+0x3a2/0x550
[ 4246.629519]  [<ffffffff814ab759>] redraw_screen+0x189/0x240
[ 4246.629520]  [<ffffffff8141508a>] fbcon_blank+0x20a/0x2d0
[ 4246.629522]  [<ffffffff814c7cf3>] ? _xfer_secondary_pool+0xb3/0x170
[ 4246.629523]  [<ffffffff810b04f2>] ? dequeue_entity+0x152/0x6c0
[ 4246.629524]  [<ffffffff810e226e>] ? internal_add_timer+0x8e/0xb0
[ 4246.629526]  [<ffffffff810e444a>] ? mod_timer+0x12a/0x1e0
[ 4246.629528]  [<ffffffff814ac2c8>] do_unblank_screen+0xb8/0x1f0
[ 4246.629529]  [<ffffffff814ad66f>] poke_blanked_console+0xcf/0xe0
[ 4246.629529]  [<ffffffff814ad7bf>] console_callback+0x13f/0x160
[ 4246.629531]  [<ffffffff81763057>] ? __schedule+0x357/0x960
[ 4246.629532]  [<ffffffff810918cf>] process_one_work+0x14f/0x420
[ 4246.629533]  [<ffffffff81092088>] worker_thread+0x118/0x530
[ 4246.629535]  [<ffffffff81091f70>] ? rescuer_thread+0x3d0/0x3d0
[ 4246.629536]  [<ffffffff81097612>] kthread+0xd2/0xf0
[ 4246.629538]  [<ffffffff81097540>] ? kthread_create_on_node+0x180/0x180
[ 4246.629540]  [<ffffffff81767d62>] ret_from_fork+0x42/0x70
[ 4246.629541]  [<ffffffff81097540>] ? kthread_create_on_node+0x180/0x180
[ 4246.629542] ---[ end trace 2aaa9aff1abb737e ]---

dmesg_s4_calltrace.log attached.

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