[Bug 88934] New: [ILK]unplug DP will cause dmesg error.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88934

            Bug ID: 88934
           Summary: [ILK]unplug DP will cause dmesg error.
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: hengx.ding at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

==System Environment==
--------------------------
Regression:  yes
will bisect later.

no-working platforms: ILK

==kernel==
--------------------------
drm-intel-testing/e0f77e2aeee065f8530ef87a9842fee5e89ea681

==Bug detailed description==
-----------------------------
start with eDP, and plug/unplug DP monitor will cause dmesg error.
[  241.744627] WARNING: CPU: 1 PID: 3717 at drivers/gpu/drm/drm_irq.c:1129
drm_wait_one_vblank+0x35/0x141 [drm]()
[  241.744831] Modules linked in: snd_hda_codec_hdmi snd_hda_codec_idt
snd_hda_codec_generic firewire_ohci i2c_i801 snd_hda_intel snd_hda_controller
snd_hda_codec snd_hwdep lpc_ich mfd_core firewire_core crc_itu_t snd_pcm
snd_timer bcma snd soundcore dm_mod parport_pc parport tpm_tis tpm wmi battery
ac acpi_cpufreq joydev i915 button video drm_kms_helper drm cfbfillrect
cfbimgblt cfbcopyarea
[  241.745620] CPU: 1 PID: 3717 Comm: kworker/1:3 Tainted: G        W     
3.19.0-rc6_drm-intel-testing_e0f77e_20150131_+ #150
[  241.746755]  [<f811b4ba>] ? drm_wait_one_vblank+0x35/0x141 [drm]
[  241.746973]  [<f811b4ba>] drm_wait_one_vblank+0x35/0x141 [drm]
[  241.748353]  [<f812ce6d>] ? kfree_state+0x42/0x45 [drm]
[  241.748626]  [<f812051b>] ? drm_mode_plane_set_obj_prop+0x47/0x5a [drm]
[  241.748691]  [<f81212a7>] drm_mode_set_config_internal+0x47/0xb2 [drm]
[  241.748804]  [<f80f66ab>] restore_fbdev_mode+0xa5/0xc4 [drm_kms_helper]
[  241.748927]  [<f80f77b5>]
drm_fb_helper_restore_fbdev_mode_unlocked+0x1f/0x4c [drm_kms_helper]
[  241.749079]  [<f80f7812>] drm_fb_helper_set_par+0x30/0x34 [drm_kms_helper]
[  241.749207]  [<f80f778d>] drm_fb_helper_hotplug_event+0x92/0x9b
[drm_kms_helper]
[  241.756648]  [<f80ef979>] drm_kms_helper_hotplug_event+0x21/0x24
[drm_kms_helper]


==Reproduce steps==
---------------------------- 
1. start with eDP
2. Plug DP monior.
3. Unplyg DP monitor.
4. Check dmesg.

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