Warning in intel_disable_pipe with v4.1-11235-gc63f887bdea8

[Josh Boyer]

Hi All,

More i915 WARN splats.  This one on a machine with Linus' latest tree
as of this morning.

josh

[    7.906372] [drm] Replacing VGA console driver
[    7.935724] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    7.942359] [drm] Driver supports precise vblank timestamp query.
[    7.952024] vgaarb: device changed decodes:
PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
[    7.953189] e1000e 0000:00:19.0 enp0s25: renamed from eth0
[    7.995333] [drm] Initialized i915 1.6.0 20150522 for 0000:00:02.0 on minor 0
[    8.024490] fbcon: inteldrmfb (fb0) is primary device
[    8.132749] ------------[ cut here ]------------
[    8.132815] WARNING: CPU: 0 PID: 143 at
drivers/gpu/drm/i915/intel_display.c:1064
intel_disable_pipe+0x28d/0x2a0 [i915]()
[    8.132816] pipe_off wait timed out
[    8.132832] Modules linked in: i915 video i2c_algo_bit
drm_kms_helper e1000e drm ata_generic pata_acpi ptp pps_core
[    8.132837] CPU: 0 PID: 143 Comm: kworker/u8:4 Not tainted
4.2.0-0.rc0.git2.1.fc23.x86_64 #1
[    8.132839] Hardware name: Intel Corp. Intel(R) UDK2010 firmware
developer platform, BIOS SDV.TM.B10 Release Build (CSM Available)
01/01/2011
[    8.132849] Workqueue: events_unbound async_run_entry_fn
[    8.132855]  0000000000000000 000000007f346c1b ffff880134887638
ffffffff81856f03
[    8.132861]  0000000000000000 ffff880134887690 ffff880134887678
ffffffff810ab456
[    8.132866]  ffffffff81e566c0 ffff8800b3010000 0000000000070008
00000000fffb8601
[    8.132867] Call Trace:
[    8.132874]  [<ffffffff81856f03>] dump_stack+0x4c/0x65
[    8.132880]  [<ffffffff810ab456>] warn_slowpath_common+0x86/0xc0
[    8.132884]  [<ffffffff810ab4e5>] warn_slowpath_fmt+0x55/0x70
[    8.132935]  [<ffffffffa0158185>] ? gen5_read32+0x1d5/0x200 [i915]
[    8.132985]  [<ffffffffa016e07d>] intel_disable_pipe+0x28d/0x2a0 [i915]
[    8.133036]  [<ffffffffa016efd3>] ironlake_crtc_disable+0x93/0x7f0 [i915]
[    8.133087]  [<ffffffffa0183ce5>] ? intel_frontbuffer_flush+0x65/0x70 [i915]
[    8.133138]  [<ffffffffa017723e>] __intel_set_mode+0x9de/0xbc0 [i915]
[    8.133189]  [<ffffffffa017872f>] ?
intel_modeset_compute_config+0x3af/0xb60 [i915]
[    8.133241]  [<ffffffffa017e10c>] intel_crtc_set_config+0x2cc/0x610 [i915]
[    8.133263]  [<ffffffffa0039cf9>]
drm_mode_set_config_internal+0x69/0x110 [drm]
[    8.133274]  [<ffffffffa00ee6d2>] restore_fbdev_mode+0xc2/0xf0
[drm_kms_helper]
[    8.133284]  [<ffffffffa00f0579>]
drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x70 [drm_kms_helper]
[    8.133294]  [<ffffffffa00f05e2>] drm_fb_helper_set_par+0x22/0x40
[drm_kms_helper]
[    8.133345]  [<ffffffffa018d0fa>] intel_fbdev_set_par+0x1a/0x60 [i915]
[    8.133350]  [<ffffffff81494ad5>] fbcon_init+0x545/0x5d0
[    8.133355]  [<ffffffff8152ddac>] visual_init+0xbc/0x120
[    8.133359]  [<ffffffff8152fcb5>] do_bind_con_driver+0x1c5/0x3b0
[    8.133362]  [<ffffffff815301d9>] do_take_over_console+0x149/0x1a0
[    8.133366]  [<ffffffff81855c0d>] ? printk+0x55/0x6b
[    8.133370]  [<ffffffff814908e7>] do_fbcon_takeover+0x57/0xb0
[    8.133373]  [<ffffffff81495584>] fbcon_event_notify+0x674/0x770
[    8.133378]  [<ffffffff810d3b6e>] notifier_call_chain+0x3e/0xb0
[    8.133382]  [<ffffffff810d3d71>] __blocking_notifier_call_chain+0x51/0x70
[    8.133386]  [<ffffffff810d3da6>] blocking_notifier_call_chain+0x16/0x20
[    8.133389]  [<ffffffff8149b3bb>] fb_notifier_call_chain+0x1b/0x20
[    8.133392]  [<ffffffff8149d8f7>] register_framebuffer+0x217/0x350
[    8.133403]  [<ffffffffa00f0861>]
drm_fb_helper_initial_config+0x261/0x430 [drm_kms_helper]
[    8.133455]  [<ffffffffa018dbeb>] intel_fbdev_initial_config+0x1b/0x20 [i915]
[    8.133459]  [<ffffffff810d628a>] async_run_entry_fn+0x4a/0x140
[    8.133463]  [<ffffffff810cb3c2>] process_one_work+0x232/0x840
[    8.133467]  [<ffffffff810cb32b>] ? process_one_work+0x19b/0x840
[    8.133472]  [<ffffffff8112532d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[    8.133475]  [<ffffffff810cbaa5>] ? worker_thread+0xd5/0x450
[    8.133480]  [<ffffffff810cba1e>] worker_thread+0x4e/0x450
[    8.133484]  [<ffffffff810cb9d0>] ? process_one_work+0x840/0x840
[    8.133487]  [<ffffffff810d23e4>] kthread+0x104/0x120
[    8.133493]  [<ffffffff810d22e0>] ? kthread_create_on_node+0x250/0x250
[    8.133497]  [<ffffffff81860a5f>] ret_from_fork+0x3f/0x70
[    8.133500]  [<ffffffff810d22e0>] ? kthread_create_on_node+0x250/0x250
[    8.133503] ---[ end trace 94ef6cc929187b61 ]---
[    8.174594] Console: switching to colour frame buffer device 240x67
[    8.538116] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[    8.538119] i915 0000:00:02.0: registered panic notifier
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