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Date:	Mon, 30 Jun 2014 17:05:03 +0200
From:	Paul Bolle <>
To:	Daniel Vetter <>,
	Jani Nikula <>,
	David Airlie <>
Subject: drm: i915: "plane B assertion failure, should be off on pipe B but
 is still active"

Kernels v3.16-rc2 and v3.16-rc3 trigger a new (for me) warning. (I never
booted v3.16-rc1). Machine is a, rather outdated, ThinkPad X41 (ie,
single core i686).

WARNING: CPU: 0 PID: 221 at drivers/gpu/drm/i915/intel_display.c:1274 assert_planes_disabled+0xf9/0x100 [i915]()
plane B assertion failure, should be off on pipe B but is still active
Modules linked in: tg3 i915(+) i2c_algo_bit drm_kms_helper ptp drm ata_generic pata_acpi yenta_socket i2c_core pps_core video
CPU: 0 PID: 221 Comm: systemd-udevd Not tainted 3.16.0-0.rc3.1.local0.fc20.i686 #1
Hardware name: IBM 2525FAG/2525FAG, BIOS 74ET64WW (2.09 ) 12/14/2006
 c0c87907 add7c490 00000000 f652b9ac c09fdab7 f652b9ec f652b9dc c045008e
 f830c6cc f652ba0c 000000dd f830c634 000004fa f82b4d59 f82b4d59 f6728000
 00000001 f65a8c00 f652b9f8 c04500ee 00000009 f652b9ec f830c6cc f652ba0c
Call Trace:
 [<c09fdab7>] dump_stack+0x41/0x52
 [<c045008e>] warn_slowpath_common+0x7e/0xa0
 [<f82b4d59>] ? assert_planes_disabled+0xf9/0x100 [i915]
 [<f82b4d59>] ? assert_planes_disabled+0xf9/0x100 [i915]
 [<c04500ee>] warn_slowpath_fmt+0x3e/0x60
 [<f82b4d59>] assert_planes_disabled+0xf9/0x100 [i915]
 [<f82bd8d6>] intel_disable_pipe+0x26/0xb0 [i915]
 [<f82aec40>] ? gen4_read8+0xc0/0xc0 [i915]
 [<f82c25d3>] i9xx_crtc_disable+0x93/0x3d0 [i915]
 [<f82c91bc>] intel_modeset_setup_hw_state+0x7ac/0xbc0 [i915]
 [<f82aec40>] ? gen4_read8+0xc0/0xc0 [i915]
 [<f815bc7c>] ? drm_modeset_lock_all_crtcs+0x3c/0x50 [drm]
 [<f82c9d04>] intel_modeset_init+0x734/0x1220 [i915]
 [<f82a2edb>] ? i915_enable_pipestat+0xab/0x120 [i915]
 [<f82a34c4>] ? i915_irq_postinstall+0x104/0x110 [i915]
 [<f8146ba9>] ? drm_irq_install+0xa9/0x170 [drm]
 [<f82f4016>] i915_driver_load+0xa76/0xe70 [i915]
 [<f82f13d0>] ? i915_switcheroo_set_state+0x90/0x90 [i915]
 [<c06b5880>] ? cleanup_uevent_env+0x10/0x10
 [<c05d8243>] ? sysfs_add_file+0x23/0x30
 [<c07a4034>] ? get_device+0x14/0x30
 [<c07a8e52>] ? klist_class_dev_get+0x12/0x20
 [<c09f73ce>] ? klist_node_init+0x2e/0x50
 [<c09f7487>] ? klist_add_tail+0x27/0x30
 [<c07a5506>] ? device_add+0x1d6/0x5a0
 [<f814ca8a>] ? drm_sysfs_device_add+0xba/0x100 [drm]
 [<f81496ee>] drm_dev_register+0x8e/0xe0 [drm]
 [<f814bca9>] drm_get_pci_dev+0x79/0x1c0 [drm]
 [<f8274415>] i915_pci_probe+0x35/0x60 [i915]
 [<c06f0baf>] pci_device_probe+0x6f/0xc0
 [<c05d8625>] ? sysfs_create_link+0x25/0x40
 [<c07a8093>] driver_probe_device+0x93/0x3a0
 [<c05d8357>] ? sysfs_create_dir_ns+0x37/0x80
 [<c06f0af1>] ? pci_match_device+0xc1/0xe0
 [<c07a8451>] __driver_attach+0x71/0x80
 [<c07a83e0>] ? __device_attach+0x40/0x40
 [<c07a64c7>] bus_for_each_dev+0x57/0xa0
 [<c07a7bbe>] driver_attach+0x1e/0x20
 [<c07a83e0>] ? __device_attach+0x40/0x40
 [<c07a7807>] bus_add_driver+0x157/0x230
 [<f7fc8000>] ? 0xf7fc7fff
 [<f7fc8000>] ? 0xf7fc7fff
 [<c07a8b39>] driver_register+0x59/0xe0
 [<c0564f56>] ? __kmalloc_track_caller+0x46/0x1f0
 [<c06ef722>] __pci_register_driver+0x32/0x40
 [<f814bed5>] drm_pci_init+0xe5/0x110 [drm]
 [<f7fc8000>] ? 0xf7fc7fff
 [<f7fc8088>] i915_init+0x88/0x8a [i915]
 [<f7fc8000>] ? 0xf7fc7fff
 [<c0400492>] do_one_initcall+0xc2/0x1f0
 [<f7fc8000>] ? 0xf7fc7fff
 [<c05624dd>] ? kfree+0xdd/0x120
 [<c05524ef>] ? __vunmap+0x8f/0xe0
 [<c05524ef>] ? __vunmap+0x8f/0xe0
 [<c05524ef>] ? __vunmap+0x8f/0xe0
 [<c04bee92>] load_module+0x1a92/0x23b0
 [<c04bbd69>] ? copy_module_from_fd.isra.46+0x109/0x1a0
 [<c04bf94d>] SyS_finit_module+0x8d/0xd0
 [<c0538f43>] ? vm_mmap_pgoff+0x93/0xb0
 [<c0a045df>] sysenter_do_call+0x12/0x16

Feel free to prod me for further details.

Paul Bolle

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