I tried 3.7-rc5 on an ironlale PC and got the warning in subject. The computer last ran 3.6.0 without any warnings. Second reboot showed the same warning plus a couple of EDID warnings (also below).
Still there with 3.7.0-rc7-00113-gcc19528 and 100% reproducible:
[ 0.646574] WARNING: at drivers/gpu/drm/i915/intel_display.c:1009 ironlake_crtc_disable+0xaf/0x8e0() [ 0.646575] Hardware name: HP Compaq 8100 Elite SFF PC [ 0.646575] pipe_off wait timed out [ 0.646576] Modules linked in: [ 0.646578] Pid: 1, comm: swapper/0 Not tainted 3.7.0-rc7-00113-gcc19528 #75 [ 0.646578] Call Trace: [ 0.646583] [<ffffffff81036899>] ? warn_slowpath_common+0x79/0xc0 [ 0.646584] [<ffffffff81036995>] ? warn_slowpath_fmt+0x45/0x50 [ 0.646585] [<ffffffff812b5ceb>] ? intel_wait_for_pipe_off+0x5b/0x170 [ 0.646586] [<ffffffff812b669f>] ? ironlake_crtc_disable+0xaf/0x8e0 [ 0.646588] [<ffffffff812c5ac9>] ? intel_dp_mode_fixup+0x249/0x270 [ 0.646590] [<ffffffff812bd4c6>] ? intel_set_mode+0x306/0x920 [ 0.646592] [<ffffffff812be1d1>] ? intel_crtc_set_config+0x6f1/0x950 [ 0.646595] [<ffffffff8127545f>] ? drm_fb_helper_set_par+0x6f/0xe0 [ 0.646598] [<ffffffff8120c7bf>] ? fbcon_init+0x55f/0x5f0 [ 0.646600] [<ffffffff8125af8c>] ? visual_init+0xac/0x110 [ 0.646601] [<ffffffff8125c7ec>] ? bind_con_driver+0x16c/0x340 [ 0.646602] [<ffffffff8125ca20>] ? take_over_console+0x60/0x70 [ 0.646604] [<ffffffff8120ab6b>] ? fbcon_takeover+0x5b/0xc0 [ 0.646607] [<ffffffff81059375>] ? notifier_call_chain+0x45/0x60 [ 0.646608] [<ffffffff81059555>] ? __blocking_notifier_call_chain+0x55/0x80 [ 0.646609] [<ffffffff8120415f>] ? register_framebuffer+0x1af/0x2e0 [ 0.646611] [<ffffffff812756c4>] ? drm_fb_helper_single_fb_probe+0x1f4/0x320 [ 0.646612] [<ffffffff81275999>] ? drm_fb_helper_initial_config+0x1a9/0x220 [ 0.646615] [<ffffffff810dd13d>] ? __kmalloc+0xed/0x130 [ 0.646618] [<ffffffff812d6ead>] ? intel_fbdev_init+0x7d/0xb0 [ 0.646619] [<ffffffff81298e55>] ? i915_driver_load+0xd95/0xf00 [ 0.646622] [<ffffffff81283fa5>] ? drm_get_pci_dev+0x185/0x2c0 [ 0.646624] [<ffffffff811f3d41>] ? pci_device_probe+0xd1/0x170 [ 0.646625] [<ffffffff812e9ed8>] ? driver_probe_device+0x68/0x220 [ 0.646626] [<ffffffff812ea123>] ? __driver_attach+0x93/0xa0 [ 0.646627] [<ffffffff812ea090>] ? driver_probe_device+0x220/0x220 [ 0.646629] [<ffffffff812e836d>] ? bus_for_each_dev+0x4d/0x80 [ 0.646630] [<ffffffff812e9648>] ? bus_add_driver+0x178/0x260 [ 0.646631] [<ffffffff812ea724>] ? driver_register+0x84/0x180 [ 0.646634] [<ffffffff8188c7c4>] ? drm_core_init+0x12f/0x12f [ 0.646636] [<ffffffff810002e2>] ? do_one_initcall+0x122/0x170 [ 0.646638] [<ffffffff8142c6bc>] ? kernel_init+0x11c/0x2a0 [ 0.646641] [<ffffffff8186c54a>] ? do_early_param+0x83/0x83 [ 0.646643] [<ffffffff8105e761>] ? schedule_tail+0x21/0xb0 [ 0.646644] [<ffffffff8142c5a0>] ? rest_init+0x70/0x70 [ 0.646645] [<ffffffff814455ac>] ? ret_from_fork+0x7c/0xb0 [ 0.646646] [<ffffffff8142c5a0>] ? rest_init+0x70/0x70 [ 0.646650] ---[ end trace ed6fe7a7042b42d8 ]--- [ 0.702400] [drm:intel_disable_transcoder] *ERROR* failed to disable transcoder 0