Hi, Some update related to this warning. Ironlake_crtc_dpms() will enable/disable crtc which pipe was enabled/disabled there. Ironlake_crtc_dpms(DRM_MODE_DPMS_OFF) was called before the warning and crtc was disabled, that causes intel_wait_for_vblank() timeout and some assertions. I think it's a bug but I have no clue where/when to enable crtc again. Here's part of dmesg before the warning and the message showing dpms off. [ 19.332220] [drm:intel_lvds_init], LVDS is not present in VBT [ 19.332261] [drm:intel_crt_init], pch crt adpa set to 0x80f40000 [ 19.332295] [drm:intel_dp_i2c_init], i2c_init DPDDC-B [ 19.334807] [drm:intel_dp_aux_ch], dp_aux_ch timeout status 0x5145003f [ 19.334809] [drm:intel_dp_i2c_aux_ch], aux_ch failed -110 [ 19.337318] [drm:intel_dp_aux_ch], dp_aux_ch timeout status 0x5145003f [ 19.337319] [drm:intel_dp_i2c_aux_ch], aux_ch failed -110 [ 19.337432] [drm:ironlake_crtc_dpms], crtc 0/0 dpms off [ 19.337436] [drm:i915_get_vblank_timestamp], crtc 0 is disabled [ 19.351826] ------------[ cut here ]------------ [ 19.351848] WARNING: at drivers/gpu/drm/i915/intel_display.c:1118 assert_fdi_tx+0x87/0x90 [i915]() [ 19.351849] Hardware name: Shark Bay Client platform [ 19.351850] FDI TX state assertion failure (expected off, current on) [ 19.351867] Modules linked in: i915(+) kvm snd_hda_codec_realtek snd_hda_codec_hdmi drm_kms_helper drm snd_hda_intel snd_hda_codec snd_hwdep snd_pcm ghash_clmulni_intel snd_seq_midi snd_rawmidi snd_s eq_midi_event snd_seq aesni_intel snd_timer i2c_algo_bit cryptd mcs7830 psmouse snd_seq_device usbnet snd joydev aes_x86_64 hid_generic soundcore serio_raw snd_page_alloc lpc_ich microcode mac_hid video lp parport e1000e usbhid hid [ 19.351869] Pid: 535, comm: modprobe Not tainted 3.5.0-rc46patches+ #29 [ 19.351870] Call Trace: [ 19.351876] [<ffffffff8105278f>] warn_slowpath_common+0x7f/0xc0 thanks --xingchao > -----Original Message----- > From: Wang, Xingchao > Sent: Tuesday, August 07, 2012 3:26 PM > To: Daniel Vetter; Zanoni, Paulo R > Cc: intel-gfx at lists.freedesktop.org; Fu, Michael; Wu, Fengguang; 'Zhenyu > Wang (zhenyuw at linux.intel.com)'; Zhao, Yakui > Subject: assertion on intel_disable_transcoder > > Hi Daniel/Paulo, > > It's easy to see such WARNING in dmesg, the DDI port is not disabled prior to > disable transcoder. > I am not sure it will impact the Pipe/transcoder/DDI-port configurations, > anyway after some times WARNING, I could not make HDMI audio work > anymore. > With intel_audio_dump I could see the related configurations was totally > disabled. > > DDI_BUF_CTL_A 0x00000080 DDI Buffer Controler A > DDI_BUF_CTL_B 0x00000000 DDI Buffer Controler B > DDI_BUF_CTL_C 0x00000080 DDI Buffer Controler C > DDI_BUF_CTL_D 0x00000000 DDI Buffer Controler D > DDI_BUF_CTL_E 0x80000002 DDI Buffer Controler E > PIPE_CONF_A 0x00000000 PIPE Configuration A > PIPE_CONF_B 0x00000000 PIPE Configuration B > PIPE_CONF_C 0x00000000 PIPE Configuration C > PIPE_CONF_EDP 0x00000000 PIPE Configuration EDP > PIPE_DDI_FUNC_CTL_A 0xc4034002 PIPE DDI Function Control A > PIPE_DDI_FUNC_CTL_B 0xa0035000 PIPE DDI Function Control B > PIPE_DDI_FUNC_CTL_C 0x00030000 PIPE DDI Function Control C > PIPE_DDI_FUNC_CTL_EDP 0x00030000 PIPE DDI Function Control EDP > TRANS_CONF 0x00000000 Transcoder Configuration > > Thanks > --xingchao > > [ 16.835658] ------------[ cut here ]------------ > [ 16.835690] WARNING: at drivers/gpu/drm/i915/intel_display.c:1118 > assert_fdi_tx+0x87/0x90 [i915]() > [ 16.835691] Hardware name: Shark Bay Client platform > [ 16.835692] FDI TX state assertion failure (expected off, current on) > [ 16.835706] Modules linked in: snd_seq_midi_event i915(+) snd_seq > snd_timer drm_kms_helper snd_seq > _device ghash_clmulni_intel drm aesni_intel snd cryptd mcs7830 usbnet joydev > aes_x86_64 soundcore psm ouse snd_page_alloc hid_generic i2c_algo_bit > serio_raw video mac_hid microcode lpc_ich lp parport e10 00e usbhid hid > [ 16.835708] Pid: 470, comm: modprobe Not tainted 3.5.0-rc46patches+ #12 > [ 16.835709] Call Trace: > [ 16.835715] [<ffffffff8105278f>] warn_slowpath_common+0x7f/0xc0 > [ 16.835718] [<ffffffff81052886>] warn_slowpath_fmt+0x46/0x50 > [ 16.835728] [<ffffffffa01cc847>] assert_fdi_tx+0x87/0x90 [i915] > [ 16.835739] [<ffffffffa01d5cf5>] ironlake_crtc_disable+0x185/0x820 [i915] > [ 16.835748] [<ffffffffa01d641e>] ironlake_crtc_dpms+0x8e/0xa0 [i915] > [ 16.835756] [<ffffffffa01cdbd8>] intel_crtc_dpms+0x48/0x140 [i915] > [ 16.835768] [<ffffffffa01d49d5>] intel_crtc_disable+0x35/0xb0 [i915] > [ 16.835772] [<ffffffffa012d6a5>] > drm_helper_disable_unused_functions+0x115/0x190 [drm_kms_helper] > [ 16.835785] [<ffffffffa01d849d>] intel_modeset_init+0x8ad/0xf90 [i915] > [ 16.835796] [<ffffffffa01aebba>] i915_driver_load+0xa8a/0xb90 [i915] > [ 16.835812] [<ffffffffa016fa7b>] ? drm_get_minor+0x26b/0x310 [drm] > [ 16.835819] [<ffffffffa0171e71>] drm_get_pci_dev+0x191/0x2b0 [drm] > [ 16.835834] [<ffffffffa01fc01b>] i915_pci_probe+0x4f/0x57 [i915] > [ 16.835837] [<ffffffff8134230c>] local_pci_probe+0x5c/0xd0 > [ 16.835840] [<ffffffff81343c49>] pci_device_probe+0x109/0x130 > [ 16.835843] [<ffffffff814065ee>] driver_probe_device+0x7e/0x220 > [ 16.835845] [<ffffffff8140683b>] __driver_attach+0xab/0xb0 > [ 16.835848] [<ffffffff81406790>] ? driver_probe_device+0x220/0x220 > [ 16.835850] [<ffffffff81404a26>] bus_for_each_dev+0x56/0x90 > [ 16.835852] [<ffffffff8140610e>] driver_attach+0x1e/0x20 > [ 16.835854] [<ffffffff81405cc0>] bus_add_driver+0x1a0/0x270 > [ 16.835856] [<ffffffff81406d96>] driver_register+0x76/0x130 > [ 16.835859] [<ffffffff81343916>] __pci_register_driver+0x56/0xd0 > [ 16.835862] [<ffffffff8166949d>] ? notifier_call_chain+0x4d/0x70 > [ 16.835869] [<ffffffffa01720aa>] drm_pci_init+0x11a/0x130 [drm] > [ 16.835871] [<ffffffffa0230000>] ? 0xffffffffa022ffff > [ 16.835880] [<ffffffffa0230066>] i915_init+0x66/0x68 [i915] > [ 16.835884] [<ffffffff8100203f>] do_one_initcall+0x3f/0x170 > [ 16.835887] [<ffffffff810b581e>] sys_init_module+0xbe/0x230 > [ 16.835890] [<ffffffff8166d769>] system_call_fastpath+0x16/0x1b > [ 16.835891] ---[ end trace bd9532eaee4e4542 ]---
