After add drm.debug, and correct my original video settings to "video=HDMI-A-1:1280x720@60", the messages are listed below: [ 4.001953] [drm:omap_drm_init], init [ 4.005279] [drm:pdev_probe], omapdrm [ 4.005279] [drm:drm_platform_init], [ 4.013763] [drm:drm_get_platform_dev], [ 4.013763] [drm:drm_get_minor], [ 4.022521] [drm:drm_get_minor], new minor assigned 64 [ 4.022521] [drm:drm_get_minor], [ 4.032073] [drm:drm_get_minor], new minor assigned 0 [ 4.037445] [drm:dev_load], load: dev=ef184800 [ 4.042358] [drm:omap_encoder_init], lcd [ 4.046630] [drm:omap_encoder_init], tv [ 4.050750] [drm:omap_encoder_init], lcd2 [ 4.055023] [drm:omap_connector_init], hdmi [ 4.055023] [drm:drm_sysfs_connector_add], adding "HDMI-A-1" to sysfs [ 4.066650] [drm:drm_sysfs_hotplug_event], generating hotplug event [ 4.073486] [drm:omap_connector_init], dvi [ 4.077362] [drm:drm_sysfs_connector_add], adding "DVI-D-1" to sysfs [ 4.084869] [drm:drm_sysfs_hotplug_event], generating hotplug event [ 4.092376] Not enabling generic panel as no connector is detected [ 4.097442] [drm:omap_connector_init], dvi: failed to enable: 1 [ 4.105163] [drm:omap_connector_destroy], dvi [ 4.109771] [drm:drm_sysfs_connector_remove], removing "DVI-D-1" from sysfs [ 4.118286] omapdrm omapdrm.0: could not create connector [ 4.124023] [drm:create_crtc], disconnecting gfx from tv [ 4.124023] [drm:omap_connector_attached_encoder], hdmi: found tv [ 4.134582] [drm:create_crtc], connecting gfx to tv [ 4.139190] [drm:omap_crtc_init], gfx [ 4.144744] [drm:omap_modeset_init], lcd: possible_crtcs=00000000 [ 4.151550] [drm:omap_modeset_init], tv: possible_crtcs=00000001 [ 4.157897] [drm:omap_modeset_init], lcd2: possible_crtcs=00000000 [ 4.159393] [drm:dump_video_chains], dumping video chains: [ 4.166931] [drm:dump_video_chains], 0: gfx -> tv -> hdmi [ 4.175994] [drm:dump_video_chains], 1: vid1 -> tv -> hdmi [ 4.175994] [drm:dump_video_chains], 2: vid2 -> tv -> hdmi [ 4.187561] [drm:omap_encoder_dpms], lcd: 3 [ 4.191986] [drm:omap_encoder_dpms], tv: 3 [ 4.196319] [drm:omap_encoder_dpms], lcd2: 3 [ 4.196319] [drm:omap_crtc_dpms], gfx: 3 [ 4.204956] [drm:commit], gfx [ 4.204956] [drm:commit], 0x0 -> 0x0 (0) [ 4.210754] [drm:commit], 0,0 (null) 00000000 [ 4.217010] [drm:drm_fb_helper_parse_command_line], cmdline mode for connector HDMI-A-1 1280x720@60Hz [ 4.226776] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:6:HDMI-A-1] [ 4.232452] [drm:omap_connector_get_modes], hdmi [ 4.239013] [drm:omap_connector_native_mode], native mode from preferred: 1360x768@60 [ 4.239624] [drm:omap_connector_scaler_modes_add], adding scaler mode: 1280x720@60 [ 4.255889] [drm:omap_connector_scaler_modes_add], adding scaler mode: 1152x768@60 [ 4.260864] [drm:omap_connector_scaler_modes_add], adding scaler mode: 1024x768@60 [ 4.268829] [drm:omap_connector_scaler_modes_add], adding scaler mode: 800x600@60 [ 4.279785] [drm:omap_connector_scaler_modes_add], adding scaler mode: 720x480@59 [ 4.287689] [drm:omap_connector_scaler_modes_add], adding scaler mode: 640x480@59 [ 4.287689] [drm:omap_connector_mode_valid], connector: mode invalid: 20:"640x480" 59 23500 640 688 720 800 480 483 487 494 0x40 0x9 [ 4.308197] [drm:omap_connector_mode_valid], connector: mode invalid: 19:"720x480" 59 26000 720 768 800 880 480 483 493 499 0x40 0x9 [ 4.320739] [drm:omap_connector_mode_valid], connector: mode invalid: 18:"800x600" 60 35500 800 848 880 960 600 603 607 618 0x40 0x9 [ 4.330993] [drm:omap_connector_mode_valid], connector: mode invalid: 17:"1024x768" 60 56000 1024 1072 1104 1184 768 771 775 790 0x40 0x9 [ 4.346343] [drm:omap_connector_mode_valid], connector: mode invalid: 16:"1152x768" 60 62000 1152 1200 1232 1312 768 771 781 790 0x40 0x9 [ 4.346343] [drm:omap_connector_mode_valid], connector: mode invalid: 15:"1280x720" 60 63750 1280 1328 1360 1440 720 723 728 741 0x40 0x9 [ 4.372344] [drm:omap_connector_mode_valid], connector: mode valid: 13:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa [ 4.385223] [drm:omap_connector_mode_valid], connector: mode valid: 12:"640x480" 60 25200 640 656 752 800 480 490 492 525 0x40 0xa [ 4.397613] [drm:omap_connector_mode_valid], connector: mode valid: 11:"800x600" 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5 [ 4.410064] [drm:omap_connector_mode_valid], connector: mode valid: 10:"1280x720" 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5 [ 4.422912] [drm:omap_connector_mode_valid], connector: mode valid: 9:"1360x768" 60 85500 1360 1424 1536 1792 768 771 777 795 0x48 0x5 [ 4.422912] [drm:drm_mode_debug_printmodeline], Modeline 20:"640x480" 59 23500 640 688 720 800 480 483 487 494 0x40 0x9 [ 4.447021] [drm:drm_mode_prune_invalid], Not using 640x480 mode -2 [ 4.447021] [drm:drm_mode_debug_printmodeline], Modeline 19:"720x480" 59 26000 720 768 800 880 480 483 493 499 0x40 0x9 [ 4.458312] [drm:drm_mode_prune_invalid], Not using 720x480 mode -2 [ 4.458312] [drm:drm_mode_debug_printmodeline], Modeline 18:"800x600" 60 35500 800 848 880 960 600 603 607 618 0x40 0x9 [ 4.482971] [drm:drm_mode_prune_invalid], Not using 800x600 mode -2 [ 4.489593] [drm:drm_mode_debug_printmodeline], Modeline 17:"1024x768" 60 56000 1024 1072 1104 1184 768 771 775 790 0x40 0x9 [ 4.489593] [drm:drm_mode_prune_invalid], Not using 1024x768 mode -2 [ 4.489593] [drm:drm_mode_debug_printmodeline], Modeline 16:"1152x768" 60 62000 1152 1200 1232 1312 768 771 781 790 0x40 0x9 [ 4.519927] [drm:drm_mode_prune_invalid], Not using 1152x768 mode -2 [ 4.519927] [drm:drm_mode_debug_printmodeline], Modeline 15:"1280x720" 60 63750 1280 1328 1360 1440 720 723 728 741 0x40 0x9 [ 4.538452] [drm:drm_mode_prune_invalid], Not using 1280x720 mode -2 [ 4.542572] [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:6:HDMI-A-1] probed modes : [ 4.554443] [drm:drm_mode_debug_printmodeline], Modeline 9:"1360x768" 60 85500 1360 1424 1536 1792 768 771 777 795 0x48 0x5 [ 4.554443] [drm:drm_mode_debug_printmodeline], Modeline 10:"1280x720" 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5 [ 4.578002] [drm:drm_mode_debug_printmodeline], Modeline 13:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa [ 4.582702] [drm:drm_mode_debug_printmodeline], Modeline 11:"800x600" 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5 [ 4.601318] [drm:drm_mode_debug_printmodeline], Modeline 12:"640x480" 60 25200 640 656 752 800 480 490 492 525 0x40 0xa [ 4.612396] [drm:drm_setup_crtcs], [ 4.612396] [drm:drm_enable_connectors], connector 6 enabled? yes [ 4.622802] [drm:drm_target_preferred], looking for cmdline mode on connector 6 [ 4.630493] [drm:drm_target_preferred], found mode 1280x720 [ 4.630493] [drm:drm_setup_crtcs], picking CRTCs for 2048x2048 config [ 4.643157] [drm:omap_connector_attached_encoder], hdmi: found tv [ 4.649597] [drm:drm_setup_crtcs], desired mode 1280x720 set on crtc 7 [ 4.656494] [drm:omap_fbdev_create], create fbdev: 1280x720@32 [ 4.656524] [drm:omap_fbdev_create], fbi=ef186400, dev=ef184800 [ 4.668914] [drm:omap_framebuffer_init], create framebuffer: dev=ef184800, mode_cmd=ef833df0 (1280x720) [ 4.678833] [drm:omap_framebuffer_init], create: FB ID: 16 (efb78840) [ 4.685638] [drm:omap_framebuffer_init], allocating 3686400 bytes for fb 0 [ 4.730163] [drm:omap_fbdev_create], par=ef1ac140, 1280x720 [ 4.730163] [drm:omap_fbdev_create], allocated 1280x720 fb [ 4.743225] [drm:drm_crtc_helper_set_config], [ 4.743286] [drm:drm_crtc_helper_set_config], [CRTC:7] [FB:16] #connectors=1 (x y) (0 0) [ 4.743286] [drm:drm_crtc_helper_set_config], crtc has no fb, full mode set [ 4.743316] [drm:drm_crtc_helper_set_config], modes are different, full mode set [ 4.743316] [drm:drm_mode_debug_printmodeline], Modeline 0:"" 0 0 0 0 0 0 0 0 0 0 0x0 0x0 [ 4.743347] [drm:drm_mode_debug_printmodeline], Modeline 15:"1280x720" 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5 [ 4.743347] [drm:omap_connector_attached_encoder], hdmi: found tv [ 4.743377] [drm:drm_crtc_helper_set_config], encoder changed, full mode switch [ 4.743377] [drm:drm_crtc_helper_set_config], crtc changed, full mode switch [ 4.743408] [drm:drm_crtc_helper_set_config], [CONNECTOR:6:HDMI-A-1] to [CRTC:7] [ 4.743408] [drm:drm_crtc_helper_set_config], attempting to set mode from userspace [ 4.743408] [drm:drm_mode_debug_printmodeline], Modeline 15:"1280x720" 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5 [ 4.743408] [drm:omap_encoder_mode_fixup], tv [ 4.743469] [drm:omap_crtc_mode_fixup], gfx [ 4.743469] [drm:drm_crtc_helper_set_mode], [CRTC:7] [ 4.743469] [drm:omap_encoder_prepare], tv [ 4.743499] [drm:omap_encoder_dpms], tv: 3 [ 4.743499] [drm:omap_connector_dpms], hdmi: 3 [ 4.743530] [drm:omap_encoder_dpms], lcd: 3 [ 4.743530] [drm:omap_encoder_dpms], lcd2: 3 [ 4.743530] [drm:omap_crtc_prepare], gfx [ 4.743560] [drm:omap_crtc_dpms], gfx: 3 [ 4.743560] [drm:commit], gfx [ 4.743560] [drm:commit], 0x0 -> 0x0 (0) [ 4.743560] [drm:commit], 0,0 (null) 00000000 [ 4.743560] [drm:omap_crtc_mode_set], gfx: 0,0: 1280x720 [ 4.743621] [drm:update_scanout], gfx: 0,0: f0c00000 bd000000 (1280) [ 4.743652] [drm:drm_crtc_helper_set_mode], [ENCODER:4:TMDS-4] set [MODE:15:1280x720] [ 4.743652] [drm:omap_encoder_mode_set], tv: set mode: 1280x720 [ 4.743652] [drm:omap_connector_mode_set], hdmi: set mode: 17:"1280x720" 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5 [ 4.844940] omapdss DISPC error: timeout waiting for EVSYNC [ 4.944030] omapdss DISPC error: timeout waiting for EVSYNC [ 5.140350] omapdss DISPC error: timeout waiting for EVSYNC [ 5.238281] omapdss DISPC error: timeout waiting for EVSYNC [ 5.238281] [drm:omap_crtc_commit], gfx [ 5.238281] [drm:omap_crtc_dpms], gfx: 0 [ 5.238342] [drm:update_scanout], gfx: 0,0: f0c00000 bd000000 (1280) [ 5.238342] [drm:commit], gfx [ 5.238342] [drm:commit], 1280x720 -> 1280x720 (1280) [ 5.238372] [drm:commit], 0,0 f0c00000 bd000000 [ 5.238372] [drm:omap_encoder_commit], tv [ 5.238372] [drm:omap_encoder_dpms], tv: 0 [ 5.238372] [drm:omap_connector_dpms], hdmi: 0 [ 5.238494] [drm:drm_calc_timestamping_constants], crtc 7: hwmode: htotal 1650, vtotal 750, vdisplay 720 [ 5.238494] [drm:drm_calc_timestamping_constants], crtc 7: clock 74250 kHz framedur 16666500 linedur 22222, pixeldur 13 [ 5.238525] [drm:drm_crtc_helper_set_config], Setting connector DPMS state to on [ 5.238555] [drm:drm_crtc_helper_set_config], [CONNECTOR:6:HDMI-A-1] set DPMS on [ 5.238555] [drm:omap_encoder_dpms], lcd: 3 [ 5.238555] [drm:omap_encoder_dpms], lcd2: 3 [ 5.238677] [drm:drm_crtc_helper_set_config], [ 5.238677] [drm:drm_crtc_helper_set_config], [CRTC:7] [FB:16] #connectors=1 (x y) (0 0) [ 5.238677] [drm:omap_connector_attached_encoder], hdmi: found tv [ 5.238677] [drm:drm_crtc_helper_set_config], [CONNECTOR:6:HDMI-A-1] to [CRTC:7] [ 5.238739] [drm:omap_crtc_load_lut], gfx [ 5.238739] [drm:omap_crtc_load_lut], gfx [ 5.251586] Console: switching to colour frame buffer device 160x90 [ 5.251617] [drm:drm_crtc_helper_set_config], [ 5.251617] [drm:drm_crtc_helper_set_config], [CRTC:7] [FB:16] #connectors=1 (x y) (0 0) [ 5.251647] [drm:omap_connector_attached_encoder], hdmi: found tv [ 5.251647] [drm:drm_crtc_helper_set_config], [CONNECTOR:6:HDMI-A-1] to [CRTC:7] [ 5.251678] [drm:omap_crtc_load_lut], gfx [ 5.263336] [drm:omap_crtc_load_lut], gfx [ 5.646942] fb0: omapdrm frame buffer device [ 5.646942] drm: registered panic notifier [ 5.655761] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010). [ 5.655761] [drm] No driver support for vblank timestamp query. [ 5.668975] [drm] Initialized omapdrm 1.0.0 20110403 on minor 0