lrplayer:~ # cat /sys/kernel/debug/dri/0/i915_display_info CRTC info --------- CRTC 37: pipe: A, active=yes, (size=3840x2160), dither=no, bpp=24 fb: 73, pos: 0x0, size: 3840x2160 encoder 58: type: DDI B, connectors: connector 59: type: DP-1, status: connected, mode: id 0:"3840x2160" freq 60 clock 594000 hdisp 3840 hss 4016 hse 4104 htot 4400 vdisp 2160 vss 2168 vse 2178 vtot 2250 type 0x48 flags 0x5 cursor visible? no, position (0, 0), size 0x0, addr 0xffffffff num_scalers=2, scaler_users=0 scaler_id=-1, scalers[0]: use=no, mode=0, scalers[1]: use=no, mode=0 --Plane id 28: type=PRI, crtc_pos= 0x 0, crtc_size=3840x2160, src_pos=0.0000x0.0000, src_size=3840.0000x2160.0000, format=AR24 little-endian (0x34325241), rotation=0 (0x00000001) --Plane id 31: type=OVL, crtc_pos= 0x 0, crtc_size= 0x 0, src_pos=0.0000x0.0000, src_size=0.0000x0.0000, format=N/A, rotation=0 (0x00000001) --Plane id 34: type=CUR, crtc_pos= 0x 0, crtc_size= 0x 0, src_pos=0.0000x0.0000, src_size=0.0000x0.0000, format=N/A, rotation=0 (0x00000001) underrun reporting: cpu=yes pch=yes CRTC 47: pipe: B, active=no, (size=0x0), dither=no, bpp=0 underrun reporting: cpu=yes pch=yes CRTC 57: pipe: C, active=no, (size=0x0), dither=no, bpp=0 underrun reporting: cpu=yes pch=yes Connector info -------------- connector 59: type DP-1, status: connected name: physical dimensions: 1600x900mm subpixel order: Unknown CEA rev: 3 DPCD rev: 12 audio support: yes DP branch device present: yes Type: HDMI ID: MC2800 HW: 2.2 SW: 1.72 Max TMDS clock: 600000 kHz Max bpc: 16 modes: id 74:"3840x2160" freq 60 clock 594000 hdisp 3840 hss 4016 hse 4104 htot 4400 vdisp 2160 vss 2168 vse 2178 vtot 2250 type 0x48 flags 0x5 id 145:"4096x2160" freq 60 clock 594000 hdisp 4096 hss 4184 hse 4272 htot 4400 vdisp 2160 vss 2168 vse 2178 vtot 2250 type 0x40 flags 0x5 id 174:"4096x2160" freq 60 clock 593407 hdisp 4096 hss 4184 hse 4272 htot 4400 vdisp 2160 vss 2168 vse 2178 vtot 2250 type 0x40 flags 0x5 id 144:"4096x2160" freq 50 clock 594000 hdisp 4096 hss 5064 hse 5152 htot 5280 vdisp 2160 vss 2168 vse 2178 vtot 2250 type 0x40 flags 0x5 id 148:"4096x2160" freq 30 clock 297000 hdisp 4096 hss 4184 hse 4272 htot 4400 vdisp 2160 vss 2168 vse 2178 vtot 2250 type 0x40 flags 0x5 id 176:"4096x2160" freq 30 clock 296703 hdisp 4096 hss 4184 hse 4272 htot 4400 vdisp 2160 vss 2168 vse 2178 vtot 2250 type 0x40 flags 0x5 id 147:"4096x2160" freq 25 clock 297000 hdisp 4096 hss 5064 hse 5152 htot 5280 vdisp 2160 vss 2168 vse 2178 vtot 2250 type 0x40 flags 0x5 id 146:"4096x2160" freq 24 clock 297000 hdisp 4096 hss 5116 hse 5204 htot 5500 vdisp 2160 vss 2168 vse 2178 vtot 2250 type 0x40 flags 0x5 id 175:"4096x2160" freq 24 clock 296703 hdisp 4096 hss 5116 hse 5204 htot 5500 vdisp 2160 vss 2168 vse 2178 vtot 2250 type 0x40 flags 0x5 id 119:"3840x2160" freq 60 clock 593407 hdisp 3840 hss 4016 hse 4104 htot 4400 vdisp 2160 vss 2168 vse 2178 vtot 2250 type 0x40 flags 0x5 id 86:"3840x2160" freq 50 clock 594000 hdisp 3840 hss 4896 hse 4984 htot 5280 vdisp 2160 vss 2168 vse 2178 vtot 2250 type 0x40 flags 0x5 id 103:"3840x2160" freq 30 clock 297000 hdisp 3840 hss 4016 hse 4104 htot 4400 vdisp 2160 vss 2168 vse 2178 vtot 2250 type 0x40 flags 0x5 id 133:"3840x2160" freq 30 clock 296703 hdisp 3840 hss 4016 hse 4104 htot 4400 vdisp 2160 vss 2168 vse 2178 vtot 2250 type 0x40 flags 0x5 id 102:"3840x2160" freq 25 clock 297000 hdisp 3840 hss 4896 hse 4984 htot 5280 vdisp 2160 vss 2168 vse 2178 vtot 2250 type 0x40 flags 0x5 id 101:"3840x2160" freq 24 clock 297000 hdisp 3840 hss 5116 hse 5204 htot 5500 vdisp 2160 vss 2168 vse 2178 vtot 2250 type 0x40 flags 0x5 id 132:"3840x2160" freq 24 clock 296703 hdisp 3840 hss 5116 hse 5204 htot 5500 vdisp 2160 vss 2168 vse 2178 vtot 2250 type 0x40 flags 0x5 id 75:"1920x1080" freq 60 clock 148500 hdisp 1920 hss 2008 hse 2052 htot 2200 vdisp 1080 vss 1084 vse 1089 vtot 1125 type 0x40 flags 0x5 id 120:"1920x1080" freq 60 clock 148352 hdisp 1920 hss 2008 hse 2052 htot 2200 vdisp 1080 vss 1084 vse 1089 vtot 1125 type 0x40 flags 0x5 id 91:"1920x1080i" freq 60 clock 74250 hdisp 1920 hss 2008 hse 2052 htot 2200 vdisp 1080 vss 1084 vse 1094 vtot 1125 type 0x40 flags 0x15 id 126:"1920x1080i" freq 60 clock 74176 hdisp 1920 hss 2008 hse 2052 htot 2200 vdisp 1080 vss 1084 vse 1094 vtot 1125 type 0x40 flags 0x15 id 88:"1920x1080" freq 50 clock 148500 hdisp 1920 hss 2448 hse 2492 htot 2640 vdisp 1080 vss 1084 vse 1089 vtot 1125 type 0x40 flags 0x5 id 92:"1920x1080i" freq 50 clock 74250 hdisp 1920 hss 2448 hse 2492 htot 2640 vdisp 1080 vss 1084 vse 1094 vtot 1125 type 0x40 flags 0x15 id 98:"1920x1080" freq 30 clock 74250 hdisp 1920 hss 2008 hse 2052 htot 2200 vdisp 1080 vss 1084 vse 1089 vtot 1125 type 0x40 flags 0x5 id 130:"1920x1080" freq 30 clock 74176 hdisp 1920 hss 2008 hse 2052 htot 2200 vdisp 1080 vss 1084 vse 1089 vtot 1125 type 0x40 flags 0x5 id 97:"1920x1080" freq 25 clock 74250 hdisp 1920 hss 2448 hse 2492 htot 2640 vdisp 1080 vss 1084 vse 1089 vtot 1125 type 0x40 flags 0x5 id 96:"1920x1080" freq 24 clock 74250 hdisp 1920 hss 2558 hse 2602 htot 2750 vdisp 1080 vss 1084 vse 1089 vtot 1125 type 0x40 flags 0x5 id 129:"1920x1080" freq 24 clock 74176 hdisp 1920 hss 2558 hse 2602 htot 2750 vdisp 1080 vss 1084 vse 1089 vtot 1125 type 0x40 flags 0x5 id 114:"2880x576" freq 50 clock 108000 hdisp 2880 hss 2928 hse 3184 htot 3456 vdisp 576 vss 581 vse 586 vtot 625 type 0x40 flags 0xa id 138:"2880x480" freq 60 clock 108108 hdisp 2880 hss 2944 hse 3192 htot 3432 vdisp 480 vss 489 vse 495 vtot 525 type 0x40 flags 0xa id 110:"2880x480" freq 60 clock 108000 hdisp 2880 hss 2944 hse 3192 htot 3432 vdisp 480 vss 489 vse 495 vtot 525 type 0x40 flags 0xa id 80:"1280x1024" freq 60 clock 108000 hdisp 1280 hss 1328 hse 1440 htot 1688 vdisp 1024 vss 1025 vse 1028 vtot 1066 type 0x40 flags 0x5 id 79:"1152x864" freq 60 clock 81579 hdisp 1152 hss 1216 hse 1336 htot 1520 vdisp 864 vss 865 vse 868 vtot 895 type 0x0 flags 0x6 id 89:"1280x720" freq 60 clock 74250 hdisp 1280 hss 1390 hse 1430 htot 1650 vdisp 720 vss 725 vse 730 vtot 750 type 0x40 flags 0x5 id 125:"1280x720" freq 60 clock 74176 hdisp 1280 hss 1390 hse 1430 htot 1650 vdisp 720 vss 725 vse 730 vtot 750 type 0x40 flags 0x5 id 90:"1280x720" freq 50 clock 74250 hdisp 1280 hss 1720 hse 1760 htot 1980 vdisp 720 vss 725 vse 730 vtot 750 type 0x40 flags 0x5 id 113:"1440x576" freq 50 clock 54000 hdisp 1440 hss 1464 hse 1592 htot 1728 vdisp 576 vss 581 vse 586 vtot 625 type 0x40 flags 0xa id 78:"1024x768" freq 60 clock 65000 hdisp 1024 hss 1048 hse 1184 htot 1344 vdisp 768 vss 771 vse 777 vtot 806 type 0x40 flags 0xa id 137:"1440x480" freq 60 clock 54054 hdisp 1440 hss 1472 hse 1596 htot 1716 vdisp 480 vss 489 vse 495 vtot 525 type 0x40 flags 0xa id 109:"1440x480" freq 60 clock 54000 hdisp 1440 hss 1472 hse 1596 htot 1716 vdisp 480 vss 489 vse 495 vtot 525 type 0x40 flags 0xa id 77:"800x600" freq 60 clock 40000 hdisp 800 hss 840 hse 968 htot 1056 vdisp 600 vss 601 vse 605 vtot 628 type 0x40 flags 0x5 id 95:"720x576" freq 50 clock 27000 hdisp 720 hss 732 hse 796 htot 864 vdisp 576 vss 581 vse 586 vtot 625 type 0x40 flags 0xa id 127:"720x480" freq 60 clock 27027 hdisp 720 hss 736 hse 798 htot 858 vdisp 480 vss 489 vse 495 vtot 525 type 0x40 flags 0xa id 93:"720x480" freq 60 clock 27000 hdisp 720 hss 736 hse 798 htot 858 vdisp 480 vss 489 vse 495 vtot 525 type 0x40 flags 0xa id 121:"640x480" freq 60 clock 25200 hdisp 640 hss 656 hse 752 htot 800 vdisp 480 vss 490 vse 492 vtot 525 type 0x40 flags 0xa id 76:"640x480" freq 60 clock 25175 hdisp 640 hss 656 hse 752 htot 800 vdisp 480 vss 490 vse 492 vtot 525 type 0x40 flags 0xa id 83:"720x400" freq 70 clock 28320 hdisp 720 hss 738 hse 846 htot 900 vdisp 400 vss 412 vse 414 vtot 449 type 0x40 flags 0x6 connector 66: type DP-2, status: disconnected DPCD rev: 0 audio support: no DP branch device present: no modes: connector 70: type HDMI-A-1, status: disconnected audio support: no modes: