ls /sys/class/drm/ card0 card1 card1-LVDS-1 renderD128 version root@am62pxx-evm:~# for f in /sys/class/drm/card*-*/status; do echo "$f: $(cat $f)"; done /sys/class/drm/card1-LVDS-1/status: connected root@am62pxx-evm:~# cat /sys/class/drm/card1-LVDS-1/status connected root@am62pxx-evm:~# cat /sys/class/drm/card1-LVDS-1/enabled enabled root@am62pxx-evm:~# cat /sys/class/drm/card1-LVDS-1/modes 1920x720 root@am62pxx-evm:~# modetest -M tidss Encoders: id crtc type possible crtcs possible clones 40 39 none 0x00000001 0x00000001 Connectors: id encoder status name size (mm) modes encoders 41 40 connected LVDS-1 244x92 1 40 modes: index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot #0 1920x720 60.00 1920 1992 2064 2136 720 723 726 728 93301 flags: ; type: preferred, driver props: 1 EDID: flags: immutable blob blobs: value: 2 DPMS: flags: enum enums: On=0 Standby=1 Suspend=2 Off=3 value: 0 5 link-status: flags: enum enums: Good=0 Bad=1 value: 0 6 non-desktop: flags: immutable range values: 0 1 value: 0 4 TILE: flags: immutable blob blobs: value: CRTCs: id fb pos size 39 43 (0,0) (1920x720) #0 1920x720 60.00 1920 1992 2064 2136 720 723 726 728 93301 flags: ; type: preferred, driver props: 24 VRR_ENABLED: flags: range values: 0 1 value: 0 27 CTM: flags: blob blobs: value: 28 GAMMA_LUT: flags: blob blobs: value: 29 GAMMA_LUT_SIZE: flags: immutable range values: 0 4294967295 value: 256 Planes: id crtc fb CRTC x,y x,y gamma size possible crtcs 32 39 43 0,0 0,0 0 0x00000001 formats: AR12 AB12 RA12 RG16 BG16 AR15 AB15 AR24 AB24 RA24 BA24 RG24 BG24 AR30 AB30 XR12 XB12 RX12 XR15 XB15 XR24 XB24 RX24 BX24 XR30 XB30 YUYV UYVY NV12 props: 8 type: flags: immutable enum enums: Overlay=0 Primary=1 Cursor=2 value: 1 30 IN_FORMATS: flags: immutable blob blobs: value: 01000000000000001d00000018000000 01000000900000004152313241423132 52413132524731364247313641523135 41423135415232344142323452413234 42413234524732344247323441523330 41423330585231325842313252583132 58523135584231355852323458423234 52583234425832345852333058423330 59555956555956594e56313200000000 ffffff1f000000000000000000000000 0000000000000000 in_formats blob decoded: AR12: LINEAR(0x0) AB12: LINEAR(0x0) RA12: LINEAR(0x0) RG16: LINEAR(0x0) BG16: LINEAR(0x0) AR15: LINEAR(0x0) AB15: LINEAR(0x0) AR24: LINEAR(0x0) AB24: LINEAR(0x0) RA24: LINEAR(0x0) BA24: LINEAR(0x0) RG24: LINEAR(0x0) BG24: LINEAR(0x0) AR30: LINEAR(0x0) AB30: LINEAR(0x0) XR12: LINEAR(0x0) XB12: LINEAR(0x0) RX12: LINEAR(0x0) XR15: LINEAR(0x0) XB15: LINEAR(0x0) XR24: LINEAR(0x0) XB24: LINEAR(0x0) RX24: LINEAR(0x0) BX24: LINEAR(0x0) XR30: LINEAR(0x0) XB30: LINEAR(0x0) YUYV: LINEAR(0x0) UYVY: LINEAR(0x0) NV12: LINEAR(0x0) 34 zpos: flags: range values: 0 0 value: 0 35 COLOR_ENCODING: flags: enum enums: ITU-R BT.601 YCbCr=0 ITU-R BT.709 YCbCr=1 value: 0 36 COLOR_RANGE: flags: enum enums: YCbCr limited range=0 YCbCr full range=1 value: 1 37 alpha: flags: range values: 0 65535 value: 65535 38 pixel blend mode: flags: enum enums: Pre-multiplied=0 Coverage=1 value: 0 Frame buffers: id size pitch root@am62pxx-evm:~# dmesg | grep -i "drm\|tidss\|HDMI\|LVDS\|connector" [ 0.365940] /bus@f0000/i2c@20000000/usb-power-controller@3f/connector: Fixed dependency cycle(s) with /bus@f0000/usb@f900000/usb@31000000 [ 0.378620] /bus@f0000/usb@f900000/usb@31000000: Fixed dependency cycle(s) with /bus@f0000/i2c@20000000/usb-power-controller@3f/connector [ 0.458162] /bus@f0000/i2c@20000000/usb-power-controller@3f/connector: Fixed dependency cycle(s) with /bus@f0000/usb@f900000/usb@31000000 [ 0.471668] /bus@f0000/usb@f900000/usb@31000000: Fixed dependency cycle(s) with /bus@f0000/i2c@20000000/usb-power-controller@3f/connector [ 1.225152] /bus@f0000/i2c@20000000/usb-power-controller@3f/connector: Fixed dependency cycle(s) with /bus@f0000/usb@f900000/usb@31000000 [ 1.724599] /bus@f0000/i2c@20000000/usb-power-controller@3f/connector: Fixed dependency cycle(s) with /bus@f0000/usb@f900000/usb@31000000 [ 1.737077] /bus@f0000/usb@f900000/usb@31000000: Fixed dependency cycle(s) with /bus@f0000/i2c@20000000/usb-power-controller@3f/connector [ 3.717538] systemd[1]: Starting Load Kernel Module drm... [ 8.404300] tidss 30220000.dss: failed to attach power domains -22 [ 8.411634] tidss 30220000.dss: probe with driver tidss failed with error -22 [ 8.825713] [drm] Initialized tidss 1.0.0 for 30200000.dss on minor 1 [ 8.871325] [drm] Initialized pvr 25.2.6850647 for fd80000.gpu on minor 0 [ 8.990854] tidss 30200000.dss: [drm] fb0: tidssdrmfb frame buffer device