So I have plugged in and been able to pull EDID information for the Chalkboard Electronics 10" display.
Screen 0: minimum 320 x 200, current 1280 x 800, maximum 2048 x 2048
HDMI-0 connected 1280x800+0+0 (0x41) normal (normal left inverted right x axis y axis) 217mm x 136mm
Identifier: 0x40
Timestamp: 1798433513
Subpixel: unknown
Gamma: 1.0:1.0:1.0
Brightness: 1.0
Clones:
CRTC: 0
CRTCs: 0
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
EDID:
00ffffffffffff0030e4450300000000
0015010490160e7802e887965a559528
22515500000001010101010101010101
0101010101014c1d00ec502018304030
5700d9880000001b1612008050201630
30204700d9880000001b000000fe0043
3347524e803130315758310a00000000
00004132a80000000001010a2020009a
1280x800 (0x41) 75.0MHz +HSync -VSync *current +preferred
h: width 1280 start 1344 end 1392 total 1516 skew 0 clock 49.5KHz
v: height 800 start 805 end 812 total 824 clock 60.0Hz
1280x800 (0x42) 46.3MHz +HSync -VSync
h: width 1280 start 1328 end 1360 total 1408 skew 0 clock 32.9KHz
v: height 800 start 804 end 811 total 822 clock 40.0Hz
Also from /sys/class/drm/card0/card0-HDMI-A-1/edid
parse-edid: parse-edid version 2.0.0
parse-edid: EDID checksum passed.
EDID version 1 revision 4
Section “Monitor”
Block type: 2:0 3:fe
Block type: 2:0 3:0
Identifier “LGD:4503”
VendorName “LGD”
ModelName “LGD:4503”
Block type: 2:0 3:fe
Block type: 2:0 3:0
DPMS capabilities: Active off:no Suspend:no Standby:no
Mode “1280x800” # vfreq 60.039Hz, hfreq 49.472kHz
DotClock 75.000000
HTimings 1280 1344 1392 1516
VTimings 800 805 812 824
Flags “-HSync” “+VSync”
EndMode
Mode “1280x800” # vfreq 40.004Hz, hfreq 32.884kHz
DotClock 46.300000
HTimings 1280 1328 1360 1408
VTimings 800 804 811 822
Flags “-HSync” “+VSync”
EndMode
Block type: 2:0 3:fe
Block type: 2:0 3:0
EndSection
The LCD only supports one resolution and it isn’t in the support resolution list. Could I have this support added to the DRM driver?
Also from the kernel logs I am getting:
[ 3351.400053] [drm:drm_ioctl], pid=254, cmd=0xc01864b1, nr=0xb1, dev 0xe200, auth=1
[ 3351.400356] [drm:drm_ioctl], ret = -38
[ 3361.221450] [drm:output_poll_execute], [CONNECTOR:5:HDMI-A-1] status updated from 1 to 1
[ 3371.252258] [drm:output_poll_execute], [CONNECTOR:5:HDMI-A-1] status updated from 1 to 1
[ 3381.283534] [drm:output_poll_execute], [CONNECTOR:5:HDMI-A-1] status updated from 1 to 1
[ 3391.314771] [drm:output_poll_execute], [CONNECTOR:5:HDMI-A-1] status updated from 1 to 1
[ 3401.346046] [drm:output_poll_execute], [CONNECTOR:5:HDMI-A-1] status updated from 1 to 1
repeated.