A simple drm framebuffer tool to test drm devices. It takes data from stdin and will put it to the display.
The behavior of this tool should be similar to what was possible with:
dd if=/dev/urandom of=/dev/fb0The following would be the equivalent:
dd if=/dev/urandom | drm-framebuffer -d /dev/dri/card0 -c HDMI-A-1Additionally you can request information about the display configuration with the following two commands:
# Available connectors, crtcs and encoders
drm-framebuffer -d /dev/dri/card0 -l
connectors:
Number: 95 Name: eDP-1 Encoder: 94 Crtc: 51
Number: 103 Name: DP-1 Encoder: 102 Crtc: 72
Number: 112 Name: HDMI-A-1 Encoder: 0
Number: 118 Name: DP-2 Encoder: 0
Number: 124 Name: HDMI-A-2 Encoder: 0
Framebuffers:
CRTCs: 51 72 93
encoders: 94 102 104 105 106 117 119 120 121
#Resolution
drm-framebuffer -d /dev/dri/card0 -c DP-1 -r
#0 - 3840x2160@60 (ht: 4000 hs: 3888 he: 3920 hskew: 0, vt: 2222 vs: 2163 ve: 2168 vscan: 0, flags: 0x9) - preferred
#1 - 3840x2160@60 (ht: 4400 hs: 4016 he: 4104 hskew: 0, vt: 2250 vs: 2168 ve: 2178 vscan: 0, flags: 0x6)
#2 - 3840x2160@60 (ht: 4400 hs: 4016 he: 4104 hskew: 0, vt: 2250 vs: 2168 ve: 2178 vscan: 0, flags: 0x5)
#3 - 3840x2160@60 (ht: 4400 hs: 4016 he: 4104 hskew: 0, vt: 2250 vs: 2168 ve: 2178 vscan: 0, flags: 0x5)
#4 - 3840x2160@50 (ht: 5280 hs: 4896 he: 4984 hskew: 0, vt: 2250 vs: 2168 ve: 2178 vscan: 0, flags: 0x5)
#5 - 3840x2160@30 (ht: 4400 hs: 4016 he: 4104 hskew: 0, vt: 2250 vs: 2168 ve: 2178 vscan: 0, flags: 0x5)
#6 - 3840x2160@30 (ht: 4400 hs: 4016 he: 4104 hskew: 0, vt: 2250 vs: 2168 ve: 2178 vscan: 0, flags: 0x5)
#7 - 3840x2160@25 (ht: 5280 hs: 4896 he: 4984 hskew: 0, vt: 2250 vs: 2168 ve: 2178 vscan: 0, flags: 0x5)
#8 - 3840x2160@24 (ht: 5500 hs: 5116 he: 5204 hskew: 0, vt: 2250 vs: 2168 ve: 2178 vscan: 0, flags: 0x5)
#9 - 3840x2160@24 (ht: 5500 hs: 5116 he: 5204 hskew: 0, vt: 2250 vs: 2168 ve: 2178 vscan: 0, flags: 0x5)
#10 - 2560x1440@60 (ht: 2720 hs: 2608 he: 2640 hskew: 0, vt: 1481 vs: 1443 ve: 1448 vscan: 0, flags: 0x6)
#11 - 2048x1280@60 (ht: 2208 hs: 2096 he: 2128 hskew: 0, vt: 1317 vs: 1283 ve: 1289 vscan: 0, flags: 0x6)
#12 - 1920x1080@60 (ht: 2200 hs: 2008 he: 2052 hskew: 0, vt: 1125 vs: 1084 ve: 1089 vscan: 0, flags: 0x5)
#13 - 1920x1080@60 (ht: 2200 hs: 2008 he: 2052 hskew: 0, vt: 1125 vs: 1084 ve: 1089 vscan: 0, flags: 0x5)
#14 - 1920x1080@50 (ht: 2640 hs: 2448 he: 2492 hskew: 0, vt: 1125 vs: 1084 ve: 1089 vscan: 0, flags: 0x5)
#15 - 1920x1080@30 (ht: 2200 hs: 2008 he: 2052 hskew: 0, vt: 1125 vs: 1084 ve: 1089 vscan: 0, flags: 0x5)
#16 - 1920x1080@30 (ht: 2200 hs: 2008 he: 2052 hskew: 0, vt: 1125 vs: 1084 ve: 1089 vscan: 0, flags: 0x5)
#17 - 1920x1080@25 (ht: 2640 hs: 2448 he: 2492 hskew: 0, vt: 1125 vs: 1084 ve: 1089 vscan: 0, flags: 0x5)
#18 - 1920x1080@24 (ht: 2750 hs: 2558 he: 2602 hskew: 0, vt: 1125 vs: 1084 ve: 1089 vscan: 0, flags: 0x5)
#19 - 1920x1080@24 (ht: 2750 hs: 2558 he: 2602 hskew: 0, vt: 1125 vs: 1084 ve: 1089 vscan: 0, flags: 0x5)
#20 - 1600x900@60 (ht: 1800 hs: 1624 he: 1704 hskew: 0, vt: 1000 vs: 901 ve: 904 vscan: 0, flags: 0x5)
#21 - 1280x1024@75 (ht: 1688 hs: 1296 he: 1440 hskew: 0, vt: 1066 vs: 1025 ve: 1028 vscan: 0, flags: 0x5)
#22 - 1280x1024@60 (ht: 1688 hs: 1328 he: 1440 hskew: 0, vt: 1066 vs: 1025 ve: 1028 vscan: 0, flags: 0x5)
#23 - 1152x864@75 (ht: 1600 hs: 1216 he: 1344 hskew: 0, vt: 900 vs: 865 ve: 868 vscan: 0, flags: 0x5)
#24 - 1280x720@60 (ht: 1650 hs: 1390 he: 1430 hskew: 0, vt: 750 vs: 725 ve: 730 vscan: 0, flags: 0x5)
#25 - 1280x720@60 (ht: 1650 hs: 1390 he: 1430 hskew: 0, vt: 750 vs: 725 ve: 730 vscan: 0, flags: 0x5)
#26 - 1280x720@50 (ht: 1980 hs: 1720 he: 1760 hskew: 0, vt: 750 vs: 725 ve: 730 vscan: 0, flags: 0x5)
#27 - 1024x768@75 (ht: 1312 hs: 1040 he: 1136 hskew: 0, vt: 800 vs: 769 ve: 772 vscan: 0, flags: 0x5)
#28 - 1024x768@60 (ht: 1344 hs: 1048 he: 1184 hskew: 0, vt: 806 vs: 771 ve: 777 vscan: 0, flags: 0xA)
#29 - 800x600@75 (ht: 1056 hs: 816 he: 896 hskew: 0, vt: 625 vs: 601 ve: 604 vscan: 0, flags: 0x5)
#30 - 800x600@60 (ht: 1056 hs: 840 he: 968 hskew: 0, vt: 628 vs: 601 ve: 605 vscan: 0, flags: 0x5)
#31 - 720x576@50 (ht: 864 hs: 732 he: 796 hskew: 0, vt: 625 vs: 581 ve: 586 vscan: 0, flags: 0xA)
#32 - 720x480@60 (ht: 858 hs: 736 he: 798 hskew: 0, vt: 525 vs: 489 ve: 495 vscan: 0, flags: 0xA)
#33 - 720x480@60 (ht: 858 hs: 736 he: 798 hskew: 0, vt: 525 vs: 489 ve: 495 vscan: 0, flags: 0xA)
#34 - 640x480@75 (ht: 840 hs: 656 he: 720 hskew: 0, vt: 500 vs: 481 ve: 484 vscan: 0, flags: 0xA)
#35 - 640x480@60 (ht: 800 hs: 656 he: 752 hskew: 0, vt: 525 vs: 490 ve: 492 vscan: 0, flags: 0xA)
#36 - 640x480@60 (ht: 800 hs: 656 he: 752 hskew: 0, vt: 525 vs: 490 ve: 492 vscan: 0, flags: 0xA)
#37 - 720x400@70 (ht: 900 hs: 738 he: 846 hskew: 0, vt: 449 vs: 412 ve: 414 vscan: 0, flags: 0x6)The -s option can be used to force a specific resolution from the list received with -r:
dd if=/dev/urandom | drm-framebuffer -d /dev/dri/card0 -c DP-1 -s 36
This example sets the resolution to 640x480@60.
This tool requires libdrm to compile and work.
To compile the tool simply type "make" with a valid gcc set trough the environment variable CC. Also make sure the drm headers and libraries are available (LDFLAGS, CFLAGS).
Copy the executable drm-framebuffer to your target and execute it.
sudo apt update sudo apt install imagemagick sudo systemctl stop lightdm convert -resize 720x ./test.png - | convert -extent 1920x1080 -gravity Center - bgra:- | ./drm-framebuffer -d /dev/dri/card0 -c HDMI-A-1