Cannot create DRM context without X server running. about sfml

[binary1248]

The DRM implementation was written/ported by @mickelson, @oomek and @substring. Maybe they can look into this.

[Omnomios]

Further investigation I found this in the DRM logs when I switched it to debug logging

Apr 14 12:47:22 localhost kernel: [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:450:DP-1] probed modes :
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "3840x2160": 60 533250 3840 3888 3920 4000 2160 2214 2219 2222 0x48 0x9
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "3840x2160": 30 266640 3840 3848 3992 4000 2160 2214 2219 2222 0x40 0x9
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "2560x1440": 60 241500 2560 2608 2640 2720 1440 1443 1448 1481 0x40 0x9
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "1920x1080": 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "1920x1080": 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "1920x1080": 60 148352 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "1600x900": 60 108000 1600 1624 1704 1800 900 901 904 1000 0x40 0x5
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "1280x1024": 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "1280x800": 60 83500 1280 1352 1480 1680 800 803 809 831 0x40 0x6
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "1280x720": 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "1280x720": 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "1280x720": 60 74176 1280 1390 1430 1650 720 725 730 750 0x40 0x5
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "1024x768": 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "800x600": 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "720x480": 60 27027 720 736 798 858 480 489 495 525 0x40 0xa
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "720x480": 60 27000 720 736 798 858 480 489 495 525 0x40 0xa
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "640x480": 60 25200 640 656 752 800 480 490 492 525 0x40 0xa
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "640x480": 60 25175 640 656 752 800 480 490 492 525 0x40 0xa
Apr 14 12:47:22 localhost kernel: [drm:drm_mode_debug_printmodeline] Modeline "640x480": 60 25175 640 656 752 800 480 490 492 525 0x40 0xa
Apr 14 12:47:23 localhost kernel: [drm:rockchip_gem_get_pages.constprop.0] bank_bit_first = 0xd, bank_bit_mask = 0x7
Apr 14 12:47:23 localhost kernel: [drm:rockchip_gem_get_pages.constprop.0] rockchip_gem_get_pages, 222, end = 4, n_pages = 4
Apr 14 12:47:23 localhost kernel: [drm:rockchip_gem_get_pages.constprop.0] bank_bit_first = 0xd, bank_bit_mask = 0x7
Apr 14 12:47:23 localhost kernel: [drm:rockchip_gem_get_pages.constprop.0] rockchip_gem_get_pages, 222, end = 520, n_pages = 520
Apr 14 12:47:23 localhost kernel: rockchip-drm display-subsystem: [drm:drm_mode_addfb2] [FB:464]
Apr 14 12:47:23 localhost kernel: [drm:drm_mode_setcrtc] [CRTC:157:video_port2]
Apr 14 12:47:23 localhost kernel: [drm:drm_mode_setcrtc] Invalid pixel format AR24 little-endian (0x34325241), modifier 0xffffffffffffff