I call 'sysctl -a|less and get such output. It's only a small selection of the output, in fact there a hundreds of lines with the ttm-message.
But off course you are right: there is no systemctl on Dragonfly, but sysctl. Sorry.
<6>[drm] radeon: 768M of VRAM memory ready
<118>Oct 20 17:09:09 f2a85vpro kernel: [TTM] Zone kernel: Available graphics memory: 65512 ki<
6>[drm] radeon: 1024M of GTT memory ready.
<6>[drm] Loading ARUBA Microcode
<118>Oct 20 17:09:09 f2a85vpro kernel: [TTM] Zone dma32: Available graphics memory: 65512 kiB
<118>Oct 20 17:09:09 f2a85vpro kernel: [TTM] Initializing pool allocator
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] radeon: 768M of VRAM memory ready
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] Loading ARUBA Microcode
<6>[drm] Internal thermal controller without fan control
<6>[drm] radeon: dpm initialized
<6>[drm] Found VCE firmware/feedback version 50.0.1 / 17!
<6>[drm] GART: num cpu pages 262144, num gpu pages 262144
<6>[drm] PCIE GART of 1024M enabled (table at 0x00000000001D6000).
ttm_check_under_lowerlimit: stub
drm0: info: WB enabled
drm0: info: fence driver on ring 0 use gpu addr 0x0000000030000c00 and cpu addr 0x0xffffb80003937c00
drm0: info: fence driver on ring 5 use gpu addr 0x0000000000075a18 and cpu addr 0x0xfffff80691d59a18
drm0: info: fence driver on ring 6 use gpu addr 0x0000000030000c18 and cpu addr 0x0xffffb80003937c18
drm0: info: fence driver on ring 7 use gpu addr 0x0000000030000c1c and cpu addr 0x0xffffb80003937c1c
drm0: info: fence driver on ring 1 use gpu addr 0x0000000030000c04 and cpu addr 0x0xffffb80003937c04
drm0: info: fence driver on ring 2 use gpu addr 0x0000000030000c08 and cpu addr 0x0xffffb80003937c08
drm0: info: fence driver on ring 3 use gpu addr 0x0000000030000c0c and cpu addr 0x0xffffb80003937c0c
drm0: info: fence driver on ring 4 use gpu addr 0x0000000030000c10 and cpu addr 0x0xffffb80003937c10
<6>[drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
<6>[drm] Driver supports precise vblank timestamp query.
<6>[drm] radeon: irq initialized.
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
<6>[drm] ring test on 0 succeeded in 1 usecs
<6>[drm] ring test on 3 succeeded in 2 usecs
<6>[drm] ring test on 4 succeeded in 2 usecs
ttm_check_under_lowerlimit: stub
<6>[drm] ring test on 5 succeeded in 1 usecs
<6>[drm] UVD initialized successfully.
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] Internal thermal controller without fan control
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] radeon: dpm initialized
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] Found VCE firmware/feedback version 50.0.1 / 17!
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] GART: num cpu pages 262144, num gpu pages 262144
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] PCIE GART of 1024M enabled (table at 0x00000000001D6000).
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] Driver supports precise vblank timestamp query.
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] radeon: irq initialized.
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] ring test on 0 succeeded in 1 usecs
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] ring test on 3 succeeded in 2 usecs
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] ring test on 4 succeeded in 2 usecs
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] ring test on 5 succeeded in 1 usecs
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] UVD initialized successfully.
<6>[drm] ring test on 6 succeeded in 11 usecs
<6>[drm] ring test on 7 succeeded in 2 usecs
<6>[drm] VCE initialized successfully.
ttm_check_under_lowerlimit: stub
<6>[drm] ib test on ring 0 succeeded in 0 usecs
<6>[drm] ib test on ring 3 succeeded in 0 usecs
<6>[drm] ib test on ring 4 succeeded in 0 usecs
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] ring test on 6 succeeded in 11 usecs
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] ring test on 7 succeeded in 2 usecs
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] VCE initialized successfully.
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] ib test on ring 0 succeeded in 0 usecs
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] ib test on ring 3 succeeded in 0 usecs
<118>Oct 20 17:09:09 f2a85vpro kernel: [drm] ib test on ring 4 succeeded in 0 usecs
xhci1: Controller halt timeout.
<6>[drm] ib test on ring 5 succeeded
<118>Oct 20 17:09:10 f2a85vpro kernel: [drm] ib test on ring 5 succeeded
<6>[drm] ib test on ring 6 succeeded
<118>Oct 20 17:09:10 f2a85vpro kernel: [drm] ib test on ring 6 succeeded
<6>[drm] ib test on ring 7 succeeded
<6>[drm] radeon_device_init: Taking over the fictitious range 0xc0000000-0xd0000000
<6>[drm] hw_i2c forced on, you may experience display detection problems!
tunable drm.video.DP-1 is not set
tunable drm.video.VGA-1 is not set
tunable drm.video.DVI-D-1 is not set
<6>[drm] Radeon Display Connectors
<6>[drm] Connector 0:
<6>[drm] DP-1
<6>[drm] HPD1
<6>[drm] DDC: 0x6530 0x6530 0x6534 0x6534 0x6538 0x6538 0x653c 0x653c
<6>[drm] Encoders:
<6>[drm] DFP1: INTERNAL_UNIPHY2
<6>[drm] Connector 1:
<6>[drm] VGA-1
<6>[drm] HPD2
<6>[drm] DDC: 0x6540 0x6540 0x6544 0x6544 0x6548 0x6548 0x654c 0x654c
<6>[drm] Encoders:
<6>[drm] CRT1: INTERNAL_UNIPHY2
<6>[drm] CRT1: NUTMEG
<6>[drm] Connector 2:
<6>[drm] DVI-D-1
<6>[drm] HPD3
<6>[drm] DDC: 0x6550 0x6550 0x6554 0x6554 0x6558 0x6558 0x655c 0x655c
<6>[drm] Encoders:
<6>[drm] DFP2: INTERNAL_UNIPHY
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] ib test on ring 7 succeeded
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] radeon_device_init: Taking over the fictitious range 0xc0000000-0xd0000000
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] hw_i2c forced on, you may experience display detection problems!
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] Radeon Display Connectors
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] Connector 0:
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] DP-1
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] HPD1
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] DDC: 0x6530 0x6530 0x6534 0x6534 0x6538 0x6538 0x653c 0x653c
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] Encoders:
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] DFP1: INTERNAL_UNIPHY2
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] Connector 1:
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] VGA-1
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] HPD2
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] DDC: 0x6540 0x6540 0x6544 0x6544 0x6548 0x6548 0x654c 0x654c
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] Encoders:
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] CRT1: INTERNAL_UNIPHY2
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] CRT1: NUTMEG
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] Connector 2:
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] DVI-D-1
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] HPD3
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] DDC: 0x6550 0x6550 0x6554 0x6554 0x6558 0x6558 0x655c 0x655c
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] Encoders:
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] DFP2: INTERNAL_UNIPHY
<6>[drm] fb mappable at 0xC03DA000
<6>[drm] vram apper at 0xC0000000
<6>[drm] size 5242880
<6>[drm] fb depth is 24
<6>[drm] pitch is 5120
kms console: xpixels 1280 ypixels 1024
<6>[drm] Initialized radeon 2.50.0 20080528 for dev_name on minor 0
drm0 on vgapci0
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] fb mappable at 0xC03DA000
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] vram apper at 0xC0000000
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] size 5242880
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] fb depth is 24
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] pitch is 5120
<118>Oct 20 17:09:11 f2a85vpro kernel: [drm] Initialized radeon 2.50.0 20080528 for dev_name on minor 0
xhci1: Controller reset timeout.
uhub1: <0x1022 XHCI root HUB, class 9/0, rev 3.00/1.00, addr 1> on usbus1
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
uhub1: 4 ports with 4 removable, self powered
ugen1.2: <Unknown> at usbus1 (disconnected)
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
xhci1: Resetting controller
ugen1.2: <Unknown> at usbus1 (disconnected)
uhub1: at usbus1, port 1, addr 1 (disconnected)
uhub1: detached
xhci1: Controller halt timeout.
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub
ttm_check_under_lowerlimit: stub