rx 480 linux screen turning off.

dmesg.log

[  208.345352] [drm] amdgpu kernel modesetting enabled.
[  208.348619] AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>
[  208.348622] AMD IOMMUv2 functionality not available on this system
[  208.351608] CRAT table not found
[  208.351611] Finished initializing topology ret=0
[  208.351666] kfd kfd: Initialized module
[  208.351870] checking generic (e0000000 300000) vs hw (e0000000 10000000)
[  208.351874] fb: switching to amdgpudrmfb from EFI VGA
[  208.351919] Console: switching to colour dummy device 80x25
[  208.352246] [drm] initializing kernel modesetting (POLARIS10 0x1002:0x67DF 0x1682:0x9480 0xC7).
[  208.352258] [drm] register mmio base: 0xF7D00000
[  208.352259] [drm] register mmio size: 262144
[  208.352264] [drm] doorbell mmio base: 0xF0000000
[  208.352266] [drm] doorbell mmio size: 2097152
[  208.352276] [drm] probing gen 2 caps for device 8086:1e10 = 1113c42/0
[  208.352279] [drm] probing mlw for device 8086:1e10 = 1113c42
[  208.352310] amdgpu 0000:01:00.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff
[  208.352334] ATOM BIOS: D00901
[  208.353290] amdgpu 0000:01:00.0: VRAM: 8192M 0x0000000000000000 - 0x00000001FFFFFFFF (8192M used)
[  208.353293] amdgpu 0000:01:00.0: GTT: 8192M 0x0000000200000000 - 0x00000003FFFFFFFF
[  208.353295] [drm] Detected VRAM RAM=8192M, BAR=256M
[  208.353297] [drm] RAM width 256bits GDDR5
[  208.353416] [TTM] Zone  kernel: Available graphics memory: 8163574 kiB
[  208.353420] [TTM] Zone   dma32: Available graphics memory: 2097152 kiB
[  208.353422] [TTM] Initializing pool allocator
[  208.353431] [TTM] Initializing DMA pool allocator
[  208.353463] [drm] amdgpu: 8192M of VRAM memory ready
[  208.353465] [drm] amdgpu: 8192M of GTT memory ready.
[  208.353484] [drm] GART: num cpu pages 2097152, num gpu pages 2097152
[  208.354734] [drm] PCIE GART of 8192M enabled (table at 0x0000000000040000).
[  208.354752] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[  208.354753] [drm] Driver supports precise vblank timestamp query.
[  208.354789] amdgpu 0000:01:00.0: amdgpu: using MSI.
[  208.354829] [drm] amdgpu: irq initialized.
[  208.354835] Can't find requested voltage id in vdd_dep_on_sclk table!
[  208.355092] amdgpu: powerplay initialized
[  208.355693] [drm] AMDGPU Display Connectors
[  208.355697] [drm] Connector 0:
[  208.355698] [drm]   DP-3
[  208.355699] [drm]   HPD6
[  208.355701] [drm]   DDC: 0x4868 0x4868 0x4869 0x4869 0x486a 0x486a 0x486b 0x486b
[  208.355702] [drm]   Encoders:
[  208.355704] [drm]     DFP1: INTERNAL_UNIPHY2
[  208.355705] [drm] Connector 1:
[  208.355706] [drm]   DP-4
[  208.355707] [drm]   HPD4
[  208.355709] [drm]   DDC: 0x4870 0x4870 0x4871 0x4871 0x4872 0x4872 0x4873 0x4873
[  208.355710] [drm]   Encoders:
[  208.355711] [drm]     DFP2: INTERNAL_UNIPHY2
[  208.355712] [drm] Connector 2:
[  208.355713] [drm]   DP-5
[  208.355714] [drm]   HPD1
[  208.355716] [drm]   DDC: 0x486c 0x486c 0x486d 0x486d 0x486e 0x486e 0x486f 0x486f
[  208.355717] [drm]   Encoders:
[  208.355718] [drm]     DFP3: INTERNAL_UNIPHY1
[  208.355719] [drm] Connector 3:
[  208.355720] [drm]   HDMI-A-3
[  208.355721] [drm]   HPD5
[  208.355723] [drm]   DDC: 0x4874 0x4874 0x4875 0x4875 0x4876 0x4876 0x4877 0x4877
[  208.355724] [drm]   Encoders:
[  208.355725] [drm]     DFP4: INTERNAL_UNIPHY1
[  208.360203] amdgpu 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000200000008, cpu addr 0xffff8800082e1008
[  208.360292] amdgpu 0000:01:00.0: fence driver on ring 1 use gpu addr 0x000000020000001c, cpu addr 0xffff8800082e101c
[  208.360384] amdgpu 0000:01:00.0: fence driver on ring 2 use gpu addr 0x0000000200000030, cpu addr 0xffff8800082e1030
[  208.360498] amdgpu 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000200000044, cpu addr 0xffff8800082e1044
[  208.360579] amdgpu 0000:01:00.0: fence driver on ring 4 use gpu addr 0x0000000200000058, cpu addr 0xffff8800082e1058
[  208.360623] amdgpu 0000:01:00.0: fence driver on ring 5 use gpu addr 0x000000020000006c, cpu addr 0xffff8800082e106c
[  208.360671] amdgpu 0000:01:00.0: fence driver on ring 6 use gpu addr 0x0000000200000080, cpu addr 0xffff8800082e1080
[  208.360736] amdgpu 0000:01:00.0: fence driver on ring 7 use gpu addr 0x0000000200000094, cpu addr 0xffff8800082e1094
[  208.360788] amdgpu 0000:01:00.0: fence driver on ring 8 use gpu addr 0x00000002000000a8, cpu addr 0xffff8800082e10a8
[  208.361366] amdgpu 0000:01:00.0: fence driver on ring 9 use gpu addr 0x00000002000000bc, cpu addr 0xffff8800082e10bc
[  208.361398] amdgpu 0000:01:00.0: fence driver on ring 10 use gpu addr 0x00000002000000d0, cpu addr 0xffff8800082e10d0
[  208.363562] [drm] Found UVD firmware Version: 1.79 Family ID: 16
[  208.364601] amdgpu 0000:01:00.0: fence driver on ring 11 use gpu addr 0x000000000109c420, cpu addr 0xffffc9000225a420
[  208.365655] [drm] Found VCE firmware Version: 52.4 Binary ID: 3
[  208.365889] amdgpu 0000:01:00.0: fence driver on ring 12 use gpu addr 0x00000002000000f8, cpu addr 0xffff8800082e10f8
[  208.365957] amdgpu 0000:01:00.0: fence driver on ring 13 use gpu addr 0x000000020000010c, cpu addr 0xffff8800082e110c
[  208.488937] [AVFS] Something is broken. See log!
[  208.511465] [drm] ring test on 0 succeeded in 9 usecs
[  208.511827] [drm] ring test on 1 succeeded in 25 usecs
[  208.511874] [drm] ring test on 2 succeeded in 14 usecs
[  208.511883] [drm] ring test on 3 succeeded in 2 usecs
[  208.511892] [drm] ring test on 4 succeeded in 2 usecs
[  208.511902] [drm] ring test on 5 succeeded in 2 usecs
[  208.511912] [drm] ring test on 6 succeeded in 2 usecs
[  208.511921] [drm] ring test on 7 succeeded in 2 usecs
[  208.511931] [drm] ring test on 8 succeeded in 2 usecs
[  208.512018] [drm] ring test on 9 succeeded in 10 usecs
[  208.512030] [drm] ring test on 10 succeeded in 11 usecs
[  208.538075] [drm] ring test on 11 succeeded in 1 usecs
[  208.538076] [drm] UVD initialized successfully.
[  208.648160] [drm] ring test on 12 succeeded in 6 usecs
[  208.648178] [drm] ring test on 13 succeeded in 4 usecs
[  208.648179] [drm] VCE initialized successfully.
[  209.192680] [drm] fb mappable at 0xE12A6000
[  209.192684] [drm] vram apper at 0xE0000000
[  209.192686] [drm] size 11059200
[  209.192687] [drm] fb depth is 24
[  209.192689] [drm]    pitch is 10240
[  209.192861] fbcon: amdgpudrmfb (fb0) is primary device
[  209.774960] Console: switching to colour frame buffer device 320x67
[  209.788697] amdgpu 0000:01:00.0: fb0: amdgpudrmfb frame buffer device
[  209.788970] [drm] ib test on ring 0 succeeded in 0 usecs
[  209.789196] [drm] ib test on ring 1 succeeded in 0 usecs
[  209.789272] [drm] ib test on ring 2 succeeded in 0 usecs
[  209.789349] [drm] ib test on ring 3 succeeded in 0 usecs
[  209.789426] [drm] ib test on ring 4 succeeded in 0 usecs
[  209.789503] [drm] ib test on ring 5 succeeded in 0 usecs
[  209.789580] [drm] ib test on ring 6 succeeded in 0 usecs
[  209.789657] [drm] ib test on ring 7 succeeded in 0 usecs
[  209.789693] [drm] ib test on ring 8 succeeded in 0 usecs
[  209.789722] [drm] ib test on ring 9 succeeded in 0 usecs
[  209.789747] [drm] ib test on ring 10 succeeded in 0 usecs
[  209.790694] [drm] ib test on ring 11 succeeded
[  209.790838] [drm] ib test on ring 12 succeeded
[  209.791825] [drm] Initialized amdgpu 3.2.0 20150101 for 0000:01:00.0 on minor 1