Versions: Kernel 4.17.8, LLVM 6.0.1, Mesa 18.1.4, XOrg 1.20.0.
Distro: Arch.
Connected display devices should be detected even if they are powered off, =
as
long as they're still physically connected obviously.
This works fine when using amdgpu.dc=3D0 but if the kernel is booted with
amdgpu.dc=3D1 then the display device simply isn't seen (at all) if it's po=
wered
off. It does get detected immediately when powered on, but power it back off
again and it completely disappears as though it's not even connected anymor=
e.
Kernel DRM output with dc=3D1 (default):
[drm] amdgpu kernel modesetting enabled.
fb: switching to amdgpudrmfb from EFI VGA
[drm] initializing kernel modesetting (POLARIS10 0x1002:0x67DF
0x1DA2:0xE366 0xE7).
[drm] register mmio base: 0xDC200000
[drm] register mmio size: 262144
[drm] probing gen 2 caps for device 8086:1901 =3D 261ad03/e
[drm] probing mlw for device 8086:1901 =3D 261ad03
[drm] add ip block number 0 <vi_common>
[drm] add ip block number 1 <gmc_v8_0>
[drm] add ip block number 2 <tonga_ih>
[drm] add ip block number 3 <powerplay>
[drm] add ip block number 4 <dm>
[drm] add ip block number 5 <gfx_v8_0>
[drm] add ip block number 6 <sdma_v3_0>
[drm] add ip block number 7 <uvd_v6_0>
[drm] add ip block number 8 <vce_v3_0>
[drm] UVD is enabled in VM mode
[drm] UVD ENC is enabled in VM mode
[drm] VCE enabled in VM mode
[drm] vm size is 64 GB, 2 levels, block size is 10-bit, fragment si=
ze
is 9-bit
[drm] Detected VRAM RAM=3D8192M, BAR=3D8192M
[drm] RAM width 256bits GDDR5
[drm] amdgpu: 8192M of VRAM memory ready
[drm] amdgpu: 8192M of GTT memory ready.
[drm] GART: num cpu pages 65536, num gpu pages 65536
[drm] PCIE GART of 256M enabled (table at 0x000000F400040000).
[drm] Chained IB support enabled!
[drm] Found UVD firmware Version: 1.130 Family ID: 16
[drm] Found VCE firmware Version: 53.26 Binary ID: 3
[drm] DM_PPLIB: values for Engine clock
[drm] DM_PPLIB: 30000
[drm] DM_PPLIB: 75100
[drm] DM_PPLIB: 104800
[drm] DM_PPLIB: 115800
[drm] DM_PPLIB: 124000
[drm] DM_PPLIB: 130900
[drm] DM_PPLIB: 136400
[drm] DM_PPLIB: 143000
[drm] DM_PPLIB: Validation clocks:
[drm] DM_PPLIB: engine_max_clock: 143000
[drm] DM_PPLIB: memory_max_clock: 210000
[drm] DM_PPLIB: level : 0
[drm] DM_PPLIB: values for Memory clock
[drm] DM_PPLIB: 30000
[drm] DM_PPLIB: 100000
[drm] DM_PPLIB: 210000
[drm] DM_PPLIB: Validation clocks:
[drm] DM_PPLIB: engine_max_clock: 143000
[drm] DM_PPLIB: memory_max_clock: 210000
[drm] DM_PPLIB: level : 0
[drm] Display Core initialized with v3.1.38!
[drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[drm] Driver supports precise vblank timestamp query.
[drm] UVD and UVD ENC initialized successfully.
[drm] VCE initialized successfully.
[drm] Unsupported device. GVT-g is disabled
[drm] Replacing VGA console driver
[drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[drm] Driver supports precise vblank timestamp query.
[drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4)
[drm] Cannot find any crtc or sizes
[drm] Initialized amdgpu 3.25.0 20150101 for 0000:01:00.0 on minor 0
[drm] Initialized i915 1.6.0 20180308 for 0000:00:02.0 on minor 1
[drm] Cannot find any crtc or sizes
[drm] Cannot find any crtc or sizes
[drm] Cannot find any crtc or sizes
Kernel DRM output with dc=3D0:
[drm] amdgpu kernel modesetting enabled.
fb: switching to amdgpudrmfb from EFI VGA
[drm] initializing kernel modesetting (POLARIS10 0x1002:0x67DF
0x1DA2:0xE366 0xE7).
[drm] register mmio base: 0xDC200000
[drm] register mmio size: 262144
[drm] probing gen 2 caps for device 8086:1901 =3D 261ad03/e
[drm] probing mlw for device 8086:1901 =3D 261ad03
[drm] add ip block number 0 <vi_common>
[drm] add ip block number 1 <gmc_v8_0>
[drm] add ip block number 2 <tonga_ih>
[drm] add ip block number 3 <powerplay>
[drm] add ip block number 4 <dce_v11_0>
[drm] add ip block number 5 <gfx_v8_0>
[drm] add ip block number 6 <sdma_v3_0>
[drm] add ip block number 7 <uvd_v6_0>
[drm] add ip block number 8 <vce_v3_0>
[drm] UVD is enabled in VM mode
[drm] UVD ENC is enabled in VM mode
[drm] VCE enabled in VM mode
[drm] vm size is 64 GB, 2 levels, block size is 10-bit, fragment si=
ze
is 9-bit
[drm] Detected VRAM RAM=3D8192M, BAR=3D8192M
[drm] RAM width 256bits GDDR5
[drm] amdgpu: 8192M of VRAM memory ready
[drm] amdgpu: 8192M of GTT memory ready.
[drm] GART: num cpu pages 65536, num gpu pages 65536
[drm] PCIE GART of 256M enabled (table at 0x000000F400040000).
[drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[drm] Driver supports precise vblank timestamp query.
[drm] AMDGPU Display Connectors
[drm] Connector 0:
[drm] DP-1
[drm] HPD6
[drm] DDC: 0x4868 0x4868 0x4869 0x4869 0x486a 0x486a 0x486b 0x486b
[drm] Encoders:
[drm] DFP1: INTERNAL_UNIPHY2
[drm] Connector 1:
[drm] DP-2
[drm] HPD4
[drm] DDC: 0x4870 0x4870 0x4871 0x4871 0x4872 0x4872 0x4873 0x4873
[drm] Encoders:
[drm] DFP2: INTERNAL_UNIPHY2
[drm] Connector 2:
[drm] HDMI-A-1
[drm] HPD1
[drm] DDC: 0x486c 0x486c 0x486d 0x486d 0x486e 0x486e 0x486f 0x486f
[drm] Encoders:
[drm] DFP3: INTERNAL_UNIPHY1
[drm] Connector 3:
[drm] HDMI-A-2
[drm] HPD5
[drm] DDC: 0x4874 0x4874 0x4875 0x4875 0x4876 0x4876 0x4877 0x4877
[drm] Encoders:
[drm] DFP4: INTERNAL_UNIPHY1
[drm] Connector 4:
[drm] DVI-D-1
[drm] HPD3
[drm] DDC: 0x487c 0x487c 0x487d 0x487d 0x487e 0x487e 0x487f 0x487f
[drm] Encoders:
[drm] DFP5: INTERNAL_UNIPHY
[drm] Chained IB support enabled!
[drm] Found UVD firmware Version: 1.130 Family ID: 16
[drm] Found VCE firmware Version: 53.26 Binary ID: 3
[drm] UVD and UVD ENC initialized successfully.
[drm] VCE initialized successfully.
[drm] Replacing VGA console driver
[drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[drm] Driver supports precise vblank timestamp query.
[drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4)
[drm] fb mappable at 0x2000568000
[drm] vram apper at 0x2000000000
[drm] size 8294400
[drm] fb depth is 24
[drm] pitch is 7680
fbcon: amdgpudrmfb (fb0) is primary device
amdgpu 0000:01:00.0: fb0: amdgpudrmfb frame buffer device
[drm] Initialized amdgpu 3.25.0 20150101 for 0000:01:00.0 on minor 0
[drm] Initialized i915 1.6.0 20180308 for 0000:00:02.0 on minor 1
[drm] Cannot find any crtc or sizes
[drm] Cannot find any crtc or sizes
[drm] Cannot find any crtc or sizes
And the resulting xrandr outputs:
dc=3D1 (default)
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 16384 x 16=
384
DisplayPort-0 disconnected primary (normal left inverted right x ax=
is y
axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axi=
s)
HDMI-A-0 disconnected (normal left inverted right x axis y axis)
HDMI-A-1 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)
dc=3D0 (forced)
HDMI-A-0 connected 1920x1080+0+0 (normal left inverted right x axis=
y
axis) 0mm x 0mm
1920x1080 60.00*+ 50.00 59.94 30.00 25.00 24.00=
=20=20=20
29.97 23.98=20=20
1920x1080i 60.00 50.00 59.94=20=20
1600x1200 60.00=20=20
1280x1024 75.02 60.02=20=20
1440x900 59.90=20=20
1280x800 119.91 59.91=20=20
1152x864 75.00=20=20
1280x720 60.00 50.00 59.94=20=20
1024x768 119.99 75.03 70.07 60.00=20=20
832x624 74.55=20=20
800x600 72.19 75.00 60.32=20=20
720x576 50.00=20=20
720x576i 50.00=20=20
720x480 60.00 59.94=20=20
720x480i 60.00 59.94=20=20
640x480 75.00 72.81 66.67 60.00 59.94=20=20
720x400 70.08=20
Let me know if there's anything else you need here.