Comme=
nt # 20
on bug 10588=
0
from Pont=
us Gr=C3=A5sk=C3=A6g
I got to here from the bug detailed in Ubuntu Launchpad -
ht=
tps://bugs.launchpad.net/ubuntu/+source/linux/+bug/1761751
It looks like amdgpu code does not support VGA on Kaveri, either.
I have a Lenovo Z50-75 laptop with AMD A10-7300, (Kaveri gpu)
information extracted from #lshw when booted with amdgpu.dc=3D0 [some infor=
mation
purposefully withheld]
description: Notebook
product: 80EC (LENOVO_MT_80EC0_BU_idea_FM_Lenovo Z50-75)
vendor: LENOVO
version: Lenovo Z50-75
serial: XXX
width: 64 bits
capabilities: smbios-2.7 dmi-2.7 vsyscall32
configuration: boot=3Dnormal chassis=3Dnotebook family=3DIDEAPAD
sku=3DLENOVO_MT_80EC0_BU_idea_FM_Lenovo Z50-75 uuid=3DXXX
*-core
description: Motherboard
product: Lancer 5B3
vendor: LENOVO
physical id: 0
version: XXX
serial: XXX
slot: Chassis Location Unknown
*-firmware
description: BIOS
vendor: LENOVO
physical id: 0
version: A4CN40WW (V 2.09)
date: 08/24/2015
size: 128KiB
capacity: 8128KiB
capabilities: pci upgrade shadowing cdboot bootselect edd
int5printscreen int9keyboard int14serial int17printer int10video pc98 acpi =
usb
biosbootspecification netboot
*-cpu
description: CPU
product: AMD A10-7300 Radeon R6, 10 Compute Cores 4C+6G
vendor: Advanced Micro Devices [AMD]
physical id: 2c
bus info: cpu@0
version: AMD A10-7300 Radeon R6, 10 Compute Cores 4C+6G
slot: Socket FS1r2
size: 1227MHz
capacity: 1900MHz
width: 64 bits
clock: 100MHz
*-cache:1
description: L2 cache
physical id: 2e
slot: L2 Cache
size: 4MiB
capacity: 4MiB
clock: 1GHz (1.0ns)
capabilities: pipeline-burst internal write-back unified
configuration: level=3D2
...
*-pci:0
description: Host bridge
product: Family 15h (Models 30h-3fh) Processor Root Complex
vendor: Advanced Micro Devices, Inc. [AMD]
physical id: 100
bus info: pci@0000:00:00.0
version: 00
width: 32 bits
clock: 33MHz
*-display
description: VGA compatible controller
product: Kaveri [Radeon R6 Graphics]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 1
bus info: pci@0000:00:01.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_=
list
rom
configuration: driver=3Damdgpu latency=3D0
resources: irq:35 memory:e0000000-efffffff
memory:f0000000-f07fffff ioport:2000(size=3D256) memory:f0b00000-f0b3ffff
memory:c0000-dffff
...
information extracted from #cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 21
model : 48
model name : AMD A10-7300 Radeon R6, 10 Compute Cores 4C+6G
...
It has a VGA output as well as HDMI and internal screen.
When booted with kernel parameters amdgpu.cik_support=3D1 amdgu.dc=3D1, the=
VGA
port does not work.
The dmesg output when booted with amdgpu=3D1 contains error messages of the=
form:
[drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from
Adapter Service for connector index:3! type 0 expected 3
in context
[drm] radeon kernel modesetting enabled.
fb: switching to radeondrmfb from EFI VGA
[drm] amdgpu kernel modesetting enabled.
[drm] initializing kernel modesetting (KAVERI 0x1002:0x130A 0x17AA:0x3988
0x00).
[drm] register mmio base: 0xF0B00000
[drm] register mmio size: 262144
[drm] BIOS signature incorrect 0 0
[drm] vm size is 64 GB, 2 levels, block size is 10-bit, fragment size is 9-=
bit
[drm] Detected VRAM RAM=3D1024M, BAR=3D1024M
[drm] RAM width 64bits UNKNOWN
[drm] amdgpu: 1024M of VRAM memory ready
[drm] amdgpu: 3072M of GTT memory ready.
[drm] GART: num cpu pages 262144, num gpu pages 262144
[drm] PCIE GART of 1024M enabled (table at 0x000000F400040000).
[drm] Internal thermal controller without fan control
[drm] amdgpu: dpm initialized
[drm] Found UVD firmware Version: 1.55 Family ID: 9
[drm] Found VCE firmware Version: 50.10 Binary ID: 2
[drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from
Adapter Service for connector index:3! type 0 expected 3
[amdgpu]] *ERROR* construct: Invalid Connector ObjectID from Adapter Service
for connector index:4! type 0 expected 3
[drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from
Adapter Service for connector index:5! type 0 expected 3
[drm:construct [amdgpu]] *ERROR* construct: Invalid Connector ObjectID from
Adapter Service for connector index:6! type 0 expected 3
[drm] Display Core initialized with v3.1.27!
[drm] SADs count is: -2, don't need to read it
[drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[drm] Driver supports precise vblank timestamp query.
[drm] UVD initialized successfully.
[drm] VCE initialized successfully.
[drm] fb mappable at 0xA042A000
[drm] vram apper at 0xA0000000
[drm] size 8294400
[drm] fb depth is 24
[drm] pitch is 7680
fbcon: amdgpudrmfb (fb0) is primary device
amdgpu 0000:00:01.0: fb0: amdgpudrmfb frame buffer device
[drm] Initialized amdgpu 3.23.0 20150101 for 0000:00:01.0 on minor 0
The VGA port works when booted with kernel parameters amdgpu.cik_support=3D1
amdgpu.dc=3D0
graaskaeg