Comment # 20
on bug 105880
from Pontus Gråskæg
I got to here from the bug detailed in Ubuntu Launchpad - https://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=0 [some information 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=normal chassis=notebook family=IDEAPAD sku=LENOVO_MT_80EC0_BU_idea_FM_Lenovo Z50-75 uuid=XXX *-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=2 ... *-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=amdgpu latency=0 resources: irq:35 memory:e0000000-efffffff memory:f0000000-f07fffff ioport:2000(size=256) 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=1 amdgu.dc=1, the VGA port does not work. The dmesg output when booted with amdgpu=1 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=1024M, BAR=1024M [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=1 amdgpu.dc=0 graaskaeg
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