[Bug 105569] sw_init of IP block <gmc_v6_0> failed -2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105569

            Bug ID: 105569
           Summary: sw_init of IP block <gmc_v6_0> failed -2
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: wraithofcthulhu at gmail.com

I have next issue, when trying to load Ubuntu 18.04b1 with kernels up to
4.16rc5
My computer has hybrid AMD graphics and kernels loaded with parameters
"radeon.si_support=0 radeon.cik_support=0 amdgpu.si_support=1
amdgpu.cik_support=1".

lspci -k:
#########################################################################
00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Richland [Radeon HD 8510G]
        Subsystem: ASUSTeK Computer Inc. Richland [Radeon HD 8510G]
        Kernel driver in use: radeon
        Kernel modules: radeon
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Mars
[Radeon HD 8730M]
        Subsystem: ASUSTeK Computer Inc. Mars [Radeon HD 8730M]
        Kernel modules: radeon, amdgpu

dmesg section with error:
#########################################################################
[  592.249652] [drm] amdgpu kernel modesetting enabled.
[  592.249692] vga_switcheroo: detected switching method \_SB_.PCI0.VGA_.ATPX
handle
[  592.249986] ATPX version 1, functions 0x00000003
[  592.250795] [drm] initializing kernel modesetting (OLAND 0x1002:0x6601
0x1043:0x2134 0x00).
[  592.251291] [drm] register mmio base: 0xFEA00000
[  592.251293] [drm] register mmio size: 262144
[  592.251303] vga_switcheroo: enabled
[  592.547558] ATOM BIOS: BR43789.002
[  592.549043] [drm] vm size is 64 GB, 2 levels, block size is 10-bit, fragment
size is 9-bit
[  592.579114] amdgpu 0000:01:00.0: Direct firmware load for
radeon/oland_mc.bin failed with error -2
[  592.579124] amdgpu 0000:01:00.0: si_mc: Failed to load firmware
"radeon/oland_mc.bin"
[  592.579133] amdgpu 0000:01:00.0: Failed to load mc firmware!
[  592.579305] [drm:amdgpu_device_init [amdgpu]] *ERROR* sw_init of IP block
<gmc_v6_0> failed -2
[  592.579311] amdgpu 0000:01:00.0: amdgpu_device_ip_init failed
[  592.579320] amdgpu 0000:01:00.0: Fatal error during GPU init
[  592.579327] [drm] amdgpu: finishing device.
[  592.580752] vga_switcheroo: disabled
[  592.581246] amdgpu: probe of 0000:01:00.0 failed with error -2

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