The issue remains with mainline kernel v4.20-rc4, here is the warnings during 
the installation. kgd2kfd_probe failed error seems gone with the new kernel.
Processing triggers for linux-image-unsigned-4.20.0-042000rc4-generic 
(4.20.0-042000rc4.201811252331) ...
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-4.20.0-042000rc4-generic
cryptsetup: WARNING: The initramfs image may not contain cryptsetup binaries
    nor crypto modules. If that's on purpose, you may want to uninstall the
    'cryptsetup-initramfs' package in order to disable the cryptsetup initramfs
    integration and avoid this warning.
W: Possible missing firmware /lib/firmware/amdgpu/raven2_gpu_info.bin for 
module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/picasso_gpu_info.bin for 
module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_gpu_info.bin for 
module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_asd.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_sos.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven2_asd.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/picasso_asd.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega20_sos.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven2_rlc.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven2_mec2.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven2_mec.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven2_me.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven2_pfp.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven2_ce.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/picasso_rlc.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/picasso_mec2.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/picasso_mec.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/picasso_me.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/picasso_pfp.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/picasso_ce.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega20_rlc.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega20_mec2.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega20_mec.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega20_me.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega20_pfp.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega20_ce.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_rlc.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_mec2.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_mec.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_me.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_pfp.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_ce.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven2_sdma.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/picasso_sdma.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega20_sdma1.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega20_sdma.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_sdma1.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_sdma.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega20_uvd.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_uvd.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega20_vce.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_vce.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven2_vcn.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/picasso_vcn.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega20_smc.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/vega12_smc.bin for module 
amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/raven_dmcu.bin for module 
amdgpu
/etc/kernel/postinst.d/zz-update-grub:
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.20.0-042000rc4-generic
Found initrd image: /boot/initrd.img-4.20.0-042000rc4-generic
Found linux image: /boot/vmlinuz-4.18.0-11-generic
Found initrd image: /boot/initrd.img-4.18.0-11-generic
Found linux image: /boot/vmlinuz-4.18.0-10-generic
Found initrd image: /boot/initrd.img-4.18.0-10-generic
Found Windows Boot Manager on /dev/nvme0n1p1@/EFI/Microsoft/Boot/bootmgfw.efi
Adding boot menu entry for EFI firmware configuration
done

After installing the 4.20-rc4 mainline kernel, I got errors and warnings
like this in the dmesg.

[ 0.044081] ACPI BIOS Error (bug): Failure creating [\_SB.SMIC], 
AE_ALREADY_EXISTS (20181003/dswload2-316)
[ 0.044089] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181003/psobject-221)
[ 0.044094] ACPI BIOS Error (bug): Failure creating [\_SB.SMIB], 
AE_ALREADY_EXISTS (20181003/dsfield-626)

[ 9.399133] iwlwifi 0000:1c:00.0: Direct firmware load for 
iwlwifi-9260-th-b0-jf-b0-41.ucode failed with error -2
[ 9.399148] iwlwifi 0000:1c:00.0: Direct firmware load for 
iwlwifi-9260-th-b0-jf-b0-40.ucode failed with error -2
[ 9.399285] iwlwifi 0000:1c:00.0: Direct firmware load for 
iwlwifi-9260-th-b0-jf-b0-39.ucode failed with error -2

[ 0.044081] ACPI BIOS Error (bug): Failure creating [\_SB.SMIC], 
AE_ALREADY_EXISTS (20181003/dswload2-316)
[ 0.044089] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181003/psobject-221)
[ 0.044094] ACPI BIOS Error (bug): Failure creating [\_SB.SMIB], 
AE_ALREADY_EXISTS (20181003/dsfield-626)

[ 9.593661] thermal thermal_zone0: failed to read out thermal zone (-61)

[ 0.000000] tsc: Fast TSC calibration failed

[ 9.587762] EDAC amd64: Node 0: DRAM ECC disabled.
[ 9.587763] EDAC amd64: ECC disabled in the BIOS or no ECC capability, module 
will not load.
                Either enable ECC checking or force module loading by setting 
'ecc_enable_override'.
                (Note that use of the override may cause unknown side effects.)
[ 9.593254] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
[ 9.593661] thermal thermal_zone0: failed to read out thermal zone (-61)
[ 9.595426] iwlwifi 0000:1c:00.0 wlp28s0: renamed from wlan0
[ 9.668431] EDAC amd64: Node 0: DRAM ECC disabled.
[ 9.668433] EDAC amd64: ECC disabled in the BIOS or no ECC capability, module 
will not load.
                Either enable ECC checking or force module loading by setting 
'ecc_enable_override'.
                (Note that use of the override may cause unknown side effects.)

[ 0.870238] usb usb2: We don't know the algorithms for LPM for this host, 
disabling LPM.
[ 0.870249] usb usb2: New USB device found, idVendor=1d6b, idProduct=0003, 
bcdDevice= 4.20
[ 0.870250] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 0.870251] usb usb2: Product: xHCI Host Controller
[ 0.870252] usb usb2: Manufacturer: Linux 4.20.0-042000rc4-generic xhci-hcd
[ 0.870252] usb usb2: SerialNumber: 0000:15:00.0

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

** Tags added: kernel-bug-exists-upstream

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https://bugs.launchpad.net/bugs/1804591

Title:
  tsc: Fast TSC calibration failed

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  [    0.000000] APIC: Switch to symmetric I/O mode setup
  [    0.004000] Switched APIC routing to physical flat.
  [    0.004000] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
  [    0.024000] tsc: Fast TSC calibration failed
  [    0.032000] tsc: PIT calibration matches HPET. 1 loops
  [    0.032000] tsc: Detected 3600.039 MHz processor
  [    0.032000] clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 
0x33e47874cac, max_idle_ns: 440795311274 ns
  [    0.032000] Calibrating delay loop (skipped), value calculated using timer 
frequency.. 7200.07 BogoMIPS (lpj=14400156)
  [    0.032000] pid_max: default: 32768 minimum: 301
  [    0.032000] Security Framework initialized
  [    0.032000] Yama: becoming mindful.
  [    0.032000] AppArmor: AppArmor initialized
  ---
  ProblemType: Bug
  ApportVersion: 2.20.10-0ubuntu13.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:     1438 F.... pulseaudio
   /dev/snd/controlC0:     1438 F.... pulseaudio
  CurrentDesktop: LXQt
  DistroRelease: Ubuntu 18.10
  InstallationDate: Installed on 2018-11-22 (2 days ago)
  InstallationMedia: Lubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 
(20181017.2)
  MachineType: Micro-Star International Co., Ltd. MS-7A39
  Package: linux (not installed)
  ProcFB: 0 amdgpudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-11-generic root=UUID=x ro 
quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
  RelatedPackageVersions:
   linux-restricted-modules-4.18.0-11-generic N/A
   linux-backports-modules-4.18.0-11-generic  N/A
   linux-firmware                             1.175.1
  Tags:  cosmic
  Uname: Linux 4.18.0-11-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sudo
  _MarkForUpload: True
  dmi.bios.date: 09/28/2018
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2.I0
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: B350M GAMING PRO (MS-7A39)
  dmi.board.vendor: Micro-Star International Co., Ltd.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To be filled by O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Micro-Star International Co., Ltd.
  dmi.chassis.version: 1.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr2.I0:bd09/28/2018:svnMicro-StarInternationalCo.,Ltd.:pnMS-7A39:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnB350MGAMINGPRO(MS-7A39):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: MS-7A39
  dmi.product.sku: To be filled by O.E.M.
  dmi.product.version: 1.0
  dmi.sys.vendor: Micro-Star International Co., Ltd.

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