thermal thermal_zone0: failed to read out thermal zone

dmesg and lpci info attched in below post.
https://bugs.launchpad.net/ubuntu/+bug/1804577

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1804593/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1804593

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

More info in the bug reported early.
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1804591

Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.20 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.20-rc4

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/am...

dmesg of kernel 4.18.0-11-generic
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1804589/+attachment/5216936/+files/4.18.0-11-generic%20dmesg
dmesg of kernel 4.20.0-rc4-generic
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1804589/+attachment/5216937/+files/4.20-rc4%20dmesg

If you need those newer vega firmware for your hardware you need to update linux-firmware. Best would be to get the src deb from debian sid or Ubuntu development (19.04) repo and recompile it on your system. I have not checked if it was backported.