Kubuntu 16.10: Radeon error atombios stuck in loop

Problem

During boot of Kubuntu-16.10 these error message appear on screen:

[drm:atom_op_jump [radeon]] *ERROR* atombios stuck in loop for more than 5secs aborting
[drm:atom_execute_table_locked [radeon]] *ERROR* atombios stuck executing 72E0 (len 237, WS 0, PS 4) @ 0x72EE
[drm:atom_execute_table_locked [radeon]] *ERROR* atombios stuck executing 6C78 (len 74, WS 0, PS 8) @ 0x6CAD

Environment

• Lenovo ThinkPad S540
• Graphics Card AMD Radeon HD 8670M
• Kubuntu 16.10

$ lspci | grep -E 'VGA|Display'
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 09)
06:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Sun XT [Radeon HD 8670A/8670M/8690M / R5 M330]

Solution

Remove the `radeon' driver, so the only driver loaded is the `amdgpu' driver. See https://wiki.archlinux.org/index.php/AMDGPU#Disable_radeon_driver :

$ cat /etc/modprobe.d/radeon.conf 
# https://wiki.archlinux.org/index.php/AMDGPU -- FVu, Feb 19, 2017
blacklist radeon

Now only this graphics driver is present in my X configuration:

$ cat /usr/share/X11/xorg.conf.d/10-amdgpu.conf 
Section "OutputClass"
        Identifier "AMDgpu"
        MatchDriver "amdgpu"
        Driver "amdgpu"
EndSection

Journal

20170219

Tried to install the AMDGPU-PRO driver by following instructions from http://support.amd.com/en-us/kb-articles/Pages/AMDGPU-PRO-Install.aspx. But after reboot and selecting GRUB entry the screen remained black. Fortunately I was able to do:

amdgpu-pro-uninstall