Please verify you are using the 7.10 radeon driver by issuing the following commands:
lshw -c video
modinfo radeon | more
If you see the following in the lshw/modinfo output, you are using the radeon driver:
Example of 1st lines of lshw:
*-display
description: VGA compatible controller
product: RV516/M64-S [Mobility Radeon X2300] **or some other radeon card**
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:01:00.0
version: 00
width: 32 bits
clock: 33MHz
capabilities: vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0
Example 1st lines of modinfo (kernel version may be different):
filename: /lib/modules/4.13.0-26-generic/kernel/drivers/gpu/drm/radeon/radeon.ko
license: GPL and additional rights
description: ATI Radeon
Verify that you are using the radeon driver.
If so, verify the version of xserver-xorg-video-radeon-hwe-16.04
you are using. Execute:
sudo apt list --installed | grep radeon-hwe
The following should be displayed:
xserver-xorg-video-radeon-hwe-16.04/xenial-updates,now 1:7.10.0-0ubuntu1~16.04.1 amd64 [installed]
This is the 7.10 radeon driver.
If all of the above is true for your machine, then this issue has a workaround:
Download the 7.9 radeon driver Ubuntu package (xserver-xorg-video-radeon-hwe-16.04_7.9.0-0ubuntu1~16.04.1_amd64.deb
) from:
https://launchpad.net/ubuntu/xenial/amd64/xserver-xorg-video-radeon-hwe-16.04/1:7.9.0-0ubuntu1~16.04.1
Execute the following commands on the downloaded .deb file:
sudo dpkg -i xserver-xorg-video-radeon-hwe-16.04_7.9.0-0ubuntu1_16.04.1_amd64.deb
sudo apt-get -f install
sudo apt-mark hold xserver-xorg-video-radeon-hwe-16.04
This downgrades the radeon driver package to version 7.9, fixes dependencies, and holds the driver pkg from further updates.
Upon reboot, issue should be resolved.
A bug has been reported to Freedesktop at:
https://bugs.freedesktop.org/show_bug.cgi?id=105217
The 7.9 radeon driver will need to stay held until the issue is fixed in:
xserver-xorg-video-radeon-hwe-16.04
I believe this issue to be a duplicate of:
Blank screen with only mouse pointer after 7.10 radeon driver update; display does not switch to tty7 upon lightdm start; Xorg.0.log quickly grows