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the kernels after 4.15.0-55-generic give this error in sys.log:
Sep 20 18:56:09 curt-desktop kernel: [ 1.783787] amdgpu 0000:01:00.0: Direct
firmware load for amdgpu/polaris11_k_mc.bin failed with error -2
Sep 20 18:56:09 curt-desktop kernel: [ 1.783788] mc: Failed to load firmware
"amdgpu/polaris11_k_mc.bin"
Sep 20 18:56:09 curt-desktop kernel: [ 1.783843] [drm:gmc_v8_0_sw_init
[amdgpu]] *ERROR* Failed to load mc firmware!
Sep 20 18:56:09 curt-desktop kernel: [ 1.783883] [drm:amdgpu_device_init
[amdgpu]] *ERROR* sw_init of IP block <gmc_v8_0> failed -2
Sep 20 18:56:09 curt-desktop kernel: [ 1.783885] amdgpu 0000:01:00.0:
amdgpu_init failed
Sep 20 18:56:09 curt-desktop kernel: [ 1.783887] amdgpu 0000:01:00.0: Fatal
error during GPU init
Sep 20 18:56:09 curt-desktop kernel: [ 1.783888] [drm] amdgpu: finishing
device.
Sep 20 18:56:09 curt-desktop kernel: [ 1.783889] [TTM] Memory type 2 has not
been initialized
Sep 20 18:56:09 curt-desktop kernel: [ 1.784033] amdgpu: probe of
0000:01:00.0 failed with error -2
so amdgpu isn't working after that kernel, thus it uses VESA for video.
So I have no dual monitors any more.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.15.0-64-generic 4.15.0-64.73~16.04.1
ProcVersionSignature: Ubuntu 4.15.0-64.73~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-64-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.19
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Sep 20 20:47:30 2019
InstallationDate: Installed on 2018-09-01 (385 days ago)
InstallationMedia: Ubuntu 16.04.5 LTS "Xenial Xerus" - Release amd64 (20180731)
SourcePackage: linux-signed-hwe
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-firmware (Ubuntu)
Importance: Undecided
Status: Fix Released
** Tags: amd64 apport-bug xenial
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System isn't using amdgpu so its defaulting to vesa driver.
https://bugs.launchpad.net/bugs/1844847
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