The last MESA updates (02/07/19) corrupted output to DisplayLink

[cement_head]

Prior to Thursday's "update" from Bionic-Proposed, the MESA was working fine; afterwards, gameplay on STEAM has become choppy and staccato; secondary display via a USB-C through DisplayPort UD3900 (Pluggable) is completely corrupted. See attached picture.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7.1
ProcVersionSignature: Ubuntu 4.18.0-15.16~18.04.1-generic 4.18.20
Uname: Linux 4.18.0-15-generic x86_64
.tmp.unity_support_test.0:

ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity:Unity7:ubuntu
Date: Mon Feb 11 16:50:58 2019
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
DkmsStatus:
 acpi-call, 1.1.0, 4.18.0-15-generic, x86_64: installedError! Could not locate dkms.conf file.
 File: does not exist.
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation Device [8086:3ea0] (prog-if 00 [VGA controller])
   Subsystem: CLEVO/KAPOK Computer Device [1558:1323]
InstallationDate: Installed on 2019-01-15 (27 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
MachineType: System76 Galago Pro
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.18.0-15-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=1
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/05/2018
dmi.bios.vendor: INSYDE Corp.
dmi.bios.version: 1.07.03
dmi.board.asset.tag: Tag 12345
dmi.board.name: Galago Pro
dmi.board.vendor: System76
dmi.board.version: galp3-c
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: System76
dmi.chassis.version: galp3-c
dmi.modalias: dmi:bvnINSYDECorp.:bvr1.07.03:bd12/05/2018:svnSystem76:pnGalagoPro:pvrgalp3-c:rvnSystem76:rnGalagoPro:rvrgalp3-c:cvnSystem76:ct10:cvrgalp3-c:
dmi.product.family: Not Applicable
dmi.product.name: Galago Pro
dmi.product.sku: Not Applicable
dmi.product.version: galp3-c
dmi.sys.vendor: System76
version.compiz: compiz 1:0.9.13.1+18.04.20180302-0ubuntu1
version.libdrm2: libdrm2 2.4.95-1~18.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 18.2.8-0ubuntu0~18.04.2
version.libgl1-mesa-glx: libgl1-mesa-glx 18.2.8-0ubuntu0~18.04.2
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

[Timo Aaltonen (tjaalton)]

You mean it worked with mesa 18.2.2? Try with an older kernel too

[cement_head (andorjkiss)]

Yeah, I removed the older kernels during a clean-up. How do I re-install one back?

[cement_head (andorjkiss)]

When I install an older kernel, do DKMS modules need to be rebuilt, or do DKMS modules only need to built for newer kernels?

[cement_head (andorjkiss)]

Not sure what happened, but I tried installing the HWE kernel, even those it's not entirely ready, but it did install the new video drivers and that solved it.

[Timo Aaltonen (tjaalton)]

Are you still able to reproduce it with the stock bionic kernel? If yes, it's still a bug

[cement_head (andorjkiss)]

Sorry. No, running the stock kernel now & no bug. Running the stock kernel and this video driver

$ sudo dpkg -l |grep xserver-xorg-core
ii xserver-xorg-core-hwe-18.04 2:1.20.1-3ubuntu2.1~18.04.1 amd64 Xorg X server - core server

$ uname -a
Linux XXXX-XXXXXX 4.18.0-15-generic #16~18.04.1-Ubuntu SMP Thu Feb 7 14:06:04 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

[Timo Aaltonen (tjaalton)]

that's the HWE kernel, not 4.15

[cement_head (andorjkiss)]

Okay, my mistake...

[Launchpad Janitor (janitor)]

[Expired for mesa (Ubuntu) because there has been no activity for 60 days.]