7 月上半月的一次更新导致我的 Ubuntu 16.04 安装在通过扩展坞连接到戴尔显示器时显示伪影。这些伪影同时显示在戴尔显示器和笔记本电脑的显示屏上，而戴尔显示器未连接时则不会出现。您建议如何查找导致此问题的更新并将其恢复？
一些与问题本身相关的信息（问题是关于对“坏”更新进行二分法，但也许有人可以直接找到解决问题的方法）：
从 01.org 更新英特尔的显示驱动程序没有帮助。
还值得一提的是，使用 HDMI 连接到同一底座的另一台飞利浦显示器不会发生这种情况。使用 HDMI 连接戴尔显示器并不能解决问题。
设置：
- 联想 Yoga 720-13IKB
- 显卡：英特尔公司 UHD Graphics 620（rev 07）
- 通过 USB-C 连接至华硕 SIMPRO 基座
- Dell P2317HI 显示器通过 DisplayPort/HDMI 连接至扩展坞
展示文物的视频（前 20 秒）： https://streamable.com/vpr6b
最近的更新历史来自/var/log/apt/history.log：
Start-Date: 2018-07-07 19:06:54
Commandline: aptdaemon role='role-commit-packages' sender=':1.385'
Install: libllvm6.0:amd64 (1:6.0-1ubuntu2~16.04.1, automatic)
Upgrade: libsoup-gnome2.4-1:amd64 (2.52.2-1ubuntu0.2, 2.52.2-1ubuntu0.3), libdrm-nouveau2:amd64 (2.4.83-1~16.04.1, 2.4.91-2~16.04.1), linux-libc-dev:amd64 (4.4.0-128.154, 4.4.0-130.156), gir1.2-soup-2.4:amd64 (2.52.2-1ubuntu0.2, 2.52.2-1ubuntu0.3), libapt-inst2.0:amd64 (1.2.26, 1.2.27), update-notifier-common:amd64 (3.168.8, 3.168.9), libarchive-zip-perl:amd64 (1.56-2, 1.56-2ubuntu0.1), apt:amd64 (1.2.26, 1.2.27), libglapi-mesa:amd64 (17.2.8-0ubuntu0~16.04.1, 18.0.5-0ubuntu0~16.04.1), xserver-xorg-video-amdgpu-hwe-16.04:amd64 (1.4.0-1~16.04.1, 18.0.1-1~16.04.1), google-chrome-stable:amd64 (67.0.3396.87-1, 67.0.3396.99-1), libxatracker2:amd64 (17.2.8-0ubuntu0~16.04.1, 18.0.5-0ubuntu0~16.04.1), libegl1-mesa:amd64 (17.2.8-0ubuntu0~16.04.1, 18.0.5-0ubuntu0~16.04.1), libapt-pkg5.0:amd64 (1.2.26, 1.2.27), libsoup2.4-1:amd64 (2.52.2-1ubuntu0.2, 2.52.2-1ubuntu0.3), libgbm1:amd64 (17.2.8-0ubuntu0~16.04.1, 18.0.5-0ubuntu0~16.04.1), libdrm-amdgpu1:amd64 (2.4.83-1~16.04.1, 2.4.91-2~16.04.1), firefox-locale-en:amd64 (60.0.2+build1-0ubuntu0.16.04.1, 61.0+build3-0ubuntu0.16.04.2), libwayland-egl1-mesa:amd64 (17.2.8-0ubuntu0~16.04.1, 18.0.5-0ubuntu0~16.04.1), libdrm2:amd64 (2.4.83-1~16.04.1, 2.4.91-2~16.04.1), oracle-java8-set-default:amd64 (8u171-1~webupd8~0, 8u171-1~webupd8~1), rfkill:amd64 (0.5-1ubuntu3, 0.5-1ubuntu3.1), apt-utils:amd64 (1.2.26, 1.2.27), libgl1-mesa-dri:amd64 (17.2.8-0ubuntu0~16.04.1, 18.0.5-0ubuntu0~16.04.1), oracle-java8-installer:amd64 (8u171-1~webupd8~0, 8u171-1~webupd8~1), xserver-xorg-video-intel-hwe-16.04:amd64 (2:2.99.917+git20170309-0ubuntu1~16.04.1, 2:2.99.917+git20171229-1~16.04.1), xserver-xorg-core-hwe-16.04:amd64 (2:1.19.5-0ubuntu2~16.04.1, 2:1.19.6-1ubuntu4~16.04.1), libgl1-mesa-glx:amd64 (17.2.8-0ubuntu0~16.04.1, 18.0.5-0ubuntu0~16.04.1), libdrm-intel1:amd64 (2.4.83-1~16.04.1, 2.4.91-2~16.04.1), firefox:amd64 (60.0.2+build1-0ubuntu0.16.04.1, 61.0+build3-0ubuntu0.16.04.2), apt-transport-https:amd64 (1.2.26, 1.2.27), libdrm-radeon1:amd64 (2.4.83-1~16.04.1, 2.4.91-2~16.04.1), xserver-xorg-legacy-hwe-16.04:amd64 (2:1.19.5-0ubuntu2~16.04.1, 2:1.19.6-1ubuntu4~16.04.1), mesa-vdpau-drivers:amd64 (17.2.8-0ubuntu0~16.04.1, 18.0.5-0ubuntu0~16.04.1), xserver-xorg-video-radeon-hwe-16.04:amd64 (1:7.10.0-1~16.04.1, 1:18.0.1-1~16.04.1), libexiv2-14:amd64 (0.25-2.1ubuntu16.04.1, 0.25-2.1ubuntu16.04.2), update-notifier:amd64 (3.168.8, 3.168.9), xserver-xorg-video-ati-hwe-16.04:amd64 (1:7.10.0-1~16.04.1, 1:18.0.1-1~16.04.1), mesa-va-drivers:amd64 (17.2.8-0ubuntu0~16.04.1, 18.0.5-0ubuntu0~16.04.1), libdrm-common:amd64 (2.4.83-1~16.04.1, 2.4.91-2~16.04.1)
End-Date: 2018-07-07 19:07:52
Start-Date: 2018-07-11 15:22:26
Commandline: apt install android-tools-adb
Requested-By: user (1000)
Install: android-tools-adb:amd64 (5.1.1r36+git20160322-0ubuntu3)
End-Date: 2018-07-11 15:22:27
Start-Date: 2018-07-15 10:39:49
Commandline: /usr/bin/unattended-upgrade
Upgrade: libimage-magick-perl:amd64 (8:6.8.9.9-7ubuntu5.11, 8:6.8.9.9-7ubuntu5.12), libcups2:amd64 (2.1.3-4ubuntu0.4, 2.1.3-4ubuntu0.5), libimage-magick-q16-perl:amd64 (8:6.8.9.9-7ubuntu5.11, 8:6.8.9.9-7ubuntu5.12), imagemagick:amd64 (8:6.8.9.9-7ubuntu5.11, 8:6.8.9.9-7ubuntu5.12), libmagickwand-6.q16-2:amd64 (8:6.8.9.9-7ubuntu5.11, 8:6.8.9.9-7ubuntu5.12), cups-server-common:amd64 (2.1.3-4ubuntu0.4, 2.1.3-4ubuntu0.5), cups-common:amd64 (2.1.3-4ubuntu0.4, 2.1.3-4ubuntu0.5), libpng12-dev:amd64 (1.2.54-1ubuntu1, 1.2.54-1ubuntu1.1), imagemagick-6.q16:amd64 (8:6.8.9.9-7ubuntu5.11, 8:6.8.9.9-7ubuntu5.12), libmagickcore-6.q16-2-extra:amd64 (8:6.8.9.9-7ubuntu5.11, 8:6.8.9.9-7ubuntu5.12), cups-ppdc:amd64 (2.1.3-4ubuntu0.4, 2.1.3-4ubuntu0.5), libcupsmime1:amd64 (2.1.3-4ubuntu0.4, 2.1.3-4ubuntu0.5), firefox-locale-en:amd64 (61.0+build3-0ubuntu0.16.04.2, 61.0.1+build1-0ubuntu0.16.04.1), libmagickcore-6.q16-2:amd64 (8:6.8.9.9-7ubuntu5.11, 8:6.8.9.9-7ubuntu5.12), libjpeg-turbo8:amd64 (1.4.2-0ubuntu3, 1.4.2-0ubuntu3.1), libcupsppdc1:amd64 (2.1.3-4ubuntu0.4, 2.1.3-4ubuntu0.5), firefox:amd64 (61.0+build3-0ubuntu0.16.04.2, 61.0.1+build1-0ubuntu0.16.04.1), imagemagick-common:amd64 (8:6.8.9.9-7ubuntu5.11, 8:6.8.9.9-7ubuntu5.12), libmagick++-6.q16-5v5:amd64 (8:6.8.9.9-7ubuntu5.11, 8:6.8.9.9-7ubuntu5.12), cups-bsd:amd64 (2.1.3-4ubuntu0.4, 2.1.3-4ubuntu0.5), cups-core-drivers:amd64 (2.1.3-4ubuntu0.4, 2.1.3-4ubuntu0.5), cups-daemon:amd64 (2.1.3-4ubuntu0.4, 2.1.3-4ubuntu0.5), libcupsimage2:amd64 (2.1.3-4ubuntu0.4, 2.1.3-4ubuntu0.5), cups:amd64 (2.1.3-4ubuntu0.4, 2.1.3-4ubuntu0.5), libcupscgi1:amd64 (2.1.3-4ubuntu0.4, 2.1.3-4ubuntu0.5), cups-client:amd64 (2.1.3-4ubuntu0.4, 2.1.3-4ubuntu0.5), perlmagick:amd64 (8:6.8.9.9-7ubuntu5.11, 8:6.8.9.9-7ubuntu5.12), libpng12-0:amd64 (1.2.54-1ubuntu1, 1.2.54-1ubuntu1.1)
End-Date: 2018-07-15 10:40:06
Start-Date: 2018-07-15 10:51:00
Commandline: aptdaemon role='role-commit-packages' sender=':1.730'
Upgrade: dnsmasq-base:amd64 (2.75-1ubuntu0.16.04.4, 2.75-1ubuntu0.16.04.5), flashplugin-installer:amd64 (30.0.0.113ubuntu0.16.04.1, 30.0.0.134ubuntu0.16.04.1), thunderbird-gnome-support:amd64 (1:52.8.0+build1-0ubuntu0.16.04.1, 1:52.9.1+build3-0ubuntu0.16.04.1), thunderbird-locale-en-us:amd64 (1:52.8.0+build1-0ubuntu0.16.04.1, 1:52.9.1+build3-0ubuntu0.16.04.1), thunderbird:amd64 (1:52.8.0+build1-0ubuntu0.16.04.1, 1:52.9.1+build3-0ubuntu0.16.04.1), dns-root-data:amd64 (2015052300+h+1, 2018013001~16.04.1), linux-firmware:amd64 (1.157.19, 1.157.20), thunderbird-locale-en:amd64 (1:52.8.0+build1-0ubuntu0.16.04.1, 1:52.9.1+build3-0ubuntu0.16.04.1)
End-Date: 2018-07-15 10:52:16
Start-Date: 2018-07-17 11:07:13
Commandline: aptdaemon role='role-install-file' sender=':1.83'
Install: libxcb-xtest0:amd64 (1.11.1-1ubuntu1, automatic)
End-Date: 2018-07-17 11:07:14
Start-Date: 2018-07-18 11:32:40
Commandline: /usr/bin/unattended-upgrade
Upgrade: libpolkit-gobject-1-0:amd64 (0.105-14.1, 0.105-14.1ubuntu0.1), libpolkit-agent-1-0:amd64 (0.105-14.1, 0.105-14.1ubuntu0.1), libpolkit-backend-1-0:amd64 (0.105-14.1, 0.105-14.1ubuntu0.1), policykit-1:amd64 (0.105-14.1, 0.105-14.1ubuntu0.1)
End-Date: 2018-07-18 11:32:44
Start-Date: 2018-07-19 16:49:39
Commandline: apt upgrade
Requested-By: user (1000)
Upgrade: snapd:amd64 (2.32.9, 2.33.1ubuntu2), squashfs-tools:amd64 (1:4.3-3ubuntu2.16.04.1, 1:4.3-3ubuntu2.16.04.2), gnome-software:amd64 (3.20.5-0ubuntu0.16.04.10, 3.20.5-0ubuntu0.16.04.11), python-apt-common:amd64 (1.1.0~beta1ubuntu0.16.04.1, 1.1.0~beta1ubuntu0.16.04.2), ubuntu-software:amd64 (3.20.5-0ubuntu0.16.04.10, 3.20.5-0ubuntu0.16.04.11), chromium-codecs-ffmpeg-extra:amd64 (66.0.3359.181-0ubuntu0.16.04.1, 67.0.3396.99-0ubuntu0.16.04.2), ubuntu-core-launcher:amd64 (2.32.9, 2.33.1ubuntu2), oracle-java8-set-default:amd64 (8u171-1~webupd8~1, 8u181-1~webupd8~1), oracle-java8-installer:amd64 (8u171-1~webupd8~1, 8u181-1~webupd8~1), gnome-software-common:amd64 (3.20.5-0ubuntu0.16.04.10, 3.20.5-0ubuntu0.16.04.11), python3-apt:amd64 (1.1.0~beta1ubuntu0.16.04.1, 1.1.0~beta1ubuntu0.16.04.2)
End-Date: 2018-07-19 16:50:45
答案1
这可能是由于 2018-07-07 版本升级导致这些软件包（所有与图形相关的软件包）升级所致
libdrm-nouveau2:amd64
xserver-xorg-video-amdgpu-hwe-16.04
libegl1-mesa
libdrm-amdgpu1
libdrm2:amd64
libgl1-mesa-dri:amd64
xserver-xorg-video-intel-hwe-16.04:amd64
xserver-xorg-core-hwe-16.04:amd64
libgl1-mesa-glx:amd64
libdrm-intel1:amd64
libdrm-radeon1:amd64
xserver-xorg-video-ati-hwe-16.04:amd64
mesa-va-drivers:amd64
libdrm-common:amd64
libwayland-egl1-mesa:amd64
因此，您可以尝试使用以下方法重新安装旧版本
sudo apt install libdrm-nouveau2:amd64=2.4.83-1~16.04.1 libglapi-mesa:amd64=17.2.8-0ubuntu0~16.04.1 xserver-xorg-video-amdgpu-hwe-16.04:amd64=1.4.0-1~16.04.1 libegl1-mesa:amd64=17.2.8-0ubuntu0~16.04.1 libdrm-amdgpu1:amd64=2.4.83-1~16.04.1 libwayland-egl1-mesa:amd64=17.2.8-0ubuntu0~16.04.1 libdrm2:amd64=2.4.83-1~16.04.1 libgl1-mesa-dri:amd64=17.2.8-0ubuntu0~16.04.1 xserver-xorg-video-intel-hwe-16.04:amd64=2:2.99.917+git20170309-0ubuntu1~16.04.1 xserver-xorg-core-hwe-16.04:amd64=2:1.19.5-0ubuntu2~16.04.1 libgl1-mesa-glx:amd64=17.2.8-0ubuntu0~16.04.1 libdrm-intel1:amd64=2.4.83-1~16.04.1 libdrm-radeon1:amd64=2.4.83-1~16.04.1 xserver-xorg-legacy-hwe-16.04:amd64=2:1.19.5-0ubuntu2~16.04.1 mesa-vdpau-drivers:amd64=17.2.8-0ubuntu0~16.04.1 xserver-xorg-video-radeon-hwe-16.04:amd64=1:7.10.0-1~16.04.1 xserver-xorg-video-ati-hwe-16.04:amd64=1:7.10.0-1~16.04.1 mesa-va-drivers:amd64=17.2.8-0ubuntu0~16.04.1 libdrm-common:amd64=2.4.83-1~16.04.1
但它可能会破坏依赖关系（所以你需要自己修复它）或者无法工作，因为我还没有测试过它（这意味着你需要使用另一个命令来重新安装旧版本）