Update: it wasn't libdrm-intel1. I held back updates to that package, fully updated my system, rebooted, and get terrible graphical performance under OpenGL 2.0 and 3.1. Switching the rendering backend to XRender makes everything smooth again, though. Time to roll back my root filesystem again; figuring out which specific package(s) are causing this behavior seems like it's going to be a bit painful.

Today's daily Ubuntu (not Kubuntu) ISO didn't exhibit this problem.

MMR...

On 2018-02-23 10:08, Matt Ruffalo wrote:
Hi all-

I'm looking through bugs on Launchpad but haven't seen anything related to this yet, and I wanted to bring this to everyone's attention ASAP.

I'm running Kubuntu Bionic on my laptop: a 3rd-gen Thinkpad X1 Carbon, and `lspci` tells me that my video hardware is a "VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09)".

After installing some updates on the 21st or 22nd, I found that my Kubuntu installation had terrible video performance: graphical animations were choppy, there was noticeable stutter when moving windows around the screen, and the "blur" effect was initially disabled for the taskbar and application launcher menu. I use btrfs, and my systems are configured to take snapshots of all available subvolumes on every boot, so I could easily roll back my root subvolume to the previous state -- I kept the subvolume for the "bad" state so I could examine the apt log, though.

One or more of these updates seems to have caused this (directly from apt.log):

"""
Start-Date: 2018-02-20  19:52:00
Commandline: apt full-upgrade
Requested-By: mruffalo (1000)
Upgrade: libdrm-nouveau2:amd64 (2.4.89-1, 2.4.90-1), libdrm-nouveau2:i386 (2.4.89-1, 2.4.90-1), libdrm-amdgpu1:amd64 (2.4.89-1, 2.4.90-1), libdrm-amdgpu1:i386 (2.4.89-1, 2.4.90-1), libdrm2:amd64 (2.4.89-1, 2.4.90-1), libdrm2:i386 (2.4.89-1, 2.4.90-1), libdrm-intel1:amd64 (2.4.89-1, 2.4.90-1), libdrm-intel1:i386 (2.4.89-1, 2.4.90-1), libdrm-radeon1:amd64 (2.4.89-1, 2.4.90-1), libdrm-radeon1:i386 (2.4.89-1, 2.4.90-1), libdrm-common:amd64 (2.4.89-1, 2.4.90-1)
End-Date: 2018-02-20  19:52:12

Start-Date: 2018-02-21  10:38:15
Commandline: apt full-upgrade
Requested-By: mruffalo (1000)
Install: libegl1:amd64 (0.2.999+git20170802-2, automatic), libglvnd0:amd64 (0.2.999+git20170802-2, automatic)
Upgrade: milou:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), python3-distro-info:amd64 (0.17, 0.18), libkwinglutils11:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), plasma-workspace:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libtaskmanager6:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libplasma-geolocation-interface5:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), liboxygenstyle5-5:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libksignalplotter7:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), gtk3-engines-breeze:amd64 (5.12.1-0ubuntu1, 5.12.2-0ubuntu1), libqt5test5:amd64 (5.9.3+dfsg-0ubuntu3, 5.9.3+dfsg-0ubuntu4), libpowerdevilui5:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), kde-cli-tools:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), kde-config-gtk-style:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), bluedevil:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), qt5-gtk-platformtheme:amd64 (5.9.3+dfsg-0ubuntu3, 5.9.3+dfsg-0ubuntu4), kde-config-gtk-style-preview:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), breeze-cursor-theme:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), plasma-nm:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), plasma-pa:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libpam-kwallet-common:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), plasma-dataengines-addons:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libprocesscore7:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), kwin-style-breeze:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), kwin-data:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), ksshaskpass:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), plasma-wallpapers-addons:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libkf5sysguard-bin:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), systemsettings:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), plasma-discover-common:amd64 (5.12.1-0ubuntu2, 5.12.2-0ubuntu1), kde-style-breeze:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libqt5dbus5:amd64 (5.9.3+dfsg-0ubuntu3, 5.9.3+dfsg-0ubuntu4), kmenuedit:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libqt5sql5-sqlite:amd64 (5.9.3+dfsg-0ubuntu3, 5.9.3+dfsg-0ubuntu4), khotkeys:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), plasma-discover:amd64 (5.12.1-0ubuntu2, 5.12.2-0ubuntu1), python-cairo:amd64 (1.15.4-2, 1.16.2-1), libqt5widgets5:amd64 (5.9.3+dfsg-0ubuntu3, 5.9.3+dfsg-0ubuntu4), breeze:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), kde-style-oxygen-qt5:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), plasma-desktop:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), kactivitymanagerd:amd64 (5.12.1-0ubuntu1, 5.12.2-0ubuntu1), libkdecorations2-5v5:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), initramfs-tools-bin:amd64 (0.130ubuntu2, 0.130ubuntu3), user-manager:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), kde-style-breeze-qt4:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libkwineffects11:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), plasma-desktop-data:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), powerdevil-data:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libksgrd7:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libqt5xml5:amd64 (5.9.3+dfsg-0ubuntu3, 5.9.3+dfsg-0ubuntu4), libkworkspace5-5:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libqt5printsupport5:amd64 (5.9.3+dfsg-0ubuntu3, 5.9.3+dfsg-0ubuntu4), kwin-addons:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), kde-cli-tools-data:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libqt5concurrent5:amd64 (5.9.3+dfsg-0ubuntu3, 5.9.3+dfsg-0ubuntu4), plasma-runners-addons:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), oxygen-sounds:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libqt5gui5:amd64 (5.9.3+dfsg-0ubuntu3, 5.9.3+dfsg-0ubuntu4), kde-config-sddm:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libkscreenlocker5:amd64 (5.12.1-0ubuntu1, 5.12.2-0ubuntu1), libpam-kwallet4:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libpam-kwallet5:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), kgamma5:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), sddm-theme-breeze:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), kwayland-integration:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), kinfocenter:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libgcrypt20:amd64 (1.8.1-4, 1.8.1-4ubuntu1), libgcrypt20:i386 (1.8.1-4, 1.8.1-4ubuntu1), libkf5screen-bin:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), kwrited:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libkf5screen7:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), kwin:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libcolorcorrect5:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libqt5core5a:amd64 (5.9.3+dfsg-0ubuntu3, 5.9.3+dfsg-0ubuntu4), plasma-integration:amd64 (5.12.1-0ubuntu1, 5.12.2-0ubuntu1), kwin-x11:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), drkonqi:amd64 (5.12.1-0ubuntu1, 5.12.2-0ubuntu1), ksysguard-data:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libkwin4-effect-builtins1:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libqt5opengl5:amd64 (5.9.3+dfsg-0ubuntu3, 5.9.3+dfsg-0ubuntu4), ksysguardd:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), python3-cairo:amd64 (1.15.4-2, 1.16.2-1), libkfontinstui5:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), kscreen:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libqt5network5:amd64 (5.9.3+dfsg-0ubuntu3, 5.9.3+dfsg-0ubuntu4), libkfontinst5:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), polkit-kde-agent-1:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libkf5sysguard-data:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), kde-config-screenlocker:amd64 (5.12.1-0ubuntu1, 5.12.2-0ubuntu1), khotkeys-data:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), kdeplasma-addons-data:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), liboxygenstyleconfig5-5:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libkwinxrenderutils11:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), plasma-look-and-feel-org-kde-breezedark-desktop:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), breeze-gtk-theme:amd64 (5.12.1-0ubuntu1, 5.12.2-0ubuntu1), powerdevil:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libpowerdevilcore2:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libprocessui7:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libkdecorations2private5v5:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), ksysguard:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), initramfs-tools-core:amd64 (0.130ubuntu2, 0.130ubuntu3), kwin-common:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), initramfs-tools:amd64 (0.130ubuntu2, 0.130ubuntu3), qml-module-qtquick-controls-styles-breeze:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libqt5sql5:amd64 (5.9.3+dfsg-0ubuntu3, 5.9.3+dfsg-0ubuntu4), plasma-widgets-addons:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1), libssl1.0.0:amd64 (1.0.2n-1ubuntu2, 1.0.2n-1ubuntu3), libqt5sql5-mysql:amd64 (5.9.3+dfsg-0ubuntu3, 5.9.3+dfsg-0ubuntu4), libweather-ion7:amd64 (4:5.12.1-0ubuntu1, 4:5.12.2-0ubuntu1)
End-Date: 2018-02-21  10:42:56
"""

I haven't yet narrowed down exactly which package(s) may have caused this, but if I had to guess, I would probably lean toward 'libdrm-intel1'.

I also booted my laptop from today's (2018-02-23) daily Kubuntu desktop-amd64 ISO, and saw exactly the same poor graphical performance. (It seemed worth it to rule out some oddity in my configuration, since I think this Linux installation on my laptop dates back to the early development version of Artful.)

I haven't yet had a chance to boot today's daily Ubuntu ISO, but it would be interesting to see whether or not this is specific to Kubuntu vs. Ubuntu.

Thank you,
MMR...



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