Missing letters scattered across the interface

[Pedro Côrte-Real]

Today my gnome-shell instance did something extremely strange. Suddenly around 2/3 of the letters, randomly scattered, were missing from the interface. I've attached a screenshot.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-shell 3.28.2-0ubuntu0.18.04.1
ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
Uname: Linux 4.15.0-24-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Jul 19 01:23:21 2018
DisplayManager: gdm3
InstallationDate: Installed on 2018-05-31 (48 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

I've seen similar bug reports before.

To help us confirm it's the same issue, please run:

  lspci -k

and send us the output.

[Pedro Côrte-Real (pedrocr)]

$ lspci -k
00:00.0 Host bridge: Intel Corporation Skylake Host Bridge/DRAM Registers (rev 08)
 Subsystem: Lenovo Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Host Bridge/DRAM Registers
 Kernel driver in use: skl_uncore
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 520 (rev 07)
 Subsystem: Lenovo Skylake GT2 [HD Graphics 520]
 Kernel driver in use: i915
 Kernel modules: i915
00:08.0 System peripheral: Intel Corporation Skylake Gaussian Mixture Model
 Subsystem: Lenovo Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th Gen Core Processor Gaussian Mixture Model
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)
 Subsystem: Lenovo Sunrise Point-LP USB 3.0 xHCI Controller
 Kernel driver in use: xhci_hcd
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)
 Subsystem: Lenovo Sunrise Point-LP Thermal subsystem
 Kernel driver in use: intel_pch_thermal
 Kernel modules: intel_pch_thermal
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI #1 (rev 21)
 Subsystem: Lenovo Sunrise Point-LP CSME HECI
 Kernel driver in use: mei_me
 Kernel modules: mei_me
00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode] (rev 21)
 Subsystem: Lenovo Sunrise Point-LP SATA Controller [AHCI mode]
 Kernel driver in use: ahci
 Kernel modules: ahci
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port (rev f1)
 Kernel driver in use: pcieport
 Kernel modules: shpchp
00:1c.2 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port (rev f1)
 Kernel driver in use: pcieport
 Kernel modules: shpchp
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-LP LPC Controller (rev 21)
 Subsystem: Lenovo Sunrise Point-LP LPC Controller
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
 Subsystem: Lenovo Sunrise Point-LP PMC
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21)
 Subsystem: Lenovo Sunrise Point-LP HD Audio
 Kernel driver in use: snd_hda_intel
 Kernel modules: snd_hda_intel, snd_soc_skl
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
 Subsystem: Lenovo Sunrise Point-LP SMBus
 Kernel modules: i2c_i801
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection I219-V (rev 21)
 Subsystem: Lenovo Ethernet Connection I219-V
 Kernel driver in use: e1000e
 Kernel modules: e1000e
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader (rev 01)
 Subsystem: Lenovo RTS522A PCI Express Card Reader
 Kernel driver in use: rtsx_pci
 Kernel modules: rtsx_pci
04:00.0 Network controller: Intel Corporation Wireless 8260 (rev 3a)
 Subsystem: Intel Corporation Wireless 8260
 Kernel driver in use: iwlwifi
 Kernel modules: iwlwifi

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1774053, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.