I've added instructions in the mesa bug on how to correctly set the
environment variable to workaround the issue:
https://gitlab.freedesktop.org/mesa/mesa/issues/2552#note_432595

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https://bugs.launchpad.net/bugs/1864274

Title:
  crunchy pixels

Status in Mesa:
  Unknown
Status in mesa package in Ubuntu:
  Confirmed

Bug description:
  Hello, after upgrading firefox (and many other packages) on focal
  today, I've got some video artifacts in firefox.

  When typing in text boxes and text fields, the new character is drawn
  very slowly, pixel-by-pixel, and isn't complete until the cursor has
  moved on. When larger portions of the screen are updated, it looks a
  lot like the entire window is being run through a video codec or you
  can see parts of the video memory from other processes. (But it looks
  more deliberate and predictable than either of these descriptions.)

  So far Firefox is the only application I've found that is affected.
  urxvt, libreoffice, xfontsel, glxgears all seem to work as expected.

  I did get cairo package update today, but the changelog is just:

  pango1.0 (1.44.7-1ubuntu2) focal; urgency=medium
    * No-change rebuild with fixed binutils on arm64.
   -- Matthias Klose <d...@ubuntu.com>  Sat, 08 Feb 2020 11:15:23 +0000

  And an xorg update:

  xorg (1:7.7+19ubuntu14) focal; urgency=medium
    * No-change rebuild with fixed binutils on arm64.
   -- Matthias Klose <d...@ubuntu.com>  Sat, 08 Feb 2020 11:21:28 +0000

  
  So I don't believe these are involved.

  00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 620
  (rev 07)

  Thanks

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: firefox 73.0.1+build1-0ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-14.17-generic 5.4.18
  Uname: Linux 5.4.0-14-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  AddonCompatCheckDisabled: False
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 
k5.4.0-14-generic.
  ApportVersion: 2.20.11-0ubuntu16
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  sarnold    3296 F.... pulseaudio
   /dev/snd/controlC0:  sarnold    3296 F.... pulseaudio
  BuildID: 20200217142647
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0x2fe1028000 irq 144'
     Mixer name : 'Realtek ALC285'
     Components : 'HDA:10ec0285,17aa225c,00100002 
HDA:8086280b,80860101,00100000'
     Controls      : 53
     Simple ctrls  : 15
  Card1.Amixer.info:
   Card hw:1 'Audio'/'Generic ThinkPad Dock USB Audio at 
usb-0000:00:14.0-4.2.4, high speed'
     Mixer name : 'USB Mixer'
     Components : 'USB17ef:306f'
     Controls      : 9
     Simple ctrls  : 4
  Channel: Unavailable
  Date: Sat Feb 22 05:41:10 2020
  ForcedLayersAccel: False
  IncompatibleExtensions:
   Pentadactyl - pentadac...@dactyl.googlecode.com
   English (GB) Language Pack - langpack-en...@firefox.mozilla.org
   English (South Africa) Language Pack - langpack-en...@firefox.mozilla.org
   Default - {972ce4c6-7e08-4474-a285-3208198ce6fd}
  IpRoute:
   default via 192.168.0.1 dev enp0s31f6 proto dhcp metric 100 
   10.23.231.0/24 dev lxdbr0 proto kernel scope link src 10.23.231.1 
   192.168.0.0/24 dev enp0s31f6 proto kernel scope link src 192.168.0.34 metric 
100 
   192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 
linkdown
  MostRecentCrashID: bp-ea952d4d-f25a-4ced-893c-8cabb2160112
  PrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:737
  PrefSources: prefs.js
  ProcEnviron:
   TERM=rxvt-unicode-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  Profiles: Profile0 (Default) - LastVersion=73.0.1/20200217142647 (In use)
  RunningIncompatibleAddons: True
  SourcePackage: firefox
  UpgradeStatus: Upgraded to focal on 2020-01-24 (28 days ago)
  dmi.bios.date: 11/25/2019
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N23ET69W (1.44 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20KHCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN23ET69W(1.44):bd11/25/2019:svnLENOVO:pn20KHCTO1WW:pvrThinkPadX1Carbon6th:rvnLENOVO:rn20KHCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad X1 Carbon 6th
  dmi.product.name: 20KHCTO1WW
  dmi.product.sku: LENOVO_MT_20KH_BU_Think_FM_ThinkPad X1 Carbon 6th
  dmi.product.version: ThinkPad X1 Carbon 6th
  dmi.sys.vendor: LENOVO

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