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** Changed in: mesa (Ubuntu)
       Status: New => Won't Fix

** Changed in: mutter (Ubuntu)
       Status: New => Won't Fix

** Changed in: xorg-server (Ubuntu)
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1846201

Title:
   Rendering is delayed on laptop display (works in external display)

Status in mesa package in Ubuntu:
  Won't Fix
Status in mutter package in Ubuntu:
  Won't Fix
Status in xorg-server package in Ubuntu:
  Won't Fix

Bug description:
  This is a very wierd behavior I get on the Lenovo Yoga S940 after upgrading 
to 19.10.
  This makes the laptop almost unusable with its own display.
  This happens only on the laptop display, not on the external display.

  
  The render of portions of the screen does not happen after some events 
(listed below) resulting in all or part of the screen not being re-rendered. 
The UX is that nothing happened, but it has. 
  This happens after:

  * key-stroke while typing sometimes
  * alt-tab
  * shift-right to align window to the right
  * ctrl-pgup/down to switch tab in multi tabs apps. 

  
  Please note that:
  * screenshots can't see the problem
  * also screenrecorder always seem ok, despite rendering being broken.


  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: xorg 1:7.7+19ubuntu12
  ProcVersionSignature: Ubuntu 5.3.0-13.14-generic 5.3.0
  Uname: Linux 5.3.0-13-generic x86_64
  ApportVersion: 2.20.11-0ubuntu7
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Oct  1 13:13:40 2019
  DistUpgraded: 2019-09-21 10:16:26,647 DEBUG Running PostInstallScript: 
'./xorg_fix_proprietary.py'
  DistroCodename: eoan
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation UHD Graphics 620 (Whiskey Lake) [8086:3ea0] (rev 02) 
(prog-if 00 [VGA controller])
     Subsystem: Lenovo UHD Graphics 620 (Whiskey Lake) [17aa:3801]
  InstallationDate: Installed on 2019-09-12 (18 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  MachineType: LENOVO 81Q7
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.3.0-13-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to eoan on 2019-09-21 (10 days ago)
  dmi.bios.date: 06/12/2019
  dmi.bios.vendor: LENOVO
  dmi.bios.version: AKCN34WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: LNVNB161216
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo Yoga S940-14IWL
  dmi.modalias: 
dmi:bvnLENOVO:bvrAKCN34WW:bd06/12/2019:svnLENOVO:pn81Q7:pvrLenovoYogaS940-14IWL:rvnLENOVO:rnLNVNB161216:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrLenovoYogaS940-14IWL:
  dmi.product.family: Yoga S940-14IWL
  dmi.product.name: 81Q7
  dmi.product.sku: LENOVO_MT_81Q7_BU_idea_FM_Yoga S940-14IWL
  dmi.product.version: Lenovo Yoga S940-14IWL
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.99-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 19.1.6-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.5+git20190820-0ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20190815-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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