[Bug 1775637] [NEW] Screen tearing both in scrolling and videos

[Pedro Côrte-Real]

Public bug reported:

Using firefox on the 18.04 default session (gnome-shell on Xorg) I get
screen tearing when scrolling and also in videos. It's evident in this
video for example:

https://www.youtube.com/watch?v=9hIRq5HTh5s

Where the lines between white and black areas seem to jump around and
that's not visible in a screenshot.

When scrolling it's common to see horizontal discontinuities in the
text.

Here's the details of my graphics card:

00:02.0 VGA compatible controller: Intel Corporation HD Graphics 520 (rev 07) (prog-if 00 [VGA controller])
	Subsystem: Lenovo Skylake GT2 [HD Graphics 520]
	Flags: bus master, fast devsel, latency 0, IRQ 126
	Memory at f0000000 (64-bit, non-prefetchable) [size=16M]
	Memory at e0000000 (64-bit, prefetchable) [size=256M]
	I/O ports at e000 [size=64]
	[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
	Capabilities: <access denied>
	Kernel driver in use: i915
	Kernel modules: i915

I'm using a Lenovo T460s

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: firefox 60.0.1+build2-0ubuntu0.18.04.1
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.9-0ubuntu7.1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/pcmC0D0p:   pedrocr    1619 F...m pulseaudio
 /dev/snd/controlC0:  pedrocr    1619 F.... pulseaudio
BuildID: 20180517114003
Channel: Unavailable
CurrentDesktop: ubuntu:GNOME
Date: Thu Jun  7 15:35:20 2018
Extensions: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
InstallationDate: Installed on 2018-05-31 (7 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
IpRoute:
 default via 10.120.200.1 dev wlp4s0 proto dhcp metric 600 
 10.23.69.0/24 dev tun0 proto kernel scope link src 10.23.69.103 
 10.120.200.0/22 dev wlp4s0 proto kernel scope link src 10.120.202.17 metric 600 
 169.254.0.0/16 dev wlp4s0 scope link metric 1000
Locales: extensions.sqlite corrupt or missing
MostRecentCrashID: bp-eee55497-e2e4-4c82-a862-236a81180223
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=60.0.1/20180517114003 (In use)
RunningIncompatibleAddons: False
SourcePackage: firefox
SubmittedCrashIDs:
 bp-eee55497-e2e4-4c82-a862-236a81180223
 bp-db2b7d55-dbe6-47a3-b50d-e9b691171230
 bp-280d460e-d837-442d-8543-17f3c1171202
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/22/2018
dmi.bios.vendor: LENOVO
dmi.bios.version: N1CET66W (1.34 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20FAS5TS00
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN1CET66W(1.34):bd03/22/2018:svnLENOVO:pn20FAS5TS00:pvrThinkPadT460s:rvnLENOVO:rn20FAS5TS00:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T460s
dmi.product.name: 20FAS5TS00
dmi.product.version: ThinkPad T460s
dmi.sys.vendor: LENOVO

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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Title:
  Screen tearing both in scrolling and videos

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