Public bug reported:

When I go on fullscreen on a video on Firefox with HIDPI scaling factors
more than 100%, I get odd behavior of the fullscreen video.  This
behavior is not seen on Chrome, or if the scaling factor is 100%.

Basically, it seems like there is some resizing of the video to a
smaller window in the upper left, and when I escape fullscreen,
sometimes the firefox window itself is scaled off the display.

At times, this glitches a few times and eventually resets, sometimes, it
stays this way.  It appears to have changed behavior multiple times over
the past few weeks of updates of various parts of the stack, and may
just be narrowed down for me now to something repeatable.  For instance
sometimes I could not trigger it until I pressed volume up or volume
down.  Now it appears to happen just waiting for a few seconds on the
running video.

This is on X11, and on focal with the latest updates as of today
2020-04-01.

Happy to debug more, not sure what information is useful.

thanks!

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: firefox 74.0+build3-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.11-0ubuntu21
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  dpb        1522 F.... pulseaudio
BuildID: 20200309095159
Channel: Unavailable
CurrentDesktop: ubuntu:GNOME
Date: Wed Apr  1 21:12:08 2020
DefaultProfileExtensions: extensions.sqlite corrupt or missing
DefaultProfileIncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
DefaultProfileLocales: extensions.sqlite corrupt or missing
DefaultProfilePrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:729
DefaultProfileThemes: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2020-02-22 (39 days ago)
InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 
(20200203.1)
IpRoute:
 default via 10.10.0.1 dev wlp4s0 proto dhcp metric 600 
 10.10.0.0/16 dev wlp4s0 proto kernel scope link src 10.10.1.4 metric 600 
 169.254.0.0/16 dev wlp4s0 scope link metric 1000
ProcEnviron:
 TERM=screen-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Profile0Extensions: extensions.sqlite corrupt or missing
Profile0IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
Profile0Locales: extensions.sqlite corrupt or missing
Profile0PrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:729
Profile0PrefSources: prefs.js
Profile0Themes: extensions.sqlite corrupt or missing
Profiles:
 Profile1 (Default) - LastVersion=None/None (Out of date)
 Profile0 - LastVersion=74.0/20200309095159
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: Upgraded to focal on 2020-02-22 (39 days ago)
dmi.bios.date: 11/25/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: N1MET59W (1.44 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20HRCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: 
dmi:bvnLENOVO:bvrN1MET59W(1.44):bd11/25/2019:svnLENOVO:pn20HRCTO1WW:pvrThinkPadX1Carbon5th:rvnLENOVO:rn20HRCTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad X1 Carbon 5th
dmi.product.name: 20HRCTO1WW
dmi.product.sku: LENOVO_MT_20HR_BU_Think_FM_ThinkPad X1 Carbon 5th
dmi.product.version: ThinkPad X1 Carbon 5th
dmi.sys.vendor: LENOVO

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


** Tags: amd64 apport-bug champagne focal

** Tags added: champagne

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/1870259

Title:
  firefox fullscreen display glitches with hidpi scalingb

Status in firefox package in Ubuntu:
  New

Bug description:
  When I go on fullscreen on a video on Firefox with HIDPI scaling
  factors more than 100%, I get odd behavior of the fullscreen video.
  This behavior is not seen on Chrome, or if the scaling factor is 100%.

  Basically, it seems like there is some resizing of the video to a
  smaller window in the upper left, and when I escape fullscreen,
  sometimes the firefox window itself is scaled off the display.

  At times, this glitches a few times and eventually resets, sometimes,
  it stays this way.  It appears to have changed behavior multiple times
  over the past few weeks of updates of various parts of the stack, and
  may just be narrowed down for me now to something repeatable.  For
  instance sometimes I could not trigger it until I pressed volume up or
  volume down.  Now it appears to happen just waiting for a few seconds
  on the running video.

  This is on X11, and on focal with the latest updates as of today
  2020-04-01.

  Happy to debug more, not sure what information is useful.

  thanks!

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: firefox 74.0+build3-0ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.20.11-0ubuntu21
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dpb        1522 F.... pulseaudio
  BuildID: 20200309095159
  Channel: Unavailable
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Apr  1 21:12:08 2020
  DefaultProfileExtensions: extensions.sqlite corrupt or missing
  DefaultProfileIncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
  DefaultProfileLocales: extensions.sqlite corrupt or missing
  DefaultProfilePrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:729
  DefaultProfileThemes: extensions.sqlite corrupt or missing
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2020-02-22 (39 days ago)
  InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 
(20200203.1)
  IpRoute:
   default via 10.10.0.1 dev wlp4s0 proto dhcp metric 600 
   10.10.0.0/16 dev wlp4s0 proto kernel scope link src 10.10.1.4 metric 600 
   169.254.0.0/16 dev wlp4s0 scope link metric 1000
  ProcEnviron:
   TERM=screen-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  Profile0Extensions: extensions.sqlite corrupt or missing
  Profile0IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
  Profile0Locales: extensions.sqlite corrupt or missing
  Profile0PrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:729
  Profile0PrefSources: prefs.js
  Profile0Themes: extensions.sqlite corrupt or missing
  Profiles:
   Profile1 (Default) - LastVersion=None/None (Out of date)
   Profile0 - LastVersion=74.0/20200309095159
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  UpgradeStatus: Upgraded to focal on 2020-02-22 (39 days ago)
  dmi.bios.date: 11/25/2019
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N1MET59W (1.44 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20HRCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN1MET59W(1.44):bd11/25/2019:svnLENOVO:pn20HRCTO1WW:pvrThinkPadX1Carbon5th:rvnLENOVO:rn20HRCTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad X1 Carbon 5th
  dmi.product.name: 20HRCTO1WW
  dmi.product.sku: LENOVO_MT_20HR_BU_Think_FM_ThinkPad X1 Carbon 5th
  dmi.product.version: ThinkPad X1 Carbon 5th
  dmi.sys.vendor: LENOVO

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