Weird CTRL+SHIFT+KEY behaviour in Xorg sessions with "Locate Pointer" on

[Andrea Agnolin]

I run a newly installed Ubuntu Hirsute.
Inside a "Ubuntu on Xorg"(GNOME) session i cannot use CTRL+SHIFT+KEY shortcut normally.
If I press first CTRL, then SHIFT, then KEY everything works.
If I press SHIFT, then CTRL then KEY nothing happens.
On the Ubuntu (GNOME Wayland) session things works out normal.

Step to reproduce:
* Log in in a Xorg session
* Turn on the "Locate Pointer" setting in Setting/Accessibility
* Open gnome-terminal
* Press CTRL + SHIFT + "N" (in this order), a new terminal window appears
* Press SHIFT + CTRL + "N" (in this order), nothing happens.

The same happens with Firefox, Nautilus and other apps.

Possibly, Related to this, I also found that, only on a Xorg session, during a Wine-runned gamed I play "CTRL + KEY" behaves just like "KEY". But this might be a Wine bug.

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: xorg 1:7.7+22ubuntu1
ProcVersionSignature: Ubuntu 5.11.0-13.14-generic 5.11.7
Uname: Linux 5.11.0-13-generic x86_64
ApportVersion: 2.20.11-0ubuntu61
Architecture: amd64
BootLog: Error: [Errno 13] Permesso negato: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Tue Apr 6 14:14:37 2021
DistUpgraded: Fresh install
DistroCodename: hirsute
DistroVariant: ubuntu
DkmsStatus:
 rtl8821ce, 5.5.2.1, 5.11.0-13-generic, x86_64: installed
 virtualbox, 6.1.18, 5.11.0-13-generic, x86_64: installed
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation HD Graphics 620 [8086:5916] (rev 02) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company HD Graphics 620 [103c:84a7]
   Subsystem: Hewlett-Packard Company GM108M [GeForce MX130] [103c:84a7]
InstallationDate: Installed on 2021-03-31 (5 days ago)
InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Beta amd64 (20210331)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 0bda:b00a Realtek Semiconductor Corp. Realtek Bluetooth 4.2 Adapter
 Bus 001 Device 002: ID 05c8:03c7 Cheng Uei Precision Industry Co., Ltd (Foxlink) HP TrueVision HD Camera
 Bus 001 Device 004: ID 046d:c51b Logitech, Inc. V220 Cordless Optical Mouse for Notebooks
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: HP HP Laptop 15-da0xxx
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.11.0-13-generic root=UUID=81ec23d7-e690-4f52-b570-c2c252d1f0e8 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/21/2018
dmi.bios.release: 15.7
dmi.bios.vendor: Insyde
dmi.bios.version: F.07
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 84A7
dmi.board.vendor: HP
dmi.board.version: 80.31
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.ec.firmware.release: 80.31
dmi.modalias: dmi:bvnInsyde:bvrF.07:bd11/21/2018:br15.7:efr80.31:svnHP:pnHPLaptop15-da0xxx:pvrType1ProductConfigId:rvnHP:rn84A7:rvr80.31:cvnHP:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV HP Notebook
dmi.product.name: HP Laptop 15-da0xxx
dmi.product.sku: 4YC20EA#ABZ
dmi.product.version: Type1ProductConfigId
dmi.sys.vendor: HP
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.104-1build1
version.libgl1-mesa-dri: libgl1-mesa-dri 21.0.1-1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.10-3ubuntu5
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200714-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-1

[Daniel van Vugt (vanvugt)]

I can't seem to reproduce the problem using the steps provided above. Can you please try with a USB keyboard? This might be hardware-specific...

[Andrea Agnolin (agno94)]

I tried with an external USB keyboard. Same issue.
I have also run `dpkg-reconfigure keyboard-configuration`. Nothing has changed.

[Andrea Agnolin (agno94)]

I found a solution. I turned off the "Locate Pointer" accessibility setting.
So SHIFT+CTRL+KEY does not work in xorg session if "Locate Pointer" is turned on.

[Daniel van Vugt (vanvugt)]

I wonder if we can generalize this with bug 1872230