Copying plain text from XWayland -> Electron Wayland can freeze target application

[matejdro]

Hyprland version

Hyprland 0.49.0 built from branch makepkg at commit fcb6f93

Regression

Yes. First bad commit: 9228116

Describe the bug

When copying plain text from XWayland -> Wayland, target application will freeze (with the Hyprland's not responding dialog shown if it is an GUI application), seemingly indefinitely.

Reproduction steps

1. Copy large amount of text (600+ lines) from an XWayland app
2. Paste into VS Code (running in native Wayland)
3. Note that VS Code will freeze and not responding dialog will pop up

Logs

xwayland -> Wayland:

Hyprland logs:

[LOG] [CWLDataDeviceProtocol] New selection for data source 5f267a03dca0
[LOG] [CWLDataDeviceProtocol] CWLDataDeviceProtocol::setSelection: ignoring X11 data device
[LOG] [CDataDeviceWLRProtocol] New selection for data source 5f267a03dca0

...

[LOG] [CWLSeatProtocol] New seat resource bound at 5f267a02b9c0
[LOG] [CWLDataDeviceProtocol] New datamgr resource bound at 5f2679f0fe10
[LOG] [CXDGShellProtocol] New xdg_wm_base at 5f267a0caa80
[LOG] [CDataDeviceWLRProtocol] New wlr_data_control_manager at 5f2679f57170
[LOG] [CPrimarySelectionProtocol] New primary_seletion_manager at 5f267a038bb0
[LOG] [CDataDeviceWLRProtocol] New  offer 5f267a0dc370 for data source 5f2679eaf5b0
[LOG] [CDataDeviceWLRProtocol] New primary offer 5f267a02a390 for data source 5f267a0a6980
[LOG] [CWLRDataControlManagerResource] New wlr data device bound at 5f267a085060
[LOG] [CWLRDataOffer] Offer 5f267a0dc370 asks to send data from source 5f2679eaf5b0

wl_paste_paste_from_xwayland.txt

wayland -> Wayland:

Hyprland logs:

[LOG] [CWLDataDeviceProtocol] resetting selection
[WARN] [/usr/src/debug/hyprland/Hyprland-0.48.1/src/protocols/core/DataDevice.cpp:352] New data source before a device was created
[LOG] [CWLDataDeviceManagerResource] New data source bound at 5f267a10f170
[LOG] [CWLDataDeviceProtocol] New selection for data source 5f267a10f170
[LOG] [CWLDataDeviceProtocol] New wayland offer 5f2679f8eb40 for data source 5f267a10f170
[LOG] [CWLDataOfferResource]  | offer 5f2679f8eb40 supports mime text/plain;charset=utf-8
[LOG] [CWLDataOfferResource]  | offer 5f2679f8eb40 supports mime UTF8_STRING
[LOG] [CWLDataOfferResource]  | offer 5f2679f8eb40 supports mime COMPOUND_TEXT
[LOG] [CWLDataOfferResource]  | offer 5f2679f8eb40 supports mime TEXT
[LOG] [CWLDataOfferResource]  | offer 5f2679f8eb40 supports mime text/plain
[LOG] [CWLDataOfferResource]  | offer 5f2679f8eb40 supports mime STRING
[LOG] [CWLDataOfferResource]  | offer 5f2679f8eb40 supports mime text/plain;charset=utf-8
[LOG] [CWLDataOfferResource]  | offer 5f2679f8eb40 supports mime text/plain
[LOG] [CDataDeviceWLRProtocol] New selection for data source 5f267a10f170
[WARN] [seat] duplicated setCurrentSelection?
[LOG] [CPrimarySelectionProtocol] resetting selection
[LOG] [CPrimarySelectionManager] New primary selection data source bound at 5f267a10dd80
[LOG] [CPrimarySelectionDevice] wlr manager requests selection to 5f267a10dd80
[LOG] [CPrimarySelectionProtocol] New selection for data source 5f267a10dd80
[LOG] [CPrimarySelectionProtocol] New offer 5f267a09d7c0 for data source 5f267a10dd80
[LOG] [CDataDeviceWLRProtocol] New primaryselection for data source 5f267a10dd80

...

[LOG] [CWLSeatProtocol] New seat resource bound at 5f2679fa7100
[LOG] [CWLDataDeviceProtocol] New datamgr resource bound at 5f2678d69460
[LOG] [CXDGShellProtocol] New xdg_wm_base at 5f267a088800
[LOG] [CDataDeviceWLRProtocol] New wlr_data_control_manager at 5f2679f0df20
[LOG] [CPrimarySelectionProtocol] New primary_seletion_manager at 5f2679f17ff0
[LOG] [CDataDeviceWLRProtocol] New  offer 5f267a0fa150 for data source 5f2679ce3fa0
[LOG] [CDataDeviceWLRProtocol] New primary offer 5f2679ecf000 for data source 5f267a09d740
[LOG] [CWLRDataControlManagerResource] New wlr data device bound at 5f267a109400
[LOG] [CWLRDataOffer] Offer 5f267a0fa150 asks to send data from source 5f2679ce3fa0
[LOG] [CLinuxDMABUFParamsResource] Creating a dmabuf, with id 51: size [Vector2D: x: 1891, y: 1051], fmt XR24, planes 1
[LOG] [CLinuxDMABUFParamsResource]  | plane 0: mod 72057594037927935 fd 102 stride 7680 offset 0

wl_paste_from_wayland.txt

System info and config

config.txt

[ghost]

cant repro this on git

[matejdro]

I looked a bit more into it:

1. I can still repro on the last git (Hyprland 0.49.0 built from branch makepkg at commit fcb6f936ea8b39ec42f5979e55c7aa4a060d2f30)
2. I was wrong on the regression part, it IS a Hyprland regression. First bad commit is 9228116
3. To reproduce reliably, you have to copy a big chunk of data. I tested with the 600+ lines of code.
4. Pasting into VS Code instead of using wl-paste is more reliable of a reproducer

(Also updated first post with that info)

[thiagoelg]

I'm also having this issue on 0.49.0. I tried to downgrade to 0.48.1 and got the same problem.

As a workaround I'm using this: #6132 (comment) (I'm using cliphist)

Installed it and added exec-once = clipsync to my hyprland.conf.

[matejdro]

I've tried this and clipsync does not seem to help with the freezing issue :|

[gustavosbarreto]

I’m also running into this extremely annoying bug: when I run VS Code under Xwayland and try to copy anything (via Ctrl+C or mouse selection) and paste into Firefox the app freezes and shows the "Application is not responding" dialog.

This is really limiting and disruptive to my workflow, since I frequently need to copy code snippets, URLs or terminal commands from VS Code and paste them straight into my browser.

[matejdro]

It seems this mostly happens when the target app is Electron - for example VS Code and Slack freeze, but Notepadqq doesn't.

[gustavosbarreto]

It seems this mostly happens when the target app is Electron - for example VS Code and Slack freeze, but Notepadqq doesn't.

Based on your comment, I tried launching VS Code in Wayland mode and that actually resolved the problem for me.

$ cat ~/.config/code-flags.conf
--ozone-platform-hint=wayland

[matejdro]

Target app or source app? For me, issue happens when the target app is in the Wayland mode, but source app in the XWayland.

[gustavosbarreto]

Target app or source app?

Source app.

For me, the issue happens when the target app is in Wayland mode, but the source app is in XWayland.

Same here. When copying from VSCode (XWayland) and pasting into Chrome (Wayland), the app freezes and the ANR dialog appears.

To avoid this, I added the --ozone-platform-hint=wayland to ~/.config/code-flags.conf to force VSCode to run in Wayland mode.

[matejdro]

Yeah this works vor VS Code. But not all apps have a simple Wayland switch, notably most Java apps.

[niraularohan]

facing same issue, with java apps, any fix?

[matejdro]

This is still happening with the

Hyprland 0.50.1 built from branch  at commit 4e242d086e20b32951fdc0ebcbfb4d41b5be8dcc  ([gha] Nix: update inputs).
Date: Sat Jul 19 21:37:06 2025
Tag: v0.50.1, commits: 6291
built against:
 aquamarine 0.9.2
 hyprlang 0.6.3
 hyprutils 0.8.1
 hyprcursor 0.1.12
 hyprgraphics 0.1.5


no flags were set


System Information:
System name: Linux
Node name: matejd-desktop
Release: 6.15.7-arch1-1.1
Version: #1 SMP PREEMPT_DYNAMIC Fri, 18 Jul 2025 15:52:30 +0000


GPU information: 
03:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Navi 21 [Radeon RX 6950 XT] [1002:73a5] (rev c0) (prog-if 00 [VGA controller])
11:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Granite Ridge [Radeon Graphics] [1002:13c0] (rev c9) (prog-if 00 [VGA controller])


os-release: NAME="Arch Linux"
PRETTY_NAME="Arch Linux"
ID=arch
BUILD_ID=rolling
ANSI_COLOR="38;2;23;147;209"
HOME_URL="https://archlinux.org/"
DOCUMENTATION_URL="https://wiki.archlinux.org/"
SUPPORT_URL="https://bbs.archlinux.org/"
BUG_REPORT_URL="https://gitlab.archlinux.org/groups/archlinux/-/issues"
PRIVACY_POLICY_URL="https://terms.archlinux.org/docs/privacy-policy/"
LOGO=archlinux-logo


plugins:

although I had some troubles reproducing with the VS Code. Pasting into Slack (another electron app), reproduced it immediately though.

[Insprill]

I'm also encountering this issue with Unity 2019 (XWayland) when copying assembly from a Burst function, which can be 600+kb of plain text. Pasting into Rider (Wayland-native) freezes indefinitely, while pasting into Firefox freezes for a moment before timing out, and running wl-paste hangs indefinitely.

Interestingly, Clipboard appears to have no issues pasting the entire buffer, which led me to the workaround of running cb paste | wl-copy. This resolves the problem and allows me to paste the whole buffer into any Wayland-native application without issues. Upon checking the contents, nothing appears to be truncated.

Tested on Hyprland 0.50.1.

[niraularohan]

Hey, how do you run that command automatically? Have you mapped it to some key combination, or you have some script which automatically does that?

I've been trying to achieve that for sometime, and trying not to use SUPER + somekey just to execute that command on every copy, but struggling with it, please let me know your approach.

Thanks!

[Insprill]

I just left a terminal window open and ran the command manually since copying out of Unity isn't something I have to do all that often. The last couple of days, it's been working fine, so I didn't put any more effort into making my workaround more convenient. Sorry!