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Flutter Sidebar stops working after PC wakes from sleep #5808
Description
Describe the bug
To Reproduce
- Open Flutter DevTools from the IDE sidebar (VS Code)
- Select any tool (e.g., Performance, Inspector, Network, Logging)
- DevTools panel does not respond — no action happens and the UI becomes stuck
Expected behavior
- DevTools should open the selected tool immediately
- The UI should remain responsive and allow switching between different DevTools tabs without freezing
Screenshots
https://github.com/user-attachments/assets/bbf2e501-7cdd-4ab6-8f69-d4a4a54079d9
Please complete the following information:
You can run the Dart: Collect Diagnostic Information command from the VS Code command palette (F1) to easily capture this information or provide it manually.
- Operating System and version: macOS Tahoe 26.1
- VS Code version: 1.106.1 (Universal)
- Dart extension version: 3.122.0
- Dart/Flutter SDK version: 3.122.0
- Target device: mobile (Android & iOS simulator)
Activity
DanTup commentedon Nov 19, 2025
Does this reproduce on all projects? And is it always broken from the start, or only once you perform some action (like starting the app)?
Could you try:
And also:
This will enable a log file of traffic over DTD. Reproduce the issue and click a few buttons, and then check whether anything is in the log file. (You can remove the line from
.vscode/settings.jsononce done).Thanks!
[-]Flutter DevTools keeps freezing / stops responding[/-][+]Clicking actions in Flutter side bar does not do anything[/+]khusantoy commentedon Nov 19, 2025
In the console tab, I see these errors when I click actions
khusantoy commentedon Nov 19, 2025
Full views:
DanTup commentedon Nov 19, 2025
Thanks! It looks like the embedded page has lost its connection to DTD. I don't suppose you've noticed if you get a prompt in the bottom right corner telling you DTD has terminated? I wonder if this could be related to #5794
If you are seeing DTD terminate, then adding:
To your
.vscode/settings.jsontemporarily and then reproduce the error might help check if the daemon printed any errors.khusantoy commentedon Nov 19, 2025
I haven’t seen DTD terminate, and I didn’t receive any notification about it either.
DanTup commentedon Nov 19, 2025
@khusantoy are you able to enable the log noted above and see if it records any errors (and if not, perhaps will at least confirm the service is still running). If it is still running, then we may have to debug this from the DevTools side to undestand why it's not connecting (or is disconnecting).
Can you confirm if there were any other errors above the ones you included before in the developer tools console? (I'm wondering if here's any error about the connection closing, prior to these failed requests).
DanTup commentedon Nov 19, 2025
Could you also confirm what version of Flutter you're using? (in the original issue you only included the version of the extension, not the SDK). Thanks!
khusantoy commentedon Nov 25, 2025
Flutter 3.38.3 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 19074d12f7 (4 days ago) • 2025-11-20 17:53:13 -0500
Engine • hash 8bf2090718fea3655f466049a757f823898f0ad1 (revision 13e658725d) (4 days ago) • 2025-11-20
20:19:23.000Z
Tools • Dart 3.10.1 • DevTools 2.51.1
DanTup commentedon Nov 25, 2025
@khusantoy thanks - could you also capture the log noted above? Thanks!
khusantoy commentedon Nov 26, 2025
tooling_daemon.txt
4 remaining items
DanTup commentedon Dec 1, 2025
@khusantoy out of interest, do you have Norton Antivirus?
If so, this issue might be similar to what's I've been debugging at #5794 (comment)
khusantoy commentedon Dec 2, 2025
No I don't use it
DanTup commentedon Dec 3, 2025
@khusantoy thanks for confirming. Are you able to capture the logging from the debug build provided above? Thanks!
khusantoy commentedon Dec 3, 2025
dart-code-log.txt
khusantoy commentedon Dec 3, 2025
I’ve found a consistent way to reproduce the issue:
DanTup commentedon Dec 3, 2025
@elliette I can repro this with the steps above. I think is the issue you recently described (related to flutter/devtools#9028)... I had assumed it was only related to Chrome throttling bg tabs but didn't consider the laptop going to sleep!
If I understand that change correctly, the fix you made only applies to the property editor. I wonder if it could be made more general so that all pages would be reinitialized if the DTD connection drops?
We could probably force a refresh from the Dart-Code side, although if we were to just do that, we could perhaps also do it from within DevTools so it's in control (eg. it could do it for any connection drop rather than only when Dart-Code thinks we awoke from sleep - assuming we can detect such a thing).
[-]Clicking actions in Flutter side bar does not do anything[/-][+]Flutter Sidebar stops working after PC wakes from sleep[/+]Attempt to reconnect to DTD automatically if the connection drops
DanTup commentedon Dec 17, 2025
I landed a change in DevTools at flutter/devtools#9587 which will detect when the DTD connection drops and automatically try to reconnect (up to 5 times, but if it still hasn't connected, you can manually trigger it to try again).
It will show up in a future SDK release (first a DevTools release will roll into Dart, and then Dart will roll into Flutter) rather than a VS Code extension update.
khusantoy commentedon Jan 30, 2026
Hi @DanTup
Thank you for the fix! I'm still experiencing this issue frequently and would like to know when this fix will be available.
Could you please clarify:
This issue is significantly affecting my daily workflow, so I'm trying to understand if I should:
Thank you for your help!
DanTup commentedon Jan 30, 2026
@khusantoy I would expect the fix to be in the current beta SDKs, and therefore also in the next (non-hotfix) stable release SDK. If you test out the beta and find it's not working there, please do let me know.
Unfortunately I don't know a way to work around this while on the current stable.