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Issue 879792 link

Starred by 2 users
Status: Untriaged
Owner: ----
Components:
EstimatedDays: ----
NextAction: ----
OS: Fuchsia
Pri: 3
Type: Bug



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Switching to virtcon blocks threads on surface redraws

Project Member Reported by kmarshall@chromium.org, Aug 31 
As of rev 48e9d031,
 the following error spew is produce every 500ms whenever a blinking insertion cursor is present on a text field:

[01013.948] [986814:1765396677:0831/232554.821711:WARNING:scenic_window_canvas.cc(100)] Release fence from previous frame timed out after 500ms
[01014.460] [986814:1765396677:0831/232555.333479:WARNING:scenic_window_canvas.cc(100)] Release fence from previous frame timed out after 500ms
[01014.976] [986814:1765396677:0831/232555.850104:WARNING:scenic_window_canvas.cc(100)] Release fence from previous frame timed out after 500ms
[01015.493] [986814:1765396677:0831/232556.366718:WARNING:scenic_window_canvas.cc(100)] Release fence from previous frame timed out after 500ms

Comment 1 by w...@chromium.org, Aug 31 

That looks like a pretty serious issue, since it implies that we're blocking for 500ms at that point!

Comment 2 by kmarshall@chromium.org, Sep 19

Summary: Switching to virtcon blocks threads on surface redraws (was: Blinking text cursor produces frame sync timeout warnings)
OK, refined the repro steps:
1) Give input focus to a text field. There should be a blinking cursor.
2) Press WIN key to switch to virtcon.
3) Observe error spew.

We might want to consider suppressing or enabling redraws based on whether Scenic is visible.
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