Cristian Baica [:cbaica], Release Desktop QA Reporter
	Description • 6 years ago

[Affected versions]:
- Fx65.0a1
- Fx64.0b13
- Fx63.0.3


[Affected platforms]:
- Windows 7 x64

[Steps to reproduce]:
1. Launch Firefox.
2. Go to http://wwwns.akamai.com/hdnetwork/demo/flash/default.html 
3. Allow website to use Flash in order for the video to play.
4. Click the Full-Screen button.
5. Exit the Full-Screen using esc button on the keyboard.

[Expected result]:
- The transition to full screen and back should be done without any issues.

[Actual result]:
- My second screen and main screen flicker when entering and exiting full-screen.

[Regression range]:
- Will come back with a regression range ASAP.

[Additional notes]:
- When turning layers.acceleration.disable to 'true', the issue does not occur anymore (needs a browser retart to apply the new value).
- I have an IntelHD Graphics 530 integrated video card and using 2 dell monitors.
- Entering full screen also re-positions the mouse cursor on the main screen.

	Dan Minor [:dminor]
	Comment 1 • 6 years ago

If layers.acceleration.disable has an effect on this, this may be a graphics bug.

	Cristian Baica [:cbaica], Release Desktop QA Reporter
	Comment 2 • 6 years ago

Best I could narrow down the regression range to:

https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=b40ba117fa757861c9caa660ae989122718b494b&tochange=754b4805a65cab4f3aca99899227acc44ba4fb20

From that list bug 1217185 stands out as a possible cause for this.