Twinkling display bug on Win8 laptop with AMD 7650M

[rossant]

I have a display bug on a new Sony VAIO laptop with Windows 8 64 bits and an AMD Radeon HD 7650M GPU (tried with latest stable Catalyst driver and beta driver 13.200). In all examples, the window alternates between the background color and the scene (2-4 times per second). This bug does not occur on other graphics libraries (e.g. Galry).

[campagnola]

On all backends as well?

[almarklein]

This might be related to the autoswap functionality that I added this weekend. If you remove the call to swap_buffers(), is the effect gone?

[rossant]

@lcampagn Ah, good idea. I just tried spinning cube with different backends:

• pyglet: same issue
• glut: works great
• qt: same problem

[rossant]

@almarklein yes! removing the call to swap_buffers makes it it work on all backends. So this issue does not occur on any of your computers?

[almarklein]

I only tested on Linux. But all backends work ok. I was actually surprised, because I expected problems if you swap buffers twice.

Ok, so now we know that swapping buffers twice should be avoided. We could make Canvas.swap_buffers() only work if the autoswap flag is off, so that the examples would just work. But I think we should accept this "problem" and fix the examples as soon as we have a new release.

[almarklein]

@rossant Can we close this?

[rossant]

Is the auto-swap thing fixed on all machines? I think someone had an issue
yesterday on Windows during the sprint?

2013/8/26 Almar Klein notifications@github.com

@rossant https://github.com/rossant Can we close this?

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Reply to this email directly or view it on GitHubhttps://github.com//issues/25#issuecomment-23250234
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[almarklein]

Yeah, but the issue was that he was accidentally using an old installed vispy 0.1.0

[rossant]

Oh yes you're right! Anyway the examples work fine now, I guess we can close this.