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Old 06-16-2016, 08:48 PM   #1
jbobspants
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Join Date: Jun 2016
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Default Very slow refresh (1fps) with certain applications

I'm running Fedora 23 with mate and xmonad, using a USB monitor for dual or triple screens, and everything works great, for the most part. The mouse cursor moves fluidly on the USB screen, no artifacts or flickering, and Firefox scrolls smoothly. However, certain applications (notably screensaver and glxgears) have horrible refresh rates. I can start glxgears on my built-in laptop screen and it runs at about 60fps. As soon as I move it over to the USB screen, it drops down to 1fps. The interesting thing is if I drag the window so half of it shows on each monitor, it runs smoothly at 60fps on both halves.

It works the same if I have multiple instances of glxgears running at once. All instances on the USB screen move at 1fps, while all the ones on the built-in screen run at 60fps. Any windows that straddle both screens, even if only a tiny piece is on the built-in screen, will run at 60fps.

I'm sure others are seeing this behavior, too. Is it something specific to DisplayLink? Does it have to do with the way Linux treats the different framebuffers?

Edit: Wanted to add that I'm currently on driver version 1.1.65 with kernel 4.5.6, but I had the same slow screensaver behavior when I was on 1.0.138 and kernel 4.4.9.

I'll be happy to provide any additional troubleshooting details and output.

Thanks!

Last edited by jbobspants; 06-16-2016 at 08:55 PM.
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