Low framerate/lag with external screen after resume

asked 2018-02-16 15:09:42 +0000

theonlyandy gravatar image

I'd like to analyze my issue further but I don't know how, maybe you can point me in directions?

I'm using a rather big screen with 3440×1440 on Mini-DP, which Wayland can not handle together with my internal screen on my Inter graphics card (there's blackouts). That's why I'm using the external screen only.

Everything works smoothly, dragging windows around even while video is playing is no problem at all.

Now, when I put my laptop to sleep and resume (maybe on battery), suddenly it feels laggy. I notice when moving windows around, and that I have difficulties hitting buttons with the mouse.

When I unplug the external screen, on my internal 1600×900 it feels smooth again. I'm not sure whether re-plugging the external one solved the issue, since it's a quite subtle effect.

I'd like to know how I can measure framerate, to make sure what the problem actually is. I wanted to file a bug report in Gnome bugs, but I don't know which package to report to.

lspci lists my graphics controller as

00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)

I'm having a T430i, which should have a Intel HD Graphics 4000, and a Intel® Core™ i5-3320M CPU @ 2.60GHz × 4

Maybe it also has to do with Screen Settings lost after logging in from lock screen?

Thanks for help!

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