Created attachment 6872
Screenshot of bug in action. Parts of Konsole and Thunderbird have redrawn.
I've had this issue for quite a while now. Every so often (I've managed to track it down to when I minimize Firefox) the contents of my screen will be overwritten with something that was on my screen before. When things redraw, they'll redraw over this restored buffer, but usually it'll quickly revert to the bad buffer.
Typically this buffer is just the Xscreensaver lock screen, but sometimes it's something I was working on any time from a few minutes ago to a few hours ago. It's all very random and sporadic, from the contents of this buffer to when it appears and how frequently it redraws. (For instance, sometimes it reverts to the bad buffer after about 30 seconds, but other times it reverts almost instantly, making the computer almost unusable.) In the screenshot, despite triggering this bug at ~7:19 PM, the screenshot shows an Xscreensaver time of 6:10 PM.
I am running xfwm 4.12.2 on OpenSUSE Tumbleweed (Linux linux-3mc6 4.7.5-1-default #1 SMP PREEMPT Mon Sep 26 08:11:45 UTC 2016 (02c4d35) x86_64 x86_64 x86_64 GNU/Linux) using the nouveau drivers with a Nvidia Quadro 2800M (NV92). This issue does not occur with KDE Plasma 5.x or icewm.
Do you have compositing enabled? What if you disable it?
Can you try with another driver (modesetting)?
Sorry for the delay. I can't seem to reproduce the bug right now. I did also clear my profile, so maybe that helped. You can probably close this bug.
I confirm experiencing this issue for a couple of years without a change. I've just resigned to be used to it however I'd be glad if there's a definite solution.
Here's what I observed when compositing is enabled AND using nouveau video driver:
- screen buffer appears whenever a video plays in a web browser or when I run parole media player AND
- I switch to another virtual desktop AND
- there's an application displayed full-screen
The issue appears immediately when parole is active, even iconized. It can however take from a fraction of a second to a few seconds when a web browser is active.
This issue is reproducible systematically under these circumstances. If I disable the compositor, the issue is gone. (But then what's the point of having such a video card...)
I posted a message with screenshots in Xfce forum a couple of years ago (https://forum.xfce.org/viewtopic.php?pid=53168) . Still pending.
Maybe try disabling fullscreen overlay windows? (in `xfwm4-tweaks-settings`, “compositor” → uncheck “Display fullscreen overlay windows directly”)
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