Fairly fresh install of MATE 18.04 in MBP '09 . . . overall working well, but lately noticing that the bottom panel will “flicker” when scrolling down through some web page, or, also as a web page is loading . . . once the page has loaded the flickering stops . . . . Seemed like if more than one app is loaded and showing in the panel the problem is “less” . . . . It’s not a show stopper, but, somewhat irritating . . . .
I saw another thread entitled “Panel flickering” in 16.04, and I read through it, some of the posters were mentioning “window compositor” in MATE Tweaks . . . but I couldn’t exactly figure out what they wanted the OP to do with it . . . . Funny, problem is “happening” now as I’m typing this post . . . each key stroke makes the panel “shake” . . . .
Window Manager is set to "Marco (adaptive compositor) . . . which is possibly the default, I don’t think I changed it or set it . . . should I just pick another one and see what happens?
Even “funnier” now while I’m typing the panel is not shaking . . . so problem seems to come and go???
Thanks very kindly for the reply . . . it’ll be a day or three before I get back to that computer to check it out, but I’ll post back on the update . . . looks simple enough to try (Compton GPU Compositor) . . . . I do have another install of U -MATE 18.04 on the home computer that I’m using now, but I haven’t noticed this issue on it . . . . Have to check it out . . . .
Yep. Comparing the two installs of U-MATE between 09 MBP and 12 MP . . . the desktop version is also using “Marco (adaptive compositor)” and this flickering panel thing isn’t happening . . . ??? Both have Nvidia cards, and on this desktop the proprietary nvidia drivers are being used . . . .
Only difference might be that the home computer is connected by ethernet, and the laptop was connected to what was a slow wifi connection and web pages seemed to load “slowly” whereas at home it’s a fairly “fast” service?? I was trying to replicate what was happening at work, i.e., scrolling in web page . . . so far doesn’t seem to be happening in what should be roughly the “same” operating system and version, 18.04 + recent updates, etc.
OK, back over in the offending MBP . . . in the meanwhile I changed the home computer to Marco(Compton) as well . . . since there hadn’t been a problem I wouldn’t say it made a difference, but nothing got worse.
In the laptop, this morning before changing to Compton the “flickering/horizontally split” panel thing was again still happening . . . changing to Compton did improve the situation, the panel now kind of “vibrates” with activity . . . keystrokes, loading of windows, or just sitting looking at the screen the optional Desktop(s) area on the right end of the panel are “pulsing” . . . . Whereas, before changing the window manager to Compton, the whole panel would flicker, but the panel would “split” . . . which just now after several minutes has started happening again . . . .
So, I guess I would have to say that the problem is still happening . . . after changing the WM I logged out, then back in . . . things seemed “better” but now . . . it returns to horizontal splitting of the panel in a flickering manner . . . .
No further thoughts on the issue? Would this issue qualify as worthy of a bug report? Problem persists in spite of changing WM . . . would this be a general bug or a specific to mate-panel type bug??
When I had the problem I was using an AMD card and changing WM fixed it. As you are using NVIDIA I don't know whether it's a general bug or or the specific one you mention. It might be very well be worth sending a bug report in my humble opinion.
Regards.
Thanks for the reply, it is a bit "interesting" as my desktop is also now Nvidia and doesn't have this problem, but the laptop install does, with OEM Nvidia card circa '09 . . . . It's the kind of problem that creates a visual distraction . . . and does render the lower panel less functional . . . .
I just upgraded to UbuntuMATE 22.04 LTS, and I am seeing the flickering of elements of the UbuntuMATE community pageposting my Firefox browser (128.0 64-bit).
It is infrequent, but very annoying when it happens.
I captured a video with my camera on a stand. It clearly shows only elements in the right frame flickering, while the left frame is stable without flickering.
Any ideas on
what is the problem?
how to fix?
I can upload that to video to wherever it may be desired.
Doesn't seem like too much response here, as the OP at that time I think I probably wiped the UM install and went to another OS to solve the problem?? That's what I did at that time, I think that machine now is running Manjaro?
But, recently in one or two of my openSUSE installs I had problems with FF playing videos with jerky motion that might relate to you problem and I got a couple of suggestions, including changing FF to the snaps option, which didn't fix the problem . . . . Ubuntu I think is using the snaps option for FF, not sure if UM is . . . .
The solution that did work was to "install package 'opi' and then run a command to activate it?? You'd have to check it out thoroughly, as SUSE is built on Fedora and uses rpm format and UM is built on ubuntu, stacked on Debian using deb files . . . .
But, there are a lot of overlaps in linux, especially on commands and packages to do stuff . . . it might be exactly what caused the problem back in '19 in UM and in SUSE's FF a few months back . . . ??? Sometimes bugs float around in linux for years . . . appearing willy-nilly, etc.
