Re: Plasma on Wayland

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On Mon, Jan 18, 2021 at 3:19 PM Adam Batkin <adam@xxxxxxxxxx> wrote:
> Since there is a plan to default Plasma to use Wayland, I thought I'd
> offer some feedback based on my testing over the past couple of weeks.
> I tested on two different systems, one with an NVidia video card (GTX
> 750 Ti, using the proprietary driver) and the other being a newer system
> with an AMD card (5600 XT, only stock Fedora drivers).
> On the NVidia system, the result was clear very early on: It was unusable.
> * The mouse cursor sometimes (usually?) had an almost-imperceptible
> lag/flicker as it moved, kinda like when one of those fluorescent lights
> is starting to die, and you can stare at it for as long as you want but
> you can't *see* the flicker, but you know it's happening, and now you
> have a migraine
> * Bits of Plasma would refuse to paint. For example KRunner (Alt+F2)
> would appear, sometimes I could type a letter or two, at which point it
> would appear to completely "freeze". Behind-the-scenes, it was still
> processing input, and I could arrow around and hit enter (having no idea
> what it was doing since I couldn't see anything) and it would launch
> whatever happened to be selected that I couldn't see. And next time I
> pressed Alt+F2, my previous text was pre-filled, so I knew it was
> working. There were other little Plasma things that worked similarly
> * Firefox and Thunderbird (X11-mode) worked, until suddenly they stopped
> working and turned into a big black box. Usually that was it until I
> rebooted, but sometimes if I resized something, I could get it to snap
> out of it and come back to life. Firefox with Wayland-mode was worse, as
> it would flash violently (even when not doing anything) - I assume
> trying to give someone a seizure.
> On to the AMD system. Things were "mostly" working, but I've still
> switched back to X11 because I need to get real work done.
> * I can't use CopyQ - oh well. I switched back to Klipper, which I
> hadn't used in like a decade. It's not terrible, and if this was my only
> issue, I'd survive
> * Something isn't right with the clipboard. Usually I'd copy something
> and then I could immediately paste it. But sometimes I'd paste and my
> clipboard was empty. So I'd Alt+Tab back to wherever I was, copy again,
> and then it would work. I did some searching, and there have been lots
> of complaints about clipboard issues like this going back 3+ years, with
> various different behaviors, suggested fixes, etc... but nothing
> concrete. Maybe it's a conflict with something klipper is doing (but
> honestly, if I can't use a clipboard manager at all, I can't use
> Wayland). Usually I'd copy from Firefox (X11) to a konsole terminal so
> that's where most of the "failures" happened, but once or twice it was
> from one konsole window to another (note: I use
> copy-to-clipboard-on-selection)
> * Some sort of kernel panic on startup, that didn't seem to affect
> functionality: (I
> haven't seen this again since switching back to X11)
> * Firefox: X11-mode is fine. Wayland-mode caused terrible flicker making
> it unusable
> * JetBrains products (i.e. Java/Swing-based, IntelliJ IDEA
> specifically): Everything mostly worked, except occasionally it would
> open a dialog (like a file selector) and the whole UI would appear to
> freeze (it's a modal dialog after all, but the dialog hadn't "appeared"
> yet so there was nothing I could interact with). I'd minimize the whole
> IDE and bring it back, and usually after that or some other similar
> black-magic incantation, when it restored, the dialog would be present
> and I could carry on. I don't have a specific way of reproducing this,
> and every time I'd go back and try to re-open the same exact dialog in
> the same way, it would be fine
> * The thing that finally got me to switch back was when, in the middle
> of compiling something, kwin_wayland crashed, killing the whole session.
> If I had to guess, it had something to do with the fact that it was
> painting/scrolling the konsole window VERY fast during compilation and
> it got angry. I tried using the oops reporter thing, but it complained
> about something not working, so I gave up. I've put the system under
> load for plenty of other things (and I can dual-boot to Windows and
> stress-test the system for an hour and it's fine with temps hovering
> around ambient)
> In summary: On my AMD-based system, Wayland is _almost_ there. But this
> combination of intermittent problems makes me hesitant to use it as my
> daily-driver. Life is good under X11 for me: things are fast and stable
> and boring, which is just perfect. I'm happy to do more testing (i.e.
> run for a couple days under Wayland) to do more testing at some point,
> but not for day-to-day work.

I believe chunks of this have already been fixed with Plasma 5.21, and
the beta release of Plasma 5.21 will be landing in Rawhide this week
as soon as the tarballs are generated.

That said, have you filed bugs at about this? That way
the upstream KDE developers can evaluate the specifics to see what's
been resolved so far and what needs work.

真実はいつも一つ!/ Always, there's only one truth!
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