Unable to take screenshot on Wayland session of KDE Plasma >5.80

[glaubersm]

Hi
I use ksnip 1.7.3 on neon unstable based on ubuntu 20.04.
ksnip is unable to take screenshot on Wayland session, I get a notification saying:
"The image could not be displayed. No image provided, but one was expected;"
Tested .deb and appimage packages.

[DamirPorobic]

Hello, has this worked before? I'll have a look into it this week.

[glaubersm]

I do not know if this issue is a regression or not. I had never tried to take screenshot on Wayland before.

[DamirPorobic]

I'll have a look into this soon hopefully. Meanwhile you could checkout latest continuous build that supports Generic Wayland Screenshots. Under KDE Plasma you will need to enabled the Force Generic Wayland Screenshot under Settings > Image Grabber. Maybe this works as a workaround for now.

[glaubersm]

Generic mode does not work on my system too.

[DamirPorobic]

That's strange. You using Plasma (Wayland) or Plasma (Full Wayland)?

[glaubersm]

My login manager has "Plasma" and "Plasma (Wayland)" options. I use "Plasma (Wayland)".

[DamirPorobic]

Tested now ksnip latest AppImage with KDE neon 5.19.5, both the KDE Specific and Generic Wayland, both work.

Can you tell me the exact version you're using?

[glaubersm]

Tested now appimage version 1.7.3 and got the same result.

[DamirPorobic]

With latest I mean 1.8.0, but I wasn’t expecting any change, I haven’t changed anything in code yet. What KDE Neon version do you use?

…

________________________________ From: Strangiato <notifications@github.com> Sent: Sunday, October 11, 2020 9:44:43 PM To: ksnip/ksnip <ksnip@noreply.github.com> Cc: Damir Porobic <damir_porobic@live.com>; Assign <assign@noreply.github.com> Subject: Re: [ksnip/ksnip] Unable to take screenshot on Wayland session of KDE Plasma (#424) Tested now appimage version 1.7.3 and got the same result. — You are receiving this because you were assigned. Reply to this email directly, view it on GitHub<#424 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/ADBUCTDH3O3SV5O4IELV6P3SKIDKXANCNFSM4RUOKU7A>.

[glaubersm]

I use neon unstable edition. I have another computer runnng Arch Linux + KDE Plasma 5.20 beta, I have just tested the same appimage there and got the same result.
EDIT: continuous build of ksnip 1.8.0 also gives me the error message.

[DamirPorobic]

Ok, might be something with the latest KDE Plasma release. I'll try setting up my test notebook with KDE Neon Unstable. It's this one:

[DamirPorobic]

I was able to reproduce the issue with KDE Neon Unstable. It looks like a change in KDE Plasma (>5.80) that requires now processes to be authorized to take screenshots. I'm checking with the KDE developers what's this all about an how to get authorized.

[DamirPorobic]

While I'm still checking with the KDE folks for a solution, there seems to be a workaround for the generic screenshots using XDG Portal. Adding X-KDE-DBUS-Restricted-Interfaces=org.kde.kwin.Screenshot to /usr/share/applications/org.freedesktop.impl.portal.desktop.kde.desktop and then restarting, makes the Generic Screenshots work again.