[GNU/Linux] void pages sometimes

[nywka]

Same page:
https://files.catbox.moe/04iw7m.webp

After reload koreader:
https://files.catbox.moe/c8ty60.webp

Help please.

Log:
https://pastebin.com/S3gZBAUU

Thanks.

[NiLuJe]

Which platforms is that, because the ENOSYS in low-level input code, while unrelated to your broken PDF (because it is a broken PDF ), sounds fishy .

[everdred]

This (or something very similar) has actually happened to me as well. I could get it to reproduce on any PDF (but only with PDF files), and it would happen when I switched to another desktop workspace and then back to the one where KOReader was... the PDF content would appear for a brief moment before disappearing, and then would stay blank until the application was restarted. (Application menus/UI would appear, though.)

Here's where it started getting weird: I'm pretty sure it would only happen if I switched workspaces using keyboard shortcuts, as opposed to clicking the desktop pager, so I wasn't sure if it was specific to my switching shortcuts (Ctrl+Alt+J/K). Also, I think it may have only reproduced while switching workspaces in one of the two directions (prev/next workspace), so either only Ctrl+Alt+J or Ctrl+Alt+K. Finally, I'm pretty sure I saw the issue reproduce on both XFCE and KDE, as I've used similar layouts/workflows on both DEs.

The circumstances were so bizarre and specific that I felt I should try to diagnose the problem better before opening a Github issue. I haven't opened a PDF on amd64 KOReader in some time, but when I try now I'm having trouble making the issue reproduce (2022.07 on KDE).

I can let you know if I see it happen again...

[nywka]

>Which platforms is that?

```
nyawka@system ~ $ uname -a
Linux system 5.15.59-gentoo-x86_64 #1 SMP Sat Aug 6 16:54:36 EEST 2022 x86_64 AMD Ryzen 5 3400G with Radeon Vega Graphics AuthenticAMD GNU/Linux
```
This ok?

Version: 2022.07.
But I had same problem on another version.

>broken PDF.

I think it's not broken pdf, but it's problem with displaing document. I have this problem in different documents. After some time pages became blank.

Thanks.

[nywka]

This (or something very similar) has actually happened to me as well. I could get it to reproduce on any PDF (but only with PDF files), and it would happen when I switched to another desktop workspace and then back to the one where KOReader was... the PDF content would appear for a brief moment before disappearing, and then would stay blank until the application was restarted. (Application menus/UI would appear, though.)

Here's where it started getting weird: I'm pretty sure it would only happen if I switched workspaces using keyboard shortcuts, as opposed to clicking the desktop pager, so I wasn't sure if it was specific to my switching shortcuts (Ctrl+Alt+J/K). Also, I think it may have only reproduced while switching workspaces in one of the two directions (prev/next workspace), so either only Ctrl+Alt+J or Ctrl+Alt+K. Finally, I'm pretty sure I saw the issue reproduce on both XFCE and KDE, as I've used similar layouts/workflows on both DEs.

The circumstances were so bizarre and specific that I felt I should try to diagnose the problem better before opening a Github issue. I haven't opened a PDF on amd64 KOReader in some time, but when I try now I'm having trouble making the issue reproduce (2022.07 on KDE).

I can let you know if I see it happen again...

Thanks for adding your case in my topic. I use super ctrl h/j/k/l to change desktop and wayfire as wayland compositor (https://github.com/WayfireWm/wayfire).

[NiLuJe]

Can't tell much without verbose debug logs, then .

It's *plausible* there's a wonky resize event happening on desktop switch, which might be badly handled.

I barely ever use the emulator, so this is barely a shot in the dark, though .

[nywka]

>Emulator.
Thanks for guess. It's not emulator but native GNU/Linux appimage which I get from github releases (https://github.com/koreader/koreader/releases).

[pazos]

Originally Posted by nywka

>Emulator.
Thanks for guess. It's not emulator but native GNU/Linux appimage which I get from github releases (https://github.com/koreader/koreader/releases).

They're exactly the same, but the emulator emulates certain options not available in a generic sdl target. See https://github.com/koreader/koreader....lua#L108-L138

But yeah, both are using sdl in the input/output abstraction and they're all subject to the same bugs.

[Frenzie]

Originally Posted by NiLuJe

Can't tell much without verbose debug logs, then .

It's *plausible* there's a wonky resize event happening on desktop switch, which might be badly handled.

I barely ever use the emulator, so this is barely a shot in the dark, though .

I think it's more likely to be related to https://github.com/koreader/koreader/issues/9262

Edit: or something similar to https://github.com/koreader/koreader...f930d750e75116

[everdred]

Originally Posted by nywka

Thanks for adding your case in my topic. I use super ctrl h/j/k/l to change desktop and wayfire as wayland compositor (https://github.com/WayfireWm/wayfire).

In my case I was on X11, just using the default compositor for each DE.