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I have installed the flatpak version of evince, and because it is the former elementary document viewer it looks like the flatpak version takes the responsability of creating thumbnails, but while I browse files with the pantheon files application, the processor overheats if there are a lot of files into the folder, and dmesg command always returns a lot of lines like this:

audit: type=1400 audit(1577484935.935:59): apparmor="DENIED" operation="open" profile="/usr/bin/evince-thumbnailer" name="/var/lib/flatpak/exports/share/mime/mime.cache" pid=25977 comm="evince-thumbnai" requested_mask="r" denied_mask="r" fsuid=1001 ouid=0

Maybe I am wrong, but it looks like apparmor denies evince to accept the mimecache file and as a result all thumbnails are recreated every time I open the folder - if there are a lot of images in it I can see them with the default jpg icon for a while following the thumbnail previews. Uninnstalling the flatpak version of the app do not remove the problem - I can see new similar lines when I type dmesg into terminal, always incliding the flatpak mime.cache path while I am browsing with the pantheon files application. It looks like there are two options - 1. To change the system thumbnailer program to be the default Document viewer or 2. to configure apparmor to grant access to the flatpak version to the mime.cache file but I do not know how to achieve neighter one of both. Anybody can help?

  • Maybe an issue should be raised here gitlab.gnome.org/groups/GNOME/-/…? – Jeremy Wootten Dec 30 '19 at 18:30
  • There is a similar issue on the same place, from another elementary OS user, and it was closed, because the XDG_DATA_DIRS variable is set correctly, which means that the problem should be on elementary OS itself. I have checked my XDG_DATA_DIRS output and it is also set correctly. So I am struggling to understand how apparmor works, because uninstalling all flatpak applications do not remove the lines above. – Bo rislav Dec 30 '19 at 18:34

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