Basically the description. I have a comic collection and it used to have thumbnails but now that I navigated to it they all vanished right in front of my eyes.
Not sure when it broke exactly as i haven’t attended to it in a year or so but all of the other thumbnails like movies, images, pdf etc, work just fine.
Not sure what kind of groundbreaking advances in thumbnailing technology necessitated changing what was working perfectly fine yet here we are.
Xfce and Thunar are ver. 4.20 everything is up to date.
I’ve purged cache, made sure that mime types are correctly assigned.
[alex@Desktop Isola]$ pkill -f tumbler
[alex@Desktop Isola]$ rm -rf ~/.cache/tumbler
[alex@Desktop Isola]$ rm -rf ~/.cache/thumbnails
[alex@Desktop Isola]$ pkill tumblerd
[alex@Desktop Isola]$ G_MESSAGES_PREFIXED= G_MESSAGES_DEBUG=all /usr/lib/tumbler-1/tumblerd --replace
tumbler-cover-thumbnailer-DEBUG: 12:35:21.706: Initializing the Tumbler Cover Thumbnailer plugin
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.706: Initializing the Tumbler Desktop Thumbnailer plugin
tumbler-ffmpeg-thumbnailer-DEBUG: 12:35:21.780: Initializing the Tumbler ffmpeg video thumbnailer plugin
tumbler-font-thumbnailer-DEBUG: 12:35:21.781: Initializing the Tumbler Font Thumbnailer plugin
tumbler-gepub-thumbnailer-DEBUG: 12:35:21.844: Initializing the Tumbler Gepub Thumbnailer plugin
tumbler-jpeg-thumbnailer-DEBUG: 12:35:21.845: Initializing the Tumbler JPEG Thumbnailer plugin
tumbler-odf-thumbnailer-DEBUG: 12:35:21.846: Initializing the Tumbler ODF Thumbnailer plugin
tumbler-pixbuf-thumbnailer-DEBUG: 12:35:21.846: Initializing the Tumbler Pixbuf Thumbnailer plugin
tumbler-poppler-thumbnailer-DEBUG: 12:35:21.856: Initializing the Tumbler Poppler PDF/PS Thumbnailer plugin
tumbler-raw-thumbnailer-DEBUG: 12:35:21.858: Initializing the Tumbler RAW Thumbnailer plugin
tumbler-DEBUG: 12:35:21.858: Thumbnailer “CoverThumbnailer” disabled in config file
tumbler-cover-thumbnailer-DEBUG: 12:35:21.858: Shutting down the Tumbler Cover Thumbnailer plugin
tumbler-raw-thumbnailer-DEBUG: 12:35:21.858: Supported URI schemes:
file
tumbler-raw-thumbnailer-DEBUG: 12:35:21.858: Supported mime types:
image/x-adobe-dng
image/x-canon-cr2
image/x-canon-crw
image/x-epson-erf
image/x-nikon-nef
image/x-nikon-nrw
image/x-olympus-orf
image/x-panasonic-raw
image/x-panasonic-rw2
image/x-pentax-pef
image/x-sony-arw
image/x-minolta-mrw
image/x-fuji-raf
GLib-GIO-DEBUG: 12:35:21.862: _g_io_module_get_default: Found default implementation gvfs (GDaemonVfs) for ‘gio-vfs’
tumbler-poppler-thumbnailer-DEBUG: 12:35:21.862: Supported URI schemes:
file
ftps
ftpis
ftp
archive
afp
admin
smb
mtp
gphoto2
afc
trash
sftp
ssh
recent
resource
tumbler-poppler-thumbnailer-DEBUG: 12:35:21.862: Supported mime types:
application/pdf
application/postscript
tumbler-pixbuf-thumbnailer-DEBUG: 12:35:21.863: Supported URI schemes:
file
ftps
ftpis[alex@Desktop Isola]$ pkill -f tumbler
[alex@Desktop Isola]$ rm -rf ~/.cache/tumbler
[alex@Desktop Isola]$ rm -rf ~/.cache/thumbnails
[alex@Desktop Isola]$ pkill tumblerd
[alex@Desktop Isola]$ G_MESSAGES_PREFIXED= G_MESSAGES_DEBUG=all /usr/lib/tumbler-1/tumblerd --replace
tumbler-cover-thumbnailer-DEBUG: 12:35:21.706: Initializing the Tumbler Cover Thumbnailer plugin
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.706: Initializing the Tumbler Desktop Thumbnailer plugin
tumbler-ffmpeg-thumbnailer-DEBUG: 12:35:21.780: Initializing the Tumbler ffmpeg video thumbnailer plugin
tumbler-font-thumbnailer-DEBUG: 12:35:21.781: Initializing the Tumbler Font Thumbnailer plugin
tumbler-gepub-thumbnailer-DEBUG: 12:35:21.844: Initializing the Tumbler Gepub Thumbnailer plugin
tumbler-jpeg-thumbnailer-DEBUG: 12:35:21.845: Initializing the Tumbler JPEG Thumbnailer plugin
tumbler-odf-thumbnailer-DEBUG: 12:35:21.846: Initializing the Tumbler ODF Thumbnailer plugin
tumbler-pixbuf-thumbnailer-DEBUG: 12:35:21.846: Initializing the Tumbler Pixbuf Thumbnailer plugin
tumbler-poppler-thumbnailer-DEBUG: 12:35:21.856: Initializing the Tumbler Poppler PDF/PS Thumbnailer plugin
tumbler-raw-thumbnailer-DEBUG: 12:35:21.858: Initializing the Tumbler RAW Thumbnailer plugin
tumbler-DEBUG: 12:35:21.858: Thumbnailer “CoverThumbnailer” disabled in config file
tumbler-cover-thumbnailer-DEBUG: 12:35:21.858: Shutting down the Tumbler Cover Thumbnailer plugin
tumbler-raw-thumbnailer-DEBUG: 12:35:21.858: Supported URI schemes:
file
tumbler-raw-thumbnailer-DEBUG: 12:35:21.858: Supported mime types:
image/x-adobe-dng
image/x-canon-cr2
image/x-canon-crw
image/x-epson-erf
image/x-nikon-nef
image/x-nikon-nrw
image/x-olympus-orf
image/x-panasonic-raw
image/x-panasonic-rw2
image/x-pentax-pef
image/x-sony-arw
image/x-minolta-mrw
image/x-fuji-raf
GLib-GIO-DEBUG: 12:35:21.862: _g_io_module_get_default: Found default implementation gvfs (GDaemonVfs) for ‘gio-vfs’
tumbler-poppler-thumbnailer-DEBUG: 12:35:21.862: Supported URI schemes:
file
ftps
ftpis
ftp
archive
afp
admin
smb
mtp
gphoto2
afc
trash
sftp
ssh
recent
resource
tumbler-pixbuf-thumbnailer-DEBUG: 12:35:21.863: Supported mime types:
image/webp
image/x-olympus-orf
image/x-exr
image/jxl
image/x-win-bitmap
image/x-bmp
image/vnd.adobe.svg+xml
image/x-sony-arw
image/x-ico
image/heif
image/tiff
image/gif
image/png
image/x-epson-erf
image/svg+xml-compressed
image/qoi
image/x-xpixmap
image/icon
image/x-dds
image/x-nikon-nef
image/x-fuji-raf
image/svg+xml
image/x-MS-bmp
image/x-xbitmap
image/x-adobe-dng
image/svg
image/qtif
text/ico
image/x-portable-graymap
image/vnd.microsoft.icon
image/x-canon-crw
image/x-icon
image/x-icns
image/x-portable-anymap
image/x-pentax-pef
text/xml-svg
image/x-minolta-mrw
image/heic
image/x-tga
image/jpeg
image/x-portable-pixmap
application/ico
image/x-qoi
image/bmp
application/x-navi-animation
image/avif
image/ico
image/x-portable-bitmap
image/x-quicktime
image/raw
image/svg-xml
image/x-wmf
image/x-canon-cr2
tumbler-odf-thumbnailer-DEBUG: 12:35:21.864: Supported URI schemes:
file
ftps
ftpis
ftp
archive
afp
admin
smb
mtp
gphoto2
afc
trash
sftp
ssh
recent
resource
tumbler-odf-thumbnailer-DEBUG: 12:35:21.864: Supported mime types:
application/vnd.ms-powerpoint
application/vnd.openxmlformats-officedocument.presentationml.presentation
application/vnd.ms-excel
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
application/msword
application/vnd.openxmlformats-officedocument.wordprocessingml.document
application/vnd.oasis.opendocument.presentation-template
application/vnd.oasis.opendocument.presentation
application/vnd.oasis.opendocument.spreadsheet-template
application/vnd.oasis.opendocument.spreadsheet
application/vnd.oasis.opendocument.text-template
application/vnd.oasis.opendocument.text-master
application/vnd.oasis.opendocument.text
application/vnd.oasis.opendocument.graphics-template
application/vnd.oasis.opendocument.graphics
application/vnd.oasis.opendocument.chart
application/vnd.oasis.opendocument.image
application/vnd.oasis.opendocument.formula
application/vnd.sun.xml.impress.template
application/vnd.sun.xml.impress.template
application/vnd.sun.xml.impress
application/vnd.sun.xml.calc.template
application/vnd.sun.xml.calc
application/vnd.sun.xml.writer.global
application/vnd.sun.xml.writer.template
application/vnd.sun.xml.writer
application/vnd.sun.xml.draw.template
application/vnd.sun.xml.draw
application/vnd.sun.xml.math
image/openraster
tumbler-jpeg-thumbnailer-DEBUG: 12:35:21.864: Supported URI schemes:
file
ftps
ftpis
ftp
archive
afp
admin
smb
mtp
gphoto2
afc
trash
sftp
ssh
recent
resource
tumbler-jpeg-thumbnailer-DEBUG: 12:35:21.864: Supported mime types:
image/jpeg
tumbler-gepub-thumbnailer-DEBUG: 12:35:21.864: Supported URI schemes:
file
ftps
ftpis
ftp
archive
afp
admin
smb
mtp
gphoto2
afc
trash
sftp
ssh
recent
resource
tumbler-gepub-thumbnailer-DEBUG: 12:35:21.864: Supported mime types:
application/epub
application/epub+zip
tumbler-font-thumbnailer-DEBUG: 12:35:21.864: Supported URI schemes:
file
ftps
ftpis
ftp
archive
afp
admin
smb
mtp
gphoto2
afc
trash
sftp
ssh
recent
resource
tumbler-font-thumbnailer-DEBUG: 12:35:21.864: Supported mime types:
application/x-font-otf
application/x-font-pcf
application/x-font-ttf
application/x-font-type1
tumbler-ffmpeg-thumbnailer-DEBUG: 12:35:21.865: Supported URI schemes:
file
ftps
ftpis
ftp
archive
afp
admin
smb
mtp
gphoto2
afc
trash
sftp
ssh
recent
resource
tumbler-ffmpeg-thumbnailer-DEBUG: 12:35:21.865: Supported mime types:
video/3gpp
video/3gpp2
video/annodex
video/dv
video/isivideo
video/mj2
video/mp2t
video/mp4
video/mpeg
video/ogg
video/quicktime
video/vnd.avi
video/vnd.mpegurl
video/vnd.radgamettools.bink
video/vnd.radgamettools.smacker
video/vnd.rn-realvideo
video/vnd.vivo
video/vnd.youtube.yt
video/wavelet
video/webm
video/x-anim
video/x-flic
video/x-flv
video/x-javafx
video/x-matroska
video/x-matroska-3d
video/x-mjpeg
video/x-mng
video/x-ms-wmv
video/x-nsv
video/x-ogm+ogg
video/x-sgi-movie
video/x-theora+ogg
application/mxf
application/vnd.ms-asf
application/vnd.rn-realmedia
application/x-matroska
application/ogg
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.865: Supported URI schemes:
file
ftps
ftpis
ftp
archive
afp
admin
smb
mtp
gphoto2
afc
trash
sftp
ssh
recent
resource
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.866: Registered thumbnailer ‘/usr/share/thumbnailers/glycin-svg.thumbnailer’
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.866: Supported mime types:
image/svg+xml
image/svg+xml-compressed
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.866: Registered thumbnailer ‘/usr/share/thumbnailers/comicthumb.thumbnailer’
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.866: Supported mime types:
application/vnd.comicbook-rar
application/vnd.comicbook+zip
application/x-cb7
application/x-cbt
application/pdf
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.866: Registered thumbnailer ‘/usr/share/thumbnailers/glycin-heif.thumbnailer’
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.866: Supported mime types:
image/avif
image/heif
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.866: Registered thumbnailer ‘/usr/share/thumbnailers/glycin-image-rs.thumbnailer’
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.866: Supported mime types:
image/jpeg
image/png
image/apng
image/gif
image/webp
image/tiff
image/x-tga
image/vnd-ms.dds
image/x-dds
image/bmp
image/vnd.microsoft.icon
image/x-exr
image/x-portable-bitmap
image/x-portable-graymap
image/x-portable-pixmap
image/x-portable-anymap
image/x-qoi
image/qoi
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.866: Registered thumbnailer ‘/usr/share/thumbnailers/glycin-jxl.thumbnailer’
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.866: Supported mime types:
image/jxl
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.866: Registered thumbnailer ‘/usr/share/thumbnailers/heif.thumbnailer’
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.866: Supported mime types:
image/heif
image/avif
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.866: Registered thumbnailer ‘/usr/share/thumbnailers/gsf-office.thumbnailer’
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.866: Supported mime types:
application/msword
application/vnd.ms-excel
application/vnd.ms-powerpoint
application/vnd.oasis.opendocument.chart
application/vnd.oasis.opendocument.formula
application/vnd.oasis.opendocument.graphics
application/vnd.oasis.opendocument.graphics-template
application/vnd.oasis.opendocument.image
application/vnd.oasis.opendocument.presentation
application/vnd.oasis.opendocument.presentation-template
application/vnd.oasis.opendocument.spreadsheet
application/vnd.oasis.opendocument.spreadsheet-template
application/vnd.oasis.opendocument.text
application/vnd.oasis.opendocument.text-master
application/vnd.oasis.opendocument.text-template
application/vnd.openxmlformats-officedocument.presentationml.presentation
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
application/vnd.openxmlformats-officedocument.wordprocessingml.document
application/vnd.sun.xml.calc
application/vnd.sun.xml.calc.template
application/vnd.sun.xml.draw
application/vnd.sun.xml.draw.template
application/vnd.sun.xml.impress
application/vnd.sun.xml.impress.template
application/vnd.sun.xml.math
application/vnd.sun.xml.writer
application/vnd.sun.xml.writer.global
application/vnd.sun.xml.writer.template
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.866: Registered thumbnailer ‘/usr/share/thumbnailers/ffmpegthumbnailer.thumbnailer’
tumbler-desktop-thumbnailer-DEBUG: 12:35:21.866: Supported mime types:
video/3gpp
video/3gpp2
video/annodex
video/dv
video/isivideo
video/mj2
video/mp2t
video/mp4
video/mpeg
video/ogg
video/quicktime
video/vnd.avi
video/vnd.mpegurl
video/vnd.radgamettools.bink
video/vnd.radgamettools.smacker
video/vnd.rn-realvideo
video/vnd.vivo
video/vnd.youtube.yt
video/wavelet
video/webm
video/x-anim
video/x-flic
video/x-flv
video/x-javafx
video/x-matroska
video/x-matroska-3d
video/x-mjpeg
video/x-mng
video/x-ms-wmv
video/x-nsv
video/x-ogm+ogg
video/x-sgi-movie
video/x-theora+ogg
application/mxf
application/vnd.ms-asf
application/vnd.rn-realmedia
application/x-matroska
application/ogg
tumbler-xdg-cache-DEBUG: 12:35:21.871: Initializing the Tumbler XDG cache plugin
tumblerd-DEBUG: 12:35:21.894: Ready to handle requests
>
tumblerd-DEBUG: 12:36:55.019: Handling request 1
tumblerd-DEBUG: 12:36:55.019: URIs | Mime types:
file:///home/alex/Downloads/Comics/Isola/Isola%20%2301.cbr | application/vnd.comicbook-rar
tumblerd-DEBUG: 12:36:55.019: Starting job 1
tumbler-desktop-thumbnailer-DEBUG: 12:36:55.020: ‘Exec=comicthumb %i %o %s’: Handling URI ‘file:///home/alex/Downloads/Comics/Isola/Isola%20%2301.cbr’
2025-12-29T09:36:55.959096Z DEBUG glycin::gobject: Initialized logging
2025-12-29T09:36:55.959809Z DEBUG glycin::sandbox: Testing bwrap availability with: “bwrap” “–unshare-all” “–die-with-parent” “–chdir” “/” “–ro-bind” “/usr” “/usr” “–dev” “/dev” “–ro-bind-try” “/etc/ld.so.cache” “/etc/ld.so.cache” “–ro-bind-try” “/nix/store” “/nix/store” “–tmpfs” “/tmp-home” “–tmpfs” “/tmp-run” “–clearenv” “–setenv” “HOME” “/tmp-home” “–setenv” “XDG_RUNTIME_DIR” “/tmp-run” “–setenv” “XDG_RUNTIME_DIR” “/run/user/1000” “–symlink” “/usr/lib” “/lib” “–symlink” “/usr/lib” “/lib64” “–seccomp” “8” “/usr/bin/true”
2025-12-29T09:36:55.978355Z DEBUG glycin::sandbox: bwrap availability test returned: Output { status: ExitStatus(unix_wait_status(0)), stdout: “”, stderr: “Setting process memory limitn” } (Signal: None, Code: Some(0))
2025-12-29T09:36:55.978414Z DEBUG glycin::sandbox: bwrap sandboxing available: true
2025-12-29T09:36:55.978428Z DEBUG glycin::pool: No existing loader/editor in pool. Spawning new one.
2025-12-29T09:36:55.979296Z DEBUG glycin::dbus: Spawning loader/editor:
“bwrap” “–unshare-all” “–die-with-parent” “–chdir” “/” “–ro-bind” “/usr” “/usr” “–dev” “/dev” “–ro-bind-try” “/etc/ld.so.cache” “/etc/ld.so.cache” “–ro-bind-try” “/nix/store” “/nix/store” “–tmpfs” “/tmp-home” “–tmpfs” “/tmp-run” “–clearenv” “–setenv” “HOME” “/tmp-home” “–setenv” “XDG_RUNTIME_DIR” “/tmp-run” “–setenv” “XDG_RUNTIME_DIR” “/run/user/1000” “–symlink” “/usr/lib” “/lib” “–symlink” “/usr/lib” “/lib64” “–seccomp” “9” “/usr/lib/glycin-loaders/2+/glycin-image-rs” “–dbus-fd” “8”
2025-12-29T09:36:55.988991Z DEBUG glycin::dbus: Loader stderr: Setting process memory limit
GLib-GIO-DEBUG: 12:36:56.010: _g_io_module_get_default: Found default implementation gvfs (GDaemonVfs) for ‘gio-vfs’
tumblerd-DEBUG: 12:36:56.089: Error signal for job 1: Code 8, message: (domain gdk-pixbuf-error-quark, code 3) Unrecognized image file format
tumblerd-DEBUG: 12:36:56.089: URIs:
file:///home/alex/Downloads/Comics/Isola/Isola%20%2301.cbr
tumblerd-DEBUG: 12:36:56.089: Finishing job 1
If I generate a thumbnail with
comicthumb “Isola #01.cbr” /tmp/test.png 256
It generates the picture just fine in whatever resolution.
Do I give up on my collection looking pretty?
Mod edit: corrected your formatting. Please use proper code tags, not quote tags.