https://bugs.kde.org/show_bug.cgi?id=451408

--- Comment #46 from Marek <marek.schim...@gmail.com> ---
I'm sorry, I will open a new bug if needed. I found this one when searching for
a solution for my missing thumbnails, it looked pretty similar - and the
workaround worked. Anyway, here's the requested info:

$ udisksctl info -b /dev/sda1

/org/freedesktop/UDisks2/block_devices/sda1:
  org.freedesktop.UDisks2.Block:
    Configuration:              [('fstab', {'fsname': <b'/dev/sda1'>, 'dir':
<b'/mnt/ext_disk1'>, 'type': <b'xfs'>, 'opts':
<b'noatime,nodiratime,nofail,users'>, 'freq': <0>, 'passno': <0>})]
    CryptoBackingDevice:        '/'
    Device:                     /dev/sda1
    DeviceNumber:               2049
    Drive:                     
'/org/freedesktop/UDisks2/drives/SanDisk_Extreme_55AE_32353031314B343031333435'
    HintAuto:                   true
    HintIconName:               
    HintIgnore:                 false
    HintName:                   
    HintPartitionable:          true
    HintSymbolicIconName:       
    HintSystem:                 false
    Id:                        
by-id-usb-SanDisk_Extreme_55AE_32353031314B343031333435-0:0-part1
    IdLabel:                    Data
    IdType:                     xfs
    IdUUID:                     8f7eec48-4e3b-4257-b898-dac4c66f4d83
    IdUsage:                    filesystem
    IdVersion:                  
    MDRaid:                     '/'
    MDRaidMember:               '/'
    PreferredDevice:            /dev/sda1
    ReadOnly:                   false
    Size:                       1800321105920
    Symlinks:                   /dev/disk/by-diskseq/1-part1
                               
/dev/disk/by-id/usb-SanDisk_Extreme_55AE_32353031314B343031333435-0:0-part1
                                /dev/disk/by-label/Data
                               
/dev/disk/by-partuuid/14b76e3c-62b1-4e16-9b3a-fd88e1dee8b4
                               
/dev/disk/by-path/pci-0000:00:14.0-usb-0:2:1.0-scsi-0:0:0:0-part/by-label/Data
                               
/dev/disk/by-path/pci-0000:00:14.0-usb-0:2:1.0-scsi-0:0:0:0-part/by-partnum/1
                               
/dev/disk/by-path/pci-0000:00:14.0-usb-0:2:1.0-scsi-0:0:0:0-part/by-partuuid/14b76e3c-62b1-4e16-9b3a-fd88e1dee8b4
                               
/dev/disk/by-path/pci-0000:00:14.0-usb-0:2:1.0-scsi-0:0:0:0-part/by-uuid/8f7eec48-4e3b-4257-b898-dac4c66f4d83
                               
/dev/disk/by-path/pci-0000:00:14.0-usb-0:2:1.0-scsi-0:0:0:0-part1
                               
/dev/disk/by-path/pci-0000:00:14.0-usbv3-0:2:1.0-scsi-0:0:0:0-part1
                               
/dev/disk/by-uuid/8f7eec48-4e3b-4257-b898-dac4c66f4d83
    UserspaceMountOptions:      
  org.freedesktop.UDisks2.Filesystem:
    MountPoints:        /mnt/ext_disk1
    Size:               1800321105920
  org.freedesktop.UDisks2.Partition:
    Flags:              0
    IsContained:        false
    IsContainer:        false
    Name:               
    Number:             1
    Offset:             1048576
    Size:               1800321105920
    Table:              '/org/freedesktop/UDisks2/block_devices/sda'
    Type:               0fc63daf-8483-4772-8e79-3d69d8477de4
    UUID:               14b76e3c-62b1-4e16-9b3a-fd88e1dee8b4

$ solid-hardware6 list details

udi = '/org/freedesktop/UDisks2/block_devices/sda1'
  parent =
'/org/freedesktop/UDisks2/drives/SanDisk_Extreme_55AE_32353031314B343031333435'
(string)
  vendor = 'SanDisk' (string)
  product = 'Extreme 55AE' (string)
  description = 'Data' (string)
  icon = 'drive-removable-media-usb' (string)
  Block.major = 8  (0x8)  (int)
  Block.minor = 1  (0x1)  (int)
  Block.device = '/dev/sda1' (string)
  StorageAccess.accessible = true (bool)
  StorageAccess.filePath = '/mnt/ext_disk1' (string)
  StorageAccess.ignored = true (bool)
  StorageAccess.encrypted = false (bool)
  StorageVolume.ignored = false (bool)
  StorageVolume.usage = 'FileSystem'  (0x2)  (enum)
  StorageVolume.fsType = 'xfs' (string)
  StorageVolume.label = 'Data' (string)
  StorageVolume.uuid = '8f7eec48-4e3b-4257-b898-dac4c66f4d83' (string)
  StorageVolume.size = 1800321105920  (0x1a32b800000)  (qulonglong)

udi = '/org/freedesktop/UDisks2/block_devices/sda'
  parent =
'/org/freedesktop/UDisks2/drives/SanDisk_Extreme_55AE_32353031314B343031333435'
(string)
  vendor = 'SanDisk' (string)
  product = 'Extreme 55AE' (string)
  description = '1.8 TiB Removable Media' (string)
  icon = 'drive-removable-media-usb' (string)
  Block.major = 8  (0x8)  (int)
  Block.minor = 0  (0x0)  (int)
  Block.device = '/dev/sda' (string)
  StorageVolume.ignored = true (bool)
  StorageVolume.usage = 'PartitionTable'  (0x3)  (enum)
  StorageVolume.fsType = '' (string)
  StorageVolume.label = '' (string)
  StorageVolume.uuid = '' (string)
  StorageVolume.size = 2000365371904  (0x1d1bf114200)  (qulonglong)

udi =
'/org/freedesktop/UDisks2/drives/SanDisk_Extreme_55AE_32353031314B343031333435'
  parent = '/org/freedesktop/UDisks2' (string)
  vendor = 'SanDisk' (string)
  product = 'Extreme 55AE' (string)
  description = 'SanDisk Extreme 55AE' (string)
  icon = 'drive-removable-media-usb' (string)
  Block.major = 8  (0x8)  (int)
  Block.minor = 1  (0x1)  (int)
  Block.device = '/dev/sda1' (string)
  StorageDrive.bus = 'Usb'  (0x1)  (enum)
  StorageDrive.driveType = 'HardDisk'  (0x0)  (enum)
  StorageDrive.removable = true (bool)
  StorageDrive.hotpluggable = true (bool)
  StorageDrive.inUse = true (bool)
  StorageDrive.size = 2000365371904  (0x1d1bf114200)  (qulonglong)
  StorageDrive.timeDetected = '2025-03-22T12:27:34.204' (QDateTime)
  StorageDrive.timeMediaDetected = '2025-03-22T12:27:34.204' (QDateTime)

(there were no fstab lines for this disk in the output)

$ ls /usr/share/thumbnailers/
avif.thumbnailer  gdk-pixbuf-thumbnailer.thumbnailer  gsf-office.thumbnailer 
jxl.thumbnailer  librsvg.thumbnailer  webp-pixbuf.thumbnailer

This is a new installation (the machine was promoted to a desktop from a
"server" with no GUI), the preview settings were default (untouched).

dolphin outputs these when run from the terminal:

qt.core.qobject.connect: QObject::connect: No such signal
Solid::Backends::Fstab::FstabStorageAccess::checkDone(Solid::ErrorType,
QVariant, QString)
...
qt.gui.imageio: libpng warning: known incorrect sRGB profile
qt.gui.imageio: libpng warning: profile matches sRGB but writing iCCP instead
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: known incorrect sRGB profile
qt.gui.imageio: libpng warning: profile matches sRGB but writing iCCP instead
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
...
kf.kio.core.connection: Socket not connected QLocalSocket::PeerClosedError
kf.kio.core: An error occurred during write. The worker terminates now.
QThreadStorage: Thread 0x55ae2e02f010 exited after QThreadStorage 8 destroyed
QThreadStorage: Thread 0x55ae2e02f010 exited after QThreadStorage 2 destroyed
QThreadStorage: Thread 0x55ae2e02f010 exited after QThreadStorage 1 destroyed
QLayout::removeWidget: Cannot remove a null widget.
kf.kio.core.connection: Socket not connected QLocalSocket::PeerClosedError
kf.kio.core: An error occurred during write. The worker terminates now.
QThreadStorage: Thread 0x5589768c1010 exited after QThreadStorage 8 destroyed
QThreadStorage: Thread 0x5589768c1010 exited after QThreadStorage 2 destroyed
QThreadStorage: Thread 0x5589768c1010 exited after QThreadStorage 1 destroyed
qt.qpa.wayland: Creating a popup with a parent, QWidgetWindow(0x55e71eb6b180,
name="Dolphin#1Window") which does not match the current topmost grabbing
popup, QWidgetWindow(0x55e71f42c710, name="QMenuClassWindow") With some shell
surface protocols, this is not allowed. The wayland QPA plugin is currently
handling it by setting the parent to the topmost grabbing popup. Note, however,
that this may cause positioning errors and popups closing unxpectedly. Please
fix the transient parent of the popup.
qt.qpa.wayland: Creating a popup with a parent, QWidgetWindow(0x55e71eb6b180,
name="Dolphin#1Window") which does not match the current topmost grabbing
popup, QWidgetWindow(0x55e71f42c710, name="QMenuClassWindow") With some shell
surface protocols, this is not allowed. The wayland QPA plugin is currently
handling it by setting the parent to the topmost grabbing popup. Note, however,
that this may cause positioning errors and popups closing unxpectedly. Please
fix the transient parent of the popup.
kf.kio.core.connection: Socket not connected QLocalSocket::PeerClosedError
kf.kio.core: An error occurred during write. The worker terminates now.
QThreadStorage: Thread 0x561283a26010 exited after QThreadStorage 8 destroyed
QThreadStorage: Thread 0x561283a26010 exited after QThreadStorage 2 destroyed
QThreadStorage: Thread 0x561283a26010 exited after QThreadStorage 1 destroyed

I think "known incorrect sRGB profile" comes from some old photos I have, I
doubt it's connected to the issue.

I'm not sure what you mean by the "dolphin's information panel" - I suppose the
sidebar with Places / Remote / Recent / Devices? In which case yes, I have the
icons there and in general no issues with icons, only thumbnails. I also added
"Show Previews" button to the main bar to make sure they were enabled.

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