[Bug 264905] New: KDE touches unmounted filesystems, applications block for several seconds

[Juliano F. Ravasi]

https://bugs.kde.org/show_bug.cgi?id=264905

           Summary: KDE touches unmounted filesystems, applications block
                    for several seconds
           Product: kde
           Version: 4.6
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: unassigned-bugs at kde.org
        ReportedBy: bugs+kde at juliano.info


Version:           4.6 (using KDE 4.6.0) 
OS:                Linux

I'm not sure what component this bug should be filed, it manifests itself most
visibly in Dolphin and the Device Notifier widget, but also in Open/Save File
dialogs across KDE applications.

Starting with KDE 4.6, unmounted filesystems are touched (probed?) when the
user interacts with devices in the Places lists available in Dolphin, Device
Notifier, Open/Save file dialogs, etc.

In many cases, external hard disks enter in low power mode when not in use for
several minutes (very likely if there are no mounted filesystems from that hard
disk), sometimes even powering off almost completely. When doing simple
interaction on the "Places" list, even simply hovering the partition name with
the mouse pointer, KDE somehow tries some interaction with the unmounted
partition.

The result is, since the device was powered off, it has to restart. This may
take as much as 12 seconds or more for the disk to spin up and reinitialize,
from what I'm experiencing. During this time, the application is completely
unresponsive, frozen.

This must not happen unless I actually click the partition to be mounted. This
was not an issue up to KDE 4.5.5.

Reproducible: Always

Steps to Reproduce:
1. Connect an external USB hard disk with energy saving mode.
2. Do not mount it, wait it to power off.
3. Open Dolphin, move the mouse pointer over the partition in Places (without
clicking anything or mounting the partition).

Actual Results:  
Dolphin freezes, the hard disk is powered on (may take several seconds), and
then it unfreezes.

Expected Results:  
The unmounted partition is simply listed, and otherwise ignored by the system
until the user clicks to mount it.

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