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Ticket Resolution Summary Owner Reporter
#18972 fixed Application windows disappear when switching to Seamless Mode 4til7
Description

When I switch to seamless mode, all application windows disappear. Problem experienced under 6.02. Upgraded to 6.12. The problem still exists.

This may be an ongoing issue. A search of bug track found reports of seamless mode not working (or not working well, e.g. https://www.virtualbox.org/ticket/15318). The ones reviewed were not specific about the issues experienced.

Ubuntu 18.04

#6586 obsolete linux loopback mounted disk image != actual hard disk image (linux loop devices) 6502cpu
Description

I use loopback devices to create disk image files for development (/dev/loop0 for example). If I create a _filesystem_ only on my loop device, virtualbox can boot from it. For example:

dd if=/dev/zero of=diskimage bs=1M count=128 losetup /dev/loop0 mkfs.msdos /dev/loop0 syslinux -s /dev/loop0

(assuming you have a virtualbox disk image file describing loop0).

If I instead however, create a _partiton_, with a filesystem on the partition, I cannot boot for some reason. For example, I would use this process to create a compact flash which I could then boot from either in a real device or with QEMU:

dd if=/dev/zero of=/dev/sdc bs=1M count=128 fdisk /dev/sdc (create a single partition, sdc1, msdos fat16) mkfs.msdos /dev/sdc1 syslinux -s /dev/sdc1

if I use: dd if=/dev/sdc bs=1M of=myimage and then losetup /dev/loop0 myimage

and boot virtualbox with that loopdevice .vdi, it doesn't boot. BUT, qemu has no trouble:

qemu -hda myimage /dev/zero

This small size disk does have 32/sectors per track and not 63 that most others have. Otherwise I can't see how it would be choking since virtualbox otherwise should be insensitive to the 'type' of device (/dev/sd instead of /dev/loop).

#5426 fixed USB filter IsActive flag is not editable => Fixed in SVN 666f6f
Description
  1. Create a Virtual Machine
  2. Open the USB settings for that machine
  3. Add a (dummy) USB filter and click OK. The filter should be Active, which is the default value.
  4. Again, open the USB settings for that machine
  5. Uncheck the checkbox to the left of the dummy USB filter and click OK. The filter should be Inactive now.
  6. Again, open the the USB settings for that machine. Pay attention that the filter is still Active.
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