Red Hat Bugzilla – Bug 452665
Live USB doesn't resume from suspend properly
Last modified: 2013-01-09 23:43:42 EST
Description of problem:
When resuming from suspend-to-ram mode, the USB stick which holds the live OS
does not receive the same kernel name, e.g. it was /dev/sdb before suspend and
/dev/sdc after resume. The running system is then mostly broken.
Version-Release number of selected component (if applicable):
Official Fedora 9 x86 LiveCD dumped to USB from Windows with
liveusb-creator-2.5, with persistent overlay.
Seemingly every time
Steps to Reproduce:
1. Boot Fedora 9 from LiveUSB.
2. Choose System -> Shutdown -> Suspend from the GNOME menu.
3. Resume from suspend.
4. Try to launch an application that has not been already loaded into memory,
such as Applications -> System Tools -> Terminal
5. Choose System -> Shutdown -> Shutdown from the GNOME menu.
The application will not launch and the system will not shut down properly.
The application would launch and the system would shut down properly.
There are LiveUSB distros that do not suffer from this, such as openSUSE
I did not remove the USB stick from the port, or make any other hardware
changes, while suspended. I believe with openSUSE and others, it is possible to
remove the stick while suspended and re-insert it into the same port before
resume, and it will still work.
I assume the redhat kernel maintainers are aware of this, but for others who may
be interested, see Documentation/usb/persist.txt in the kernel docs.
It appears this is a matter of setting CONFIG_USB_PERSIST and then enabling the
feature for the Live USB device with
echo 1 >/sys/bus/usb/devices/.../power/persist
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