Chris Murphy posted on Sun, 09 Apr 2017 15:25:18 -0600 as excerpted:
> On Sun, Apr 9, 2017 at 11:17 AM, Malte Eggers
> <m.egg...@campus.tu-berlin.de> wrote:
>> Hi,
>>
>> After suspending and waking up my laptop with the external hard drive
>> connected, I could no longer access the files on it. So I unmounted and
>> remounted it, only to discover that I could no longer mount it.
This is the only message from the thread I'm seeing ATM, so I'll reply
here. Agreed with C Murphy on the btrfs stuff, but my reply is on a
different tangent.
If your external hard drive is USB (not ESATA or other non-USB, couldn't
tell from the context CM quoted, which may or may not have been the
entire post), you are likely running into a known issue... with an
available solution. =:^)
FWIW I found out about this when I had a laptop with two USB-connected
CompactFlash slots, one of which was designed for effectively permanent
installation (the CF didn't stick out when inserted), the other for
temporary use (it stuck out and was thus easier to remove, but also easy
to damage either it or the slot if it was left inserted during
transport). But the permanent one wouldn't stay mounted over suspend...
until I found out about this and changed the kernel option. Looks like
you might be hitting the same issue.
The official Linux kernel documentation describing the problem and
optional solution is:
$KERNEL_DIR/Documentation/usb/persist.txt
Read that first. But that only explains the problem and gives you a way
to deal with it on a per-USB-device basis by writing to the appropriate
sysfs file. There's also a kernel option that lets you change the
default:
CONFIG_USB_DEFAULT_PERSIST
In the kernel config that's found under:
Device Drivers
USB support
Support for Host-side USB
Enable USB persist by default
If you use a distro-built kernel, you may want to at least check whether
they enabled that option or not.
If you build your own kernel, you may of course set that option as you
wish. =:^)
--
Duncan - List replies preferred. No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master." Richard Stallman
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