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x79

Member

Registered: 2016-07-14

Posts: 14

External USB drive not detected on boot

I have a USB 3.0 drive that is detected and shown (usually) as /dev/sdg when I plug it in. The only 3.0 ports are located on an addon PCI-Express card. When I reboot, the device is missing until I unplug/insert the usb cable again.

I booted the machine with the drive connected and did dmesg, lspci, lsusb, and ls -l /dev/sd*. Then I unplugged/replugged the drive and did the same commands.

Before
dmesg
lspci
lsusb
ls -l /dev/sd*

After
dmesg
lspci
lsusb
ls -l /dev/sd*

Last edited by x79 (2016-08-24 03:01:32)

Starfish

Member

From: Germany

Registered: 2015-10-21

Posts: 134

Re: External USB drive not detected on boot

dmesg

in general. I this case I would try

dmesg | grep -i usb

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"Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the present." - Master Oogway

x79

Member

Registered: 2016-07-14

Posts: 14

Re: External USB drive not detected on boot

Updated with logs but I don't see anything that would help :-/

jasonwryan

Anarchist

From: .nz

Registered: 2009-05-09

Posts: 30,424

Website

Re: External USB drive not detected on boot

I would compare the modules that are loaded before and after a plug/unplug cycle.

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Registered Linux User #482438

x79

Member

Registered: 2016-07-14

Posts: 14

Re: External USB drive not detected on boot

I would compare the modules that are loaded before and after a plug/unplug cycle.

loaded modules are identical :-/
lsmod

Only changes are some numbers in the 'Used by' column for 3 sound modules.

Starfish

Member

From: Germany

Registered: 2015-10-21

Posts: 134

Re: External USB drive not detected on boot

Only changes are some numbers in the 'Used by' column for 3 sound modules.

That does make a difference.

Let's do Jason's approach more systematically:
Before the plugin, type

lsmod > before.asc

after the plugin, type

lsmod > after.asc

and finally

diff before.asc after.asc

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"Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the present." - Master Oogway

x79

Member

Registered: 2016-07-14

Posts: 14

Re: External USB drive not detected on boot

Only changes are some numbers in the 'Used by' column for 3 sound modules.

That does make a difference.

Let's do Jason's approach more systematically:
Before the plugin, type

lsmod > before.asc

after the plugin, type

lsmod > after.asc

and finally

diff before.asc after.asc

diff lsmod.txt lsmod2.txt
I had compared them using Winmerge. I only dismissed it because I didn't think the sound modules were relevant to this issue.

Last edited by x79 (2016-08-24 11:40:49)