Re: [PLUG] Metal roofs and wireless?

[Bill Barry]

On Wed, May 18, 2016 at 4:39 PM, wes  wrote:

> On Wed, May 18, 2016 at 4:15 PM, Russell Senior  >
> wrote:
>
> > > "Michael" == Michael Rasmussen  writes:
> >
> > Michael> On Wed, May 18, 2016 at 01:38:11PM -0700, Michael Dexter wrote:
> > >> On 5/18/16 1:29 PM, wes wrote:
> > >> > I would also like to learn more about how to conduct a survey of
> > >> wireless > signaling. Perhaps this could be a subject for a talk?
> > >>
> > >> +2
> >
> > Michael> +3
> >
> > E.g. Wifi Analyzer app (on android), and walk around is the poor mans
> > solution, inside.
> >
> > Outside, you can use GPS to provide location data with signal strength,
> > e.g. with Kismet.  GPS doesn't work very well (or at all) inside.
> > Signal strength doesn't tell the whole story, of course.  Interference
> > from other transmitters is a factor as well.
> >
>
> who knows the whole story? where would we even begin to ask such questions?
>
> -wes
>

One place to begin asking this question is with antenna theory. The basic
question you are asking is what does the radiation pattern of a mobile
phone antenna or wifi router antenna look like if you put a huge plane of
metal above it.  There are debian packages like nec and xnecview  for
antenna modeling. Some of these only allow you to create wire elements, but
some allow  grid or planar elements. Getting an answer that you believe out
of these modelling programs is tricky.


Bill
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Re: [PLUG] Metal roofs and wireless?

[Chuck Hast]

The combination you mention here WiFi analyzer and Kismet are my two
favorite tools, I used to do RF surveys for utilities, so am somewhat fam-
iliar with it, There are much more expensive tools but those two will give
you plenty to work with.


On Wed, May 18, 2016 at 4:15 PM, Russell Senior 
wrote:

> > "Michael" == Michael Rasmussen  writes:
>
> Michael> On Wed, May 18, 2016 at 01:38:11PM -0700, Michael Dexter wrote:
> >> On 5/18/16 1:29 PM, wes wrote:
> >> > I would also like to learn more about how to conduct a survey of
> >> wireless > signaling. Perhaps this could be a subject for a talk?
> >>
> >> +2
>
> Michael> +3
>
> E.g. Wifi Analyzer app (on android), and walk around is the poor mans
> solution, inside.
>
> Outside, you can use GPS to provide location data with signal strength,
> e.g. with Kismet.  GPS doesn't work very well (or at all) inside.
> Signal strength doesn't tell the whole story, of course.  Interference
> from other transmitters is a factor as well.
>
>
> --
> Russell Senior, President
> russ...@personaltelco.net
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Glass, five thousand years of history and getting better.
The only container material that the USDA gives blanket approval on.
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Re: [PLUG] Metal roofs and wireless?

[Michael Dexter]

On 5/18/16 4:39 PM, wes wrote:
> who knows the whole story? where would we even begin to ask such questions?

I did a quick search for such "services" and saw some around the 
country. I also talked to my Verizon contact and their "RF surveys" are 
more about their safety from high-power signals rather than determine 
what might be obstructing or degrading a signal.

I wonder what the ham radio store in Tigard has to say...

Michael
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Re: [PLUG] Metal roofs and wireless?

[wes]

On Wed, May 18, 2016 at 4:15 PM, Russell Senior 
wrote:

> > "Michael" == Michael Rasmussen  writes:
>
> Michael> On Wed, May 18, 2016 at 01:38:11PM -0700, Michael Dexter wrote:
> >> On 5/18/16 1:29 PM, wes wrote:
> >> > I would also like to learn more about how to conduct a survey of
> >> wireless > signaling. Perhaps this could be a subject for a talk?
> >>
> >> +2
>
> Michael> +3
>
> E.g. Wifi Analyzer app (on android), and walk around is the poor mans
> solution, inside.
>
> Outside, you can use GPS to provide location data with signal strength,
> e.g. with Kismet.  GPS doesn't work very well (or at all) inside.
> Signal strength doesn't tell the whole story, of course.  Interference
> from other transmitters is a factor as well.
>

who knows the whole story? where would we even begin to ask such questions?

-wes
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Re: [PLUG] Metal roofs and wireless?

[Russell Senior]

> "Michael" == Michael Rasmussen  writes:

Michael> On Wed, May 18, 2016 at 01:38:11PM -0700, Michael Dexter wrote:
>> On 5/18/16 1:29 PM, wes wrote:
>> > I would also like to learn more about how to conduct a survey of
>> wireless > signaling. Perhaps this could be a subject for a talk?
>> 
>> +2

Michael> +3

E.g. Wifi Analyzer app (on android), and walk around is the poor mans solution, 
inside.

Outside, you can use GPS to provide location data with signal strength,
e.g. with Kismet.  GPS doesn't work very well (or at all) inside.
Signal strength doesn't tell the whole story, of course.  Interference
from other transmitters is a factor as well.


-- 
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russ...@personaltelco.net
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Re: [PLUG] Universality of USB Cables

[alan]

> On 2016-05-18 13:32, Rich Shepard wrote:
>> Am I correct in assuming that if I buy a USB cable with the
>> appropriately
>> sized plugs on each end it can be used with any device and a computer?
>
> Yep, that's the idear.  And you can get 'em from at the dollar store.

Actually not always...

Depends on the device and the cable.

There are "charge only" cables that will not transmit data.

If the device is made by Samsung, you need to make sure that it has the
correct cable. Some micro usb cables have a resistor in the end that the
Samsung device wants. (Part of the cable spec I believe.)

If it is a usb-c cable you need to verify if it is to spec. (There was a
Google engineer that reviewed all the cables on Amazon.) Not everything
was made correctly.

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Re: [PLUG] Universality of USB Cables

[Rich Shepard]

On Wed, 18 May 2016, chris (fool) mccraw wrote:

> Dunno what kind of camera you have, but the last camera I had, had images
> that were many megabytes in size and speed made a huge difference when
> transferring. If you transfer 1-2 pictures at a time no problem, but I
> transferred hundreds / huge movie files and it made a noticeable - 10x -
> difference when i upgraded to usb3.

Chris,

   A Canon EOS Rebel T3, the low-end of their line.

   As long as a USB3 cable supports USB2 (if that's what the camera and GPS
receiver use), I'll go for one of those.

   But, I normally have only a few images to transfer; I don't accumulate
them on the SD card. Based on your experiences, if I have a large volume to
transfer I'll remove the SD card and put it in a reader.

Thanks,

Rich
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Re: [PLUG] Universality of USB Cables

[chris (fool) mccraw]

On Wed, May 18, 2016 at 2:54 PM, Rich Shepard 
wrote:

> On Wed, 18 May 2016, chris (fool) mccraw wrote:
>
> > My understanding is that while they will all be usable to some extent,
> > there are differences in cabling that actually matter for transfer speed
> > or power transfer:
>
> Chris,
>
>Probably won't make any difference for me. Transferring images from the
> camera via cable rather than removing the SD card and mounting that in the
> desktop, or occasionally updating GPS maps are not speed dependent since
> the
> amount of data is comparatively small. Won't use them for charging
> batteries
> so power transfer is not an issue.


Dunno what kind of camera you have, but the last camera I had, had images
that were many megabytes in size and speed made a huge difference when
transferring.   If you transfer 1-2 pictures at a time no problem, but I
transferred hundreds / huge movie files and it made a noticeable - 10x -
difference when i upgraded to usb3.
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Re: [PLUG] Universality of USB Cables

[Rich Shepard]

On Wed, 18 May 2016, chris (fool) mccraw wrote:

> My understanding is that while they will all be usable to some extent,
> there are differences in cabling that actually matter for transfer speed
> or power transfer:

Chris,

   Probably won't make any difference for me. Transferring images from the
camera via cable rather than removing the SD card and mounting that in the
desktop, or occasionally updating GPS maps are not speed dependent since the
amount of data is comparatively small. Won't use them for charging batteries
so power transfer is not an issue.

Thanks,

Rich
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Re: [PLUG] Universality of USB Cables

[chris (fool) mccraw]

This was fascinating!

Highly recommended reading (though, also depressing, because all the usb C
accessories I just bought for my new nexus 6p phone are going to get binned
- I already threw out the packaging so can't return)

On Wed, May 18, 2016 at 2:30 PM, John Meissen  wrote:

> USB-C cables can be tricky. If you ever intend to get anything using one I
> recommend you read Benson Leung's reviews:
>
> https://plus.google.com/u/0/collection/s0Inv
>
> In fact, I would recommend reading them anyway. A bad cable can damage your
> equipment.
>
> john-
>
> gen...@gmail.com said:
> >
> > My understanding is that while they will all be usable to some extent,
> > there are differences in cabling that actually matter for transfer speed
> or
> > power transfer:
> >
> > USB3 cables are in some way physically different and enable much higher
> > transfer speed:
> >
> http://www.howtogeek.com/222400/do-usb-3.0-connections-require-usb-3.0-cables/
> >
> > Fast-charge-capable usb cables with Type C (there is no upside down to
> the
> > plugs - symmetrical) have some special sauce that allows for fast
> > charging.  I don't claim to understand how after a lot of reading, but it
> > seems like some are better than others (eg, charging is faster with one
> > cable than with another, measured in some way that struck me as
> > "sufficiently scientific for my belief-needs")
> >
> >
> >
> > On Wed, May 18, 2016 at 2:01 PM, Rich Shepard 
> > wrote:
> >
> > > On Wed, 18 May 2016, Aaron Burt wrote:
> > >
> > > > Yep, that's the idear.
> > >
> > >I thunk so, Aaron. Thanks.
> > >
> > > > And you can get 'em from at the dollar store.
> > >
> > >Really?? I'll have to check this out at the local one. Guess they're
> > > now a
> > > commodity and used for cell phones, too.
> > >
> > > Rich
>
>
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Re: [PLUG] Universality of USB Cables

[John Meissen]

USB-C cables can be tricky. If you ever intend to get anything using one I 
recommend you read Benson Leung's reviews:

https://plus.google.com/u/0/collection/s0Inv

In fact, I would recommend reading them anyway. A bad cable can damage your 
equipment.

john-

gen...@gmail.com said:
> 
> My understanding is that while they will all be usable to some extent,
> there are differences in cabling that actually matter for transfer speed or
> power transfer:
> 
> USB3 cables are in some way physically different and enable much higher
> transfer speed:
> http://www.howtogeek.com/222400/do-usb-3.0-connections-require-usb-3.0-cables/
> 
> Fast-charge-capable usb cables with Type C (there is no upside down to the
> plugs - symmetrical) have some special sauce that allows for fast
> charging.  I don't claim to understand how after a lot of reading, but it
> seems like some are better than others (eg, charging is faster with one
> cable than with another, measured in some way that struck me as
> "sufficiently scientific for my belief-needs")
> 
> 
> 
> On Wed, May 18, 2016 at 2:01 PM, Rich Shepard 
> wrote:
> 
> > On Wed, 18 May 2016, Aaron Burt wrote:
> >
> > > Yep, that's the idear.
> >
> >I thunk so, Aaron. Thanks.
> >
> > > And you can get 'em from at the dollar store.
> >
> >Really?? I'll have to check this out at the local one. Guess they're
> > now a
> > commodity and used for cell phones, too.
> >
> > Rich


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Re: [PLUG] Universality of USB Cables

[chris (fool) mccraw]

My understanding is that while they will all be usable to some extent,
there are differences in cabling that actually matter for transfer speed or
power transfer:

USB3 cables are in some way physically different and enable much higher
transfer speed:
http://www.howtogeek.com/222400/do-usb-3.0-connections-require-usb-3.0-cables/

Fast-charge-capable usb cables with Type C (there is no upside down to the
plugs - symmetrical) have some special sauce that allows for fast
charging.  I don't claim to understand how after a lot of reading, but it
seems like some are better than others (eg, charging is faster with one
cable than with another, measured in some way that struck me as
"sufficiently scientific for my belief-needs")



On Wed, May 18, 2016 at 2:01 PM, Rich Shepard 
wrote:

> On Wed, 18 May 2016, Aaron Burt wrote:
>
> > Yep, that's the idear.
>
>I thunk so, Aaron. Thanks.
>
> > And you can get 'em from at the dollar store.
>
>Really?? I'll have to check this out at the local one. Guess they're
> now a
> commodity and used for cell phones, too.
>
> Rich
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Re: [PLUG] Universality of USB Cables

[Rich Shepard]

On Wed, 18 May 2016, Aaron Burt wrote:

> Yep, that's the idear.

   I thunk so, Aaron. Thanks.

> And you can get 'em from at the dollar store.

   Really?? I'll have to check this out at the local one. Guess they're now a
commodity and used for cell phones, too.

Rich
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Re: [PLUG] Universality of USB Cables

[Aaron Burt]

On 2016-05-18 13:32, Rich Shepard wrote:
> Am I correct in assuming that if I buy a USB cable with the 
> appropriately
> sized plugs on each end it can be used with any device and a computer?

Yep, that's the idear.  And you can get 'em from at the dollar store.

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Re: [PLUG] Metal roofs and wireless?

[Michael Rasmussen]

On Wed, May 18, 2016 at 01:38:11PM -0700, Michael Dexter wrote:
> On 5/18/16 1:29 PM, wes wrote:
> > I would also like to learn more about how to conduct a survey of wireless
> > signaling. Perhaps this could be a subject for a talk?
> 
> +2

+3

-- 
  Michael Rasmussen, Portland Oregon  
Be Appropriate && Follow Your Curiosity
Taking a car is 10 times more hazardous than taking the bus, for adults
at least. But I don't see driving being made illegal anytime soon.
~ A pediatrician on bike safety laws
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Re: [PLUG] Metal roofs and wireless?

[Michael Dexter]

On 5/18/16 1:29 PM, wes wrote:
> I would also like to learn more about how to conduct a survey of wireless
> signaling. Perhaps this could be a subject for a talk?

+2

Michael
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Re: [PLUG] Metal roofs and wireless?

[John Jason Jordan]

On Wed, 18 May 2016 13:16:29 -0700
Michael Dexter  dijo:

>On 5/18/16 11:43 AM, Mike C. wrote:
>> Have you done a WiFi site survey with a heat map in the space where
>> WiFi is being provided? I ask because you'd be really surprised by
>> how different materials and obstacles affect the radio signal
>> propagation pattern.
>
>Suggestions on a survey?

If you are at a study carrel in the stacks at the PSU library, good
luck getting a decent wifi signal. The stacks are metal shelving.
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[PLUG] Universality of USB Cables

[Rich Shepard]

   Am I correct in assuming that if I buy a USB cable with the appropriately
sized plugs on each end it can be used with any device and a computer?

   If I buy a cable with a USB A-type male end for the computer and a
Micro-USB B female end, that terminal should fit both the Canon Rebel T3
camera and the Garmin Oregon 450 GPS receiver. Yes?

   Local sources? Amazon has a vendor selling them for $0.99 + $2.99 postage.

Rich
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Re: [PLUG] Metal roofs and wireless?

[wes]

On Wed, May 18, 2016 at 1:16 PM, Michael Dexter 
wrote:

> On 5/18/16 11:43 AM, Mike C. wrote:
> > Have you done a WiFi site survey with a heat map in the space where WiFi
> is
> > being provided? I ask because you'd be really surprised by how different
> > materials and obstacles affect the radio signal propagation pattern.
>
> Suggestions on a survey?
>
> Michael
>
>
I would also like to learn more about how to conduct a survey of wireless
signaling. Perhaps this could be a subject for a talk?

-wes
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Re: [PLUG] Metal roof and wireless

[Michael Dexter]

On 5/18/16 12:19 PM, Tomas Kuchta wrote:
> It seems to me that quite few people here do not appreciate privacy and EM
> quietness of metal shielding or reflectivity!

Not to mention tinfoil hats!

Michael
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Re: [PLUG] Metal roofs and wireless?

[Michael Dexter]

On 5/18/16 11:43 AM, Mike C. wrote:
> Have you done a WiFi site survey with a heat map in the space where WiFi is
> being provided? I ask because you'd be really surprised by how different
> materials and obstacles affect the radio signal propagation pattern.

Suggestions on a survey?

Michael
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Re: [PLUG] Metal roof and wireless

[Tomas Kuchta]

It seems to me that quite few people here do not appreciate privacy and EM 
quietness of metal shielding or reflectivity!

What's not to like - if the roof has the right shape and one could place WiFi 
in its focal point!

People living in apartment buildings, condos or neighborhoods with too many LR 
APs would love shielding.
For 3G and LTE you could get pico/femto-cell and connect it to your internet. 
All major operators seems to offer them even around here.

I hope that you like my opening fun.

Tomas

On Wednesday, May 18, 2016 11:06:06 AM Ishak Micheil wrote:
> You've got to be kidding me. We're just about to move into  mid 50s home
> with Metal roofouch!
> On May 18, 2016 09:59, "John Bartley K7AAY j...@503bartley.com" <
> john.bart...@gmail.com> wrote:
> 
> Chicken wire (2" and smaller grids)  were used in the drywall of my former
> house,  a 60's ranch split-level.  Have been told it was common for a
> couple of decades around here for fire prevention. Sure does an excellent
> job of blocking signal even though the roof was NOT metal.
> 
> 73s and best regards de K7AAY
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Re: [PLUG] Kernel panic?

[Tim Wescott]

This has been happening to me off and on since the upgrade to
3.16.0-71-generic (64-bit).  70-generic would just randomly panic, so
until 71 came out I was running 69-generic.  71-generic seems to panic
sometimes when I plug in my Android phone, or when I dismount it -- but
it hasn't shown problems with my Cannon PowerShot S3IS (cameras are the
only "removable media" I've been using lately).

You may just want to run 69-generic.

Have you sent in a bug report?  (Have I sent in a bug report?  No, but
I think I should!)

On Sun, 2016-05-15 at 21:17 -0700, John Jason Jordan wrote:
> About a week ago I added a USB 3.0 external DVD drive to my laptop. It
> has been working fine. Today I disconnected it when I took the computer
> to the Clinic. Also, before going to the Clinic I installed all the
> recent updates for the OS (Xubuntu 14.04). There were a lot of updates,
> including a new kernel. The laptop functioned fine at the Clinic.
> 
> Back home I reconnected the new DVD drive, and used it to rip and encode
> a DVD from my collection. This went perfectly. Then I started to rip
> and encode a second DVD, but this one hung at 85%, probably due to the
> media being scratched. I was encoding with Handbrake, so I stopped the
> encoding, but Handbrake would not stop. This has been a bug in
> Handbrake for a long time, although the upgrades I did this morning
> included a new version. In the past I could simply kill Handbrake, then
> manually eject the DVD. When I did so this time the computer hung - no
> keyboard, no mouse. (No I don't have a way to SSH into it.) 
> 
> I powered down and restarted it, then I cleaned the DVD media and tried
> again. And once again, Handbrake hung on about 85%. I killed Handbrake
> again, but this time the DVD light was still flickering. So I pressed
> the eject button several times, and was suddenly greeted with a black
> screen full of unintelligible command-line type text, and two lights
> were flashing (hard drive and numlock? - can't remember which is
> which). 
> 
> Again, I rebooted and everything is fine. 
> 
> This happened to me once a number of years ago and I was told that
> flashing lights mean a kernel panic. Beyond that I know nothing. 
> 
> I need suggestions.
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> 

-- 

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Control & Communications systems, circuit & software design.
Phone: 503.631.7815
Cell:  503.349.8432


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Re: [PLUG] Metal roof and wireless

[Ishak Micheil]

You've got to be kidding me. We're just about to move into  mid 50s home
with Metal roofouch!
On May 18, 2016 09:59, "John Bartley K7AAY j...@503bartley.com" <
john.bart...@gmail.com> wrote:

Chicken wire (2" and smaller grids)  were used in the drywall of my former
house,  a 60's ranch split-level.  Have been told it was common for a
couple of decades around here for fire prevention. Sure does an excellent
job of blocking signal even though the roof was NOT metal.

73s and best regards de K7AAY
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Re: [PLUG] Metal roof and wireless

[John Bartley K7AAY j...@503bartley.com]

Chicken wire (2" and smaller grids)  were used in the drywall of my former
house,  a 60's ranch split-level.  Have been told it was common for a
couple of decades around here for fire prevention. Sure does an excellent
job of blocking signal even though the roof was NOT metal.

73s and best regards de K7AAY
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Re: [PLUG] Recommended Card Reader for Ubuntu 14

[David]

On 05/18/2016 07:46 AM, Dick Steffens wrote:
> On 05/17/2016 10:06 PM, Dick Steffens wrote:
>> On 05/17/2016 06:56 PM, David wrote:
>> While an obnoxious step most of the time, this is hook related and the
>> kernel may not respond well (in rare instances) when packages are added.
>>
>> You'll probably have to reboot to clear the lsusb issue if you can't
>> find which process is keeping it bound up.
>> I'll give that a try in the morning.
>
> I powered down and restarted. Then I installed usbmount. Then I
> restarted. Then I plugged in my card reader and got this message:
>
> 
> Unable to mount EOS_DIGITAL
>
> Device /dev/sdd1 is already mounted at `/media/usb0'.
> 
>
> lsusb works now and shows this:
>
> 
> rsteff@Enu-1:~$ lsusb
> Bus 002 Device 002: ID 8087:8000 Intel Corp.
> Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 001 Device 002: ID 8087:8008 Intel Corp.
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Bus 003 Device 006: ID 058f:6362 Alcor Micro Corp. Flash Card Reader/Writer
> Bus 003 Device 003: ID 04b3:3025 IBM Corp. NetVista Full Width Keyboard
> Bus 003 Device 002: ID 046d:c016 Logitech, Inc. Optical Wheel Mouse
> Bus 003 Device 004: ID 05f3:00ff PI Engineering, Inc. VEC Footpedal
> Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> 
>
> Sure enough, the card reader is mounted at /media/usb0. So some
> progress, but why that error message?
>
> In Nautilus there's a little triangle to the right of the device name
> that one clicks on to umount a device. When I click on it I'm required
> to provide a password. The password box has this wording:
>
> 
> Authenticate
>
> Authentication is required to unmount Generic USB CF Reader(/dev/sdd1)
> mounted by another user

This indicates that something else has mounted your device. The below is 
just asking for an administrator password.

> A application is attempting to perform an action that requires privileges.
> Authentication is required to perform this action.
>
> Password: []
>
> Details
> Action: org.freedesktop.udisks2.filesystem-unmount-others
> Vendor: The udisks Project
> 
>
> Upon entering the password I get this message:
>
> 
> Volume is busy.
>
> One of more applications are keeping the volume busy.
> rsteff@Enu-1: /media/usb0/DCIM
> [Cancel] [Eject Anyway]
> 

You can try to find out what is holding the device open with lsof, and 
that might hint at what was used to mount it, and then troubleshoot 
things from there. Eject Anyway could lead to a dirty umount or a broken 
shell / utility when it can't see the device any longer.

> I hit [Cancel], switched to a different directory in Nautilus and tried
> again. Same error message as before. This time I hit [Eject Anyway].
> EOS_DIGITAL disappeared from the left hand pane of the Nautilus window.
> I jostled the USB plug when reaching to unplug it. Very briefly,
> EOS_DIGITAL appeared in the left hand pane of the Nautilus window, went
> away, and the "Unable to mount EOS_DIGITAL error message appeared:
>
> 
> Unable to mount EOS_DIGITAL
>
> Device /dev/sdd1 is already mounted at `/media/usb0'.
> 
>
> So this is a work-around, but it seems screwy.
>

Yeah, screwy sums it up nicely. Keep plugging at it. You may also want 
to continue to do web searches on resolution with other means, and 
possibly confirm which group associations your user needs to be a member 
of for this to all work properly.

dafr

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Re: [PLUG] Recommended Card Reader for Ubuntu 14

[Dick Steffens]

On 05/17/2016 10:06 PM, Dick Steffens wrote:
> On 05/17/2016 06:56 PM, David wrote:
> While an obnoxious step most of the time, this is hook related and the
> kernel may not respond well (in rare instances) when packages are added.
>
> You'll probably have to reboot to clear the lsusb issue if you can't
> find which process is keeping it bound up.
> I'll give that a try in the morning.

I powered down and restarted. Then I installed usbmount. Then I 
restarted. Then I plugged in my card reader and got this message:


Unable to mount EOS_DIGITAL

Device /dev/sdd1 is already mounted at `/media/usb0'.


lsusb works now and shows this:


rsteff@Enu-1:~$ lsusb
Bus 002 Device 002: ID 8087:8000 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 006: ID 058f:6362 Alcor Micro Corp. Flash Card Reader/Writer
Bus 003 Device 003: ID 04b3:3025 IBM Corp. NetVista Full Width Keyboard
Bus 003 Device 002: ID 046d:c016 Logitech, Inc. Optical Wheel Mouse
Bus 003 Device 004: ID 05f3:00ff PI Engineering, Inc. VEC Footpedal
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub


Sure enough, the card reader is mounted at /media/usb0. So some 
progress, but why that error message?

In Nautilus there's a little triangle to the right of the device name 
that one clicks on to umount a device. When I click on it I'm required 
to provide a password. The password box has this wording:


Authenticate

Authentication is required to unmount Generic USB CF Reader(/dev/sdd1) 
mounted by another user

A application is attempting to perform an action that requires privileges.
Authentication is required to perform this action.

Password: []

Details
Action: org.freedesktop.udisks2.filesystem-unmount-others
Vendor: The udisks Project


Upon entering the password I get this message:


Volume is busy.

One of more applications are keeping the volume busy.
rsteff@Enu-1: /media/usb0/DCIM
[Cancel] [Eject Anyway]


I hit [Cancel], switched to a different directory in Nautilus and tried 
again. Same error message as before. This time I hit [Eject Anyway]. 
EOS_DIGITAL disappeared from the left hand pane of the Nautilus window. 
I jostled the USB plug when reaching to unplug it. Very briefly, 
EOS_DIGITAL appeared in the left hand pane of the Nautilus window, went 
away, and the "Unable to mount EOS_DIGITAL error message appeared:


Unable to mount EOS_DIGITAL

Device /dev/sdd1 is already mounted at `/media/usb0'.


So this is a work-around, but it seems screwy.

-- 
Regards,

Dick Steffens

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[PLUG] Ubuntu folks?

[Michael Dexter]

Hello all,

It seems all of my Ubuntu peeps have left Canonical. Might any of you be 
in a position to discuss their official hardware compatibility guide and 
compliance?

Thanks!

Michael
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