Re: Digital noise from USB DAC device

[o . fairhall]

Could be noise coupled in over ground/power lines of the USB
connection. This is very common, and depends a lot on the particulars
of the hardware set up.

See if you can isolate any other ground connections from the USB
device. Isolate other peripherals from the PC. Test with headphones
for any improvement. Can the USB device be powered independantly from
the USB port?

There are USB galvanic isolators, but they're not all good.

Of course, look at the software mixer as well.

Cheap way to track disk usage?

[Richard Hector]

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Hi all,

I have an issue with a (client's) large (13T) filesystem, that fills
up every now and then and nobody's quite sure what's doing it.

I can run du, but that takes ages, and has a performance impact. df
only gives the total for the filesystem, of course.

Currently I'm running find occasionally, with fprintf to record
filename, mtime and size, then analysing it (by importing it into
postgres, fwiw) for new large files - but ideally I'd like to zero in
by frequently checking sizes of whole directories. Is there any way to
do that, perhaps by triggering off write calls, cheaply?

I know that inotify/incron have their limitations when working with
deep directory structures; I'd be interested to know of anything that
can trigger on any writes to a particular filesystem.

If I could start again, I'd put LVM on the array and use multiple LVs
to allow du to work at lower levels, but that's not really practical
at this stage.

Any tips?

Richard
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Re: Digital noise from USB DAC device

[Teemu Likonen]

August Karlstrom [2015-03-02 22:57:15+01] wrote:

> On 2015-03-02 21:00, Teemu Likonen wrote:
>> I got a new USB DAC device (digital to analog converter, a "sound
>> card") and I'm having problems with digital noise.
>
> What is the name of the DAC?

Henry Audio USB DAC 128 mkII
http://www.henryaudio.com/

> Does alsamixer show only one PCM slider? Is PulseAudio running?

Not even that because the device has no volume settings. See the post I
sent a couple of minutes ago on this same discussion thread. Pulseaudio
is not installed.

>> mplayer -af-clr -ao alsa:device=hw=1.0 -format s32le [...]
>
> Do you get distortion with a basic aplay command as well?
>
> aplay --device=hw:1,0 SomeFile.wav

Yes. It's the same.

Could this be some internal USB driver issue?


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Re: Digital noise from USB DAC device

[Teemu Likonen]

Dan Ritter [2015-03-02 16:26:12-05] wrote:

> If you have an alsa output, there is a software mixer. Control it with
> alsamixer, and turn off all the inputs that aren't being used.

ALSA can use to sound devices' hardware mixer but ALSA has its own
software mixer too.

I'm bypassing ALSA's software mixer (dmix module). Here's another way to
explain my ALSA connection:

# ~/.asoundrc
pcm.!dac {
type hw
card 1
}

And music goes to that device:

mplayer -af-clr -ao alsa:device=dac -format s32le music.flac

And there is not much hardware mixer either. Command "amixer -c1" says
this:

Simple mixer control 'Clock 2',0
  Capabilities: pswitch penum
  Playback channels: Front Left - Front Right
  Mono:
  Front Left: Playback [on]
  Front Right: Playback [on]
Simple mixer control 'Clock 2',1
  Capabilities: pswitch pswitch-joined penum
  Playback channels: Mono
  Mono: Playback [on]

Those clocks can be turned "on" or "off". The "off" position makes the
sound silent.

I believe this is either a hardware issue or some internal USB driver
issue.


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Re: Purging depends in cinnamon

[Frank]

On 02/03/15 11:03 PM, Chris Bannister wrote:

On Mon, Mar 02, 2015 at 12:59:28PM -0500, Frank wrote:

I recently installed the cinnamon desktop in my Sid installation
which of course brought in Icedove and Ice Weasel as well as a number
of other programs.

Is there any way to eliminate them, as I have been running Thunderbird
and firefox. Trying to purge them results in aptitude wanting to
purge a lot of other stuff, including the cinnamon-desktop-environment.


One of could be a virtual package depending on Iceweasel etc. I'd check
with e.g. a combination of 'apt-cache rdepends iceweasel' and 'apt-cache
show '

I don't use cinnammon so don't know the exact packagename.




   Yes it's a virtual package with a long list of depends. I ended up 
purging it which also took out 25 or 30 other packages...none of which I 
need anyway.  So, all's well that ends well.


Thanks


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Re: Purging depends in cinnamon

[Chris Bannister]

On Mon, Mar 02, 2015 at 12:59:28PM -0500, Frank wrote:
> I recently installed the cinnamon desktop in my Sid installation
> which of course brought in Icedove and Ice Weasel as well as a number
> of other programs.
> 
> Is there any way to eliminate them, as I have been running Thunderbird
> and firefox. Trying to purge them results in aptitude wanting to
> purge a lot of other stuff, including the cinnamon-desktop-environment.

One of could be a virtual package depending on Iceweasel etc. I'd check
with e.g. a combination of 'apt-cache rdepends iceweasel' and 'apt-cache
show '

I don't use cinnammon so don't know the exact packagename.

-- 
"If you're not careful, the newspapers will have you hating the people
who are being oppressed, and loving the people who are doing the 
oppressing." --- Malcolm X


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Re: USB keyboard required replugging--how to avoid?

[Richard Hector]

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On 03/03/15 02:22, Dr. Jennifer Nussbaum wrote:
> The problem is that the new box has hard-to-access USB ports, so in
> order to replug the keyboard, I have to remove a panel, so its not
> just a quick step.

In the event you can't fix it properly (faulty keyboard perhaps?), you
could use an extension cable, or a hub?

Richard
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Environment variables affecting postscript files?

[Rodolfo Medina]

Hi all.

I'm having troubles with ps files generated by Emacs ps-print package - footers
are partially cut off.  Is it possibile that some environment variable causes
the weird?  And how can I know (and work it out)?

Thanks for any help,

Rodolfo


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Re: Digital noise from USB DAC device

[August Karlstrom]

On 2015-03-02 21:00, Teemu Likonen wrote:

I got a new USB DAC device (digital to analog converter, a "sound card")
and I'm having problems with digital noise.


What is the name of the DAC?


Music goes directly to the device without any mixers,


Does alsamixer show only one PCM slider? Is PulseAudio running?

> mplayer -af-clr -ao alsa:device=hw=1.0 -format s32le [...]

Do you get distortion with a basic aplay command as well?

aplay --device=hw:1,0 SomeFile.wav


-- August


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Re: Digital noise from USB DAC device

[Dan Ritter]

On Mon, Mar 02, 2015 at 10:23:40PM +0200, Teemu Likonen wrote:
> Dan Ritter [2015-03-02 15:11:00-05] wrote:
> 
> > The static part could easily be introduced in mixing; check alsamixer
> > that everything non-essential is turned down to zero.
> 
> But there is no mixer, neither software nor hardware. I think the
> connection to the DAC is as bit-perfect as it can be.

If you have an alsa output, there is a software mixer. Control
it with alsamixer, and turn off all the inputs that aren't being
used.

-dsr-


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Re: dhcp and foreign ip

[Bob Proulx]

Joe wrote:
> Pol Hallen wrote:
> > Sometimes I see inside the arp table (from wlan0) a strange IP like:
> > 
> > 10.168.245.246 or similar
> > 
> > what does it mean?
> > Could be a PC with static IP goes inside my lan (via wireless) or
> > what?
> 
> Yes. A WAP may relay packets before it knows that the sender is
> authenticated, as many authentication mechanisms involve TCP exchanges
> and therefore need a valid local IP address. Your DHCP logs may well
> show addresses being handed out to these outsiders, but presumably your
> other logs do not show anyone actually being authenticated at the time
> you see these addresses.

Not quite.

> I don't believe that wireless encryption methods are relevant at the
> DHCP level,

Exactly!  That is what usually happens in this case.

> so even though your WAP uses WPA2 and a long password, which will
> stop anyone being authenticated, this doesn't affect DHCP
> negotiations.

Eactly correct.  The WiFi encryption is a separate layer.  This does
not affect anything IP (as in TCP/IP but also applies to TCP/UDP and
TCP/ICMP and so forth) related.

The first layer is the WPA/WPA2.  That controls access to the WiFi.
If the client device connects then they are on the network.  And that
includes any configuration of IP addresses they may or may not have at
that moment.  If they are configured for a static IP then they will
use that static IP configuration.  More often it is a device with DHCP
but just woke up and is still using a previously assigned IP address
from a different network.

> Let's put it this way: in a network belonging to one of my clients,
> I often see DHCP addresses being handed out to machines that do not
> belong in the network, but there is never a sign of any further use
> of those addresses. There is certainly a strong WPA2 passphrase set
> there.

In a busy small company environment with a lot of people coming and
going I also often see foreign IP addresses immediately after a device
connects to the network.  I think this is a bug in the client device
configuration.  It shouldn't be emitting packets before it has
negotiated a valid LAN address by DHCP.  But many devices do.  At
least it appears that way.

You can track down the device by crosschecking the ethernet address
with the address assigned by dhcp and logged to /var/log/syslog.  But
tracking down random people's hardware just isn't productive.  You
wouldn't be able to fix them anyway.

> I believe that during DHCP negotiations, the addresses 0.0.0.0 and
> 255.255.255.255 can be used, but I don't think there is much checking,
> as DHCP traffic works on MAC addresses until an IP address is assigned.

The client will broadcast a dhcp request on 255.255.255.255 the all
ones broadcast address.  In that packet if the device had a previous
IP assignment it will request to be assigned the same address it had
before.  The dhcp server may or may not assign the same address.
Certainly if the address came from a different network then it will
not be able to assign the requested address.

The client requesting its previous address means that you will also
see a lot of foreign addresses in the syslog from the dhcp server.

Bob


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Re: Digital noise from USB DAC device

[Ron Leach]

On 02/03/2015 19:45, Teemu Likonen wrote:


But with high-dynamic classical music I need to
turn amplifier's volume up more than usually and it reveals some sort of
digital noise. Here's a short recording of the sound (file size 1.2MB):

http://koti.kapsi.fi/~dtw/usb-dac-digital-noise.flac

That's from my Debian 7.8 box. But when I use the DAC device in my
Macbook Air (OS X) and play the same music files, there is no noise. So
I think it must be my Debian software stack or a hardware issue.



Gosh, that's a terrible noise.  Sounds as though it has two 
components, as well.  One noise sounds to me as though there might be 
another live 'input' feeding into the mixer stuff.  Such an input 
might not be 'terminated' with a microphone (or might be, and is 
picking something up).


Is your D7 box a 'system' box or a laptop?  Presumably, the D7 box has 
some built-in 'soundcard', maybe on the mother board.  I was wondering 
if it is possible to completely disable the built-in soundcard, in the 
BIOS.


I also have a USB DAC but I haven't run it on D7, neither on a laptop 
nor on a system box.  My DAC device also has 'inputs' (2 x RCA).  If 
your device has inputs, can you check that the 'mixer' does not have 
the USB 'inputs' active?  (Even if they are totally 'turned down', it 
would be better to have them 'off', if that is possible.)


Summarising, check for other 'inputs', and make sure they are disabled 
and not being 'mixed in'.  You could, also, plug the USB DAC inputs 
(if any) into some piece of HiFi so that they are actively 
'terminated' - in case there is an issue with some kind of 
interference pick-up.  (The higher tone in your file is similar to an 
interference I get with one of my audio devices.)


I'm not great on the command line, so I cannot help with the CLI to 
needed to manipulate the sound stuff.


regards, Ron


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Re: Digital noise from USB DAC device

[Teemu Likonen]

Dan Ritter [2015-03-02 15:11:00-05] wrote:

> The static part could easily be introduced in mixing; check alsamixer
> that everything non-essential is turned down to zero.

But there is no mixer, neither software nor hardware. I think the
connection to the DAC is as bit-perfect as it can be.


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Re: Digital noise from USB DAC device

[Dan Ritter]

On Mon, Mar 02, 2015 at 09:45:13PM +0200, Teemu Likonen wrote:
> I got a new USB DAC device (digital to analog converter, a "sound card")
> and I'm having problems with digital noise.
> 
> Music goes directly to the device without any mixers, like this:
> 
> mplayer -af-clr -ao alsa:device=hw=1.0 -format s32le [...]
> 
> And it plays nicely. But with high-dynamic classical music I need to
> turn amplifier's volume up more than usually and it reveals some sort of
> digital noise. Here's a short recording of the sound (file size 1.2MB):
> 
> http://koti.kapsi.fi/~dtw/usb-dac-digital-noise.flac
> 
> That's from my Debian 7.8 box. But when I use the DAC device in my
> Macbook Air (OS X) and play the same music files, there is no noise. So
> I think it must be my Debian software stack or a hardware issue.
> 
> Any ideas about solving this?

The static part could easily be introduced in mixing; check
alsamixer that everything non-essential is turned down to zero.

The tweedle noise sounds like hardware, though. 

-dsr-


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Digital noise from USB DAC device

[Teemu Likonen]

I got a new USB DAC device (digital to analog converter, a "sound card")
and I'm having problems with digital noise.

Music goes directly to the device without any mixers, like this:

mplayer -af-clr -ao alsa:device=hw=1.0 -format s32le [...]

And it plays nicely. But with high-dynamic classical music I need to
turn amplifier's volume up more than usually and it reveals some sort of
digital noise. Here's a short recording of the sound (file size 1.2MB):

http://koti.kapsi.fi/~dtw/usb-dac-digital-noise.flac

That's from my Debian 7.8 box. But when I use the DAC device in my
Macbook Air (OS X) and play the same music files, there is no noise. So
I think it must be my Debian software stack or a hardware issue.

Any ideas about solving this?


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Re: dhcp and foreign ip

[Pol Hallen]

Let's put it this way: in a network belonging to one of
my clients, I often see DHCP addresses being handed out to machines
that do not belong in the network, but there is never a sign of any
further use of those addresses. There is certainly a strong WPA2
passphrase set there.


it's clear Joe, thanks!

whole problem has born from a strange log of hostapd server

thanks for help!

Pol


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Re: dhcp and foreign ip

[Joe]

On Mon, 02 Mar 2015 18:56:46 +0100
Pol Hallen  wrote:

> Hi all :-)
> 
> An easy environment: 1 server 2 lans:
> 
> 192.168.1.0 - local lan1
> 192.168.2.0 - local wlan0
> 
> only one dhcp server manages these 2 lans
> 
> Sometimes I see inside the arp table (from wlan0) a strange IP like:
> 
> 10.168.245.246 or similar
> 
> what does it mean?
> Could be a PC with static IP goes inside my lan (via wireless) or
> what?
> 

Yes. A WAP may relay packets before it knows that the sender is
authenticated, as many authentication mechanisms involve TCP exchanges
and therefore need a valid local IP address. Your DHCP logs may well
show addresses being handed out to these outsiders, but presumably your
other logs do not show anyone actually being authenticated at the time
you see these addresses.

I don't believe that wireless encryption methods are relevant at the
DHCP level, so even though your WAP uses WPA2 and a long password,
which will stop anyone being authenticated, this doesn't affect DHCP
negotiations. Let's put it this way: in a network belonging to one of
my clients, I often see DHCP addresses being handed out to machines
that do not belong in the network, but there is never a sign of any
further use of those addresses. There is certainly a strong WPA2
passphrase set there.

I believe that during DHCP negotiations, the addresses 0.0.0.0 and
255.255.255.255 can be used, but I don't think there is much checking,
as DHCP traffic works on MAC addresses until an IP address is assigned.
I recently mentioned here that my Win8 machine was taking exception to
my DHCP server using 127.0.1.1 as a source address, while every other
OS that has used my network has not even noticed. So an outsider could
be using any source address, and is likely to use the one it last
managed to lease from the correct network.

-- 
Joe


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dhcp and foreign ip

[Pol Hallen]

Hi all :-)

An easy environment: 1 server 2 lans:

192.168.1.0 - local lan1
192.168.2.0 - local wlan0

only one dhcp server manages these 2 lans

Sometimes I see inside the arp table (from wlan0) a strange IP like:

10.168.245.246 or similar

what does it mean?
Could be a PC with static IP goes inside my lan (via wireless) or what?

thanks for help!

Pol


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Purging depends in cinnamon

[Frank]

I recently installed the cinnamon desktop in my Sid installation
which of course brought in Icedove and Ice Weasel as well as a number
of other programs.

Is there any way to eliminate them, as I have been running Thunderbird
and firefox. Trying to purge them results in aptitude wanting to
purge a lot of other stuff, including the cinnamon-desktop-environment.


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Re: In menuconfig when Load an Alternate Configuration File, can't enter the file name

[csanyipal]

csanyi...@gmail.com writes:

> Sven Hartge  writes:
>
>> csanyi...@gmail.com wrote:
>>> Sven Hartge  writes:
>>
 You don't need to be and you should not be logged in as root to
 configure or compile a kernel.
>>
>>> Exactly. I know that. Still, the problem exist, regardless of what
>>> user ( none root or root ) start the menuconfig, this field can't be
>>> edited here. 
>>
>> I cannot reproduce your problem here, regardless of what terminal type I
>> use (xterm, rxvt, terminator, screen, ...). Can you try on a different
>> system? Maybe something is really really wonky with the one you are
>> using right now.
>
> I copy from my headless Power PC box the source directory and cannot
> reproduce the problem neither I.

I copy it to my desktop machine and on it menuconfig works as expected,
I can change the name of .config file in the Field.

> So, what colud be the problem on my headless box?
> As I sed, I'm running on it Debian GNU/Linux Wheezy system.

-- 
Regards from Pal


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x2go login/session via [kgx]dm?

[mad]

Hi!

I'm using x2go and would like to directly connect from my normal desktop
computer with kdm to a x2go session (or login). It should be possible,
but so far I had no luck.

I tried fiddling with xdmcp and x2go thinclient (separately) but so far
no luck.

Can anyone point me in the right direction?

TIA
mad


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Re: creating a simple private repository with reprepro

[Alex Mestiashvili]

On 03/01/2015 07:45 PM, Asaf Dalet wrote:


Is there another tool I can use that doesn't have that limitation?



As Mirko suggested you can use independent reprepro repositories.
I do not have experience with other tools like reprepro..

On Mar 1, 2015 3:42 PM, "Alex Mestiashvili" > wrote:


On 03/01/2015 02:32 PM, Asaf Dalet wrote:
> that means I have to change the changelog before each run of
pbuilder?

Yes, but probably you can automatically update the version before
running the pbuilder.
It depends on your build environment.

Re: USB keyboard required replugging--how to avoid?

[Gary Dale]

On 02/03/15 08:22 AM, Dr. Jennifer Nussbaum wrote:

Hi, i have a USB keyboard that, every week or three, will drop off, and require 
replugging to work again. It is immediately recognized and works fine after I 
do this This was the case on a previous Wheezy system, and it still happens on 
a Jessie box I built.

The problem is that the new box has hard-to-access USB ports, so in order to 
replug the keyboard, I have to remove a panel, so its not just a quick step.

I realize that there's probably no easy solution--if the keyboard doesn't 
respond, i cant enter a command to re-recognize it--but are there any things i 
can try that would help prevent this from happening in the first place?


In order to fix a problem, you first need to identify what is causing 
it. Is there any log entry(s) related to the keyboard?



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Re: In menuconfig when Load an Alternate Configuration File, can't enter the file name

[csanyipal]

Sven Hartge  writes:

> csanyi...@gmail.com wrote:
>> Sven Hartge  writes:
>
>>> You don't need to be and you should not be logged in as root to
>>> configure or compile a kernel.
>
>> Exactly. I know that. Still, the problem exist, regardless of what
>> user ( none root or root ) start the menuconfig, this field can't be
>> edited here. 
>
> I cannot reproduce your problem here, regardless of what terminal type I
> use (xterm, rxvt, terminator, screen, ...). Can you try on a different
> system? Maybe something is really really wonky with the one you are
> using right now.

I copy from my headless Power PC box the source directory and cannot
reproduce the problem neither I.

So, what colud be the problem on my headless box?
As I sed, I'm running on it Debian GNU/Linux Wheezy system.

-- 
Regards from Pal


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USB keyboard required replugging--how to avoid?

[Dr. Jennifer Nussbaum]

Hi, i have a USB keyboard that, every week or three, will drop off, and require 
replugging to work again. It is immediately recognized and works fine after I 
do this This was the case on a previous Wheezy system, and it still happens on 
a Jessie box I built.

The problem is that the new box has hard-to-access USB ports, so in order to 
replug the keyboard, I have to remove a panel, so its not just a quick step.

I realize that there's probably no easy solution--if the keyboard doesn't 
respond, i cant enter a command to re-recognize it--but are there any things i 
can try that would help prevent this from happening in the first place?


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Re: Trying to install nvidia-settings

[James Allsopp]

Ah, yes that's worked perfectly.

Thanks
James

On 27 February 2015 at 16:46, Reco  wrote:

>  Hi.
>
> On Fri, 27 Feb 2015 16:34:03 +
> James Allsopp  wrote:
>
> > Hi,
> > I'm trying to install nvidia-settings but I'm not sure which option to
> use.
> > I don't want to break anything or leave the system in a bit of a mess.
> > Here's what happens,
> > james@Hawaiian:~$ sudo aptitude install nvidia-settings
> > The following NEW packages will be installed:
> >   libxnvctrl0{a} nvidia-settings pkg-config{a}
> > 0 packages upgraded, 3 newly installed, 0 to remove and 68 not upgraded.
> > Need to get 907 kB of archives. After unpacking 1,927 kB will be used.
> > The following packages have unmet dependencies:
> >  nvidia-alternative : Breaks: nvidia-settings (< 319.49) but 304.88-1 is
> to
> > be installed.
>
> Apparently you have nvidia-glx installed from the backports.
> So, correct way to install nvidia-settings would be
>
> sudo aptitude -t wheezy-backports install nvidia-settings
>
> Reco
>
>
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>

Getty Issue

[gianluca]

Hello list!
This is my  first e-mail to this ML, so please be patient.

SYSTEM:
I am working on a deboostrapped chrooted Debian Wheezy on our board (ARM 
based - i.MX28 SoC Processor). This board has USB Host A type connector, 
USB - OTG (microUSB) Device connector, a LVDS display, external microSD 
Card and internal 2 Gbytes eMMC chip.


I built this system in late 2012 and everything seems to be working ok.

Now I am achieving to use a usb-keyboard in my application @ startup 
(rc.local). My application is Qt-based (Qt 4.8.2).


The Qt keyboard driver is looking for tty1 as input device.

Now the problem:

the /etc/inittab has this line:


1:2345:respawn:/sbin/getty 38400 tty1


so I can plug-in a usb-keyboard and I can login in this machine, and 
this is good.


But, the Qt application is ignoring every keypress/release in the USB 
keyboard because everything is passed to the getty/login program.


It would be good if I duplicate all inputs from the usb-keyboard to go 
to the getty __AND__ the Qt application.


How can achieve that?

My kernel commandline has:


console=tty0


as the last command, just to be sure I can see the debian booting into 
the LCD Screen.


Any hint or helpful trick will be greatly appreciated.

Last but not least, just for your reference, if I comment out the 
/etc/inttab line (so not having any getty login on tty1) my Qt 
Application is working good.


Best regards,
--
Eurek s.r.l.  |
Electronic Engineering| http://www.eurek.it
via Celletta 8/B, 40026 Imola, Italy  | Phone: +39-(0)542-609120
p.iva 00690621206 - c.f. 04020030377  | Fax:   +39-(0)542-609212


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Re: jessie: Firefox download dialog unusable

[Brad Rogers]

On Sun, 01 Mar 2015 22:14:35 -0500
Ric Moore  wrote:

Hello Ric,

>Yup, that's the one. Check "about" in firefox/iceweasle to see if you 
>have 36.0

V36, from Debian experimental.

>If you still have 35 I'd pin it for darn sure. I have version 4.9.25 
>installed of helper.

Ah, a slight difference there: I'm one point behind.  I'll stop helper
auto updating.  Thinking about it, I have noticed occasional issues with
some sites (youtube comes to mind) but things seem to work okay after a
page reload, and I'm hardly what you'd call a hard core user of the
plugin, so maybe I've just been lucky.

-- 
 Regards  _
 / )   "The blindingly obvious is
/ _)radnever immediately apparent"
But they didn't tell him the first two didn't count
Tin Soldiers - Stiff Little Fingers


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