[Bug 874181] Re: brltty daemon prevents creation of ttyUSB0 device link

[Jonas Norling]

Re #25:
I tested the updated brltty package with Ubuntu 11.10 and a cp210x converter 
(USB id 10c4:ea60).
*It works fine for me now.*

Test procedure:
* Installed brltty (I had removed it as a workaround for this bug)
* Verified that the bug was still there
* Enabled oneiric-proposed
* sudo apt-get update; sudo apt-get install brltty (it installed version 
4.2-8ubuntu5.1)
* Rebooted
* Plugged in the USB device. Syslog no longer indicates any ambitions from 
brltty to bind to the device. There is now a /dev/ttyUSB0 device node.

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https://bugs.launchpad.net/bugs/874181

Title:
  brltty daemon prevents creation of ttyUSB0 device link

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[Bug 879819] [NEW] cp210x USB-to-serial conflicts with brltty

[Jonas Norling]

*** This bug is a duplicate of bug 874181 ***
https://bugs.launchpad.net/bugs/874181

Public bug reported:

The brltty daemon tries to use a cp210x USB-to-serial adaptor as a
braille device (so I don't get a /dev/ttyUSB0 node). Expected behaviour:
brltty shouldn't touch the device, because it's not a braille device.

The device is a ID 10c4:ea60 Cygnal Integrated Products, Inc. CP210x Composite 
Device.
Ubuntu 11.10.
Package version: brltty_4.2-8ubuntu5_amd64.deb.
A workaround is to remove the brltty package, which I have done 
enthusiastically.

** Affects: brltty (Ubuntu)
 Importance: Undecided
 Status: New

** This bug has been marked a duplicate of bug 874181
   brltty daemon prevents creation of ttyUSB0 device link

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https://bugs.launchpad.net/bugs/879819

Title:
  cp210x USB-to-serial conflicts with brltty

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[Bug 491329] Re: jackd cannot be started in realtime mode on Karmic if there is not enough free space in /dev/shm

[Jonas Norling]

I experience what appears to be the same problem on my laptop with a USB
sound device.

I'm running Karmic. Pulseaudio is enabled but the USB sound device is
set to profile Off in the Sound Preferences GUI, so pulseaudio
shouldn't try to use it (right?). Pulseaudio is allowed to manage the
laptop's internal sound device, though.

Immediately after logging in, pulseaudio has created (around) five 65MB
files in /dev/shm, but only a total of 224kB is actually allocated/used:

jo...@bruno:~$ ls -lsh /dev/shm/
total 224K
4.0K -rw-r- 1 jonas jonas 4.0K 2009-12-25 13:20 mono.5866
 84K -r 1 gdm   gdm65M 2009-12-25 13:20 pulse-shm-3132421645
 32K -r 1 jonas jonas  65M 2009-12-25 13:22 pulse-shm-3183276808
 12K -r 1 jonas jonas  65M 2009-12-25 13:20 pulse-shm-3321423159
 80K -r 1 jonas jonas  65M 2009-12-25 13:22 pulse-shm-3424433770
 12K -r 1 jonas jonas  65M 2009-12-25 13:20 pulse-shm-586544485

When I try to start jackd, pulseaudio starts to fill up its previously
sparse files in /dev/shm. After a few seconds and a lot of swapping
jackd exits with Bus error and my /dev/shm is completely filled:

jo...@bruno:~$ ls -lsh /dev/shm/
total 232M
   0 drwx-- 3 jonas jonas   60 2009-12-25 13:22 jack-1000
4.0K -rw-r- 1 jonas jonas 4.0K 2009-12-25 13:20 mono.5866
 84K -r 1 gdm   gdm65M 2009-12-25 13:20 pulse-shm-3132421645
 65M -r 1 jonas jonas  65M 2009-12-25 13:22 pulse-shm-3183276808
 65M -r 1 jonas jonas  65M 2009-12-25 13:20 pulse-shm-3321423159
 39M -r 1 jonas jonas  65M 2009-12-25 13:22 pulse-shm-3424433770
   0 -r 1 jonas jonas  65M 2009-12-25 13:22 pulse-shm-448440592
 65M -r 1 jonas jonas  65M 2009-12-25 13:20 pulse-shm-586544485

All this happens only when I have @audio - memlock unlimited in my
limits.conf (otherwise jackd says that it can't allocate memory, but
seems to work happily anyway). Sometimes not enough pulseaudio clients
are running to fill up /dev/shm and jackd will start fine. My preferred
workaround is to start jackd on the console before logging in.

My system:
512MB RAM,
USB sound device: ESI U46XL
Ubuntu realtime kernel linux-image-rt 2.6.31.9.10
pulseaudio 1:0.9.19-0ubuntu4, jackd 0.116.1-4ubuntu2

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jackd cannot be started in realtime mode on Karmic if there is not enough free 
space in /dev/shm
https://bugs.launchpad.net/bugs/491329
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