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Title:
Opening /dev/ttyUSB0 hangs, pl2303.ko module
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Alexander Menk, if you have a bug in Ubuntu, could you please file a new report
by executing the following in a terminal:
ubuntu-bug linux
For more on this, please see the Ubuntu Kernel team article:
https://wiki.ubuntu.com/KernelTeam/KernelTeamBugPolicies#Filing_Kernel_Bug_reports
the Ubuntu
Stefan Felkel / Nuno Lucas, if you have a bug in Ubuntu, could you please file
a new report by executing the following in a terminal:
ubuntu-bug linux
For more on this, please see the Ubuntu Kernel team article:
https://wiki.ubuntu.com/KernelTeam/KernelTeamBugPolicies#Filing_Kernel_Bug_reports
[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete = Expired
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I noticed this bug today, after upgrading to 12.04.1.
It seems Michael Stevens (#12) is right and it's a change on the kernel
semantics, because to me this happens with regular serial ports (I have a
serial port PCI card to add 2 more ports to the machine).
This is a serious regression on the
Extension to my comment above: Reading is then only possible byte by byte.
We solved the problem by an udev rule that modprobes the pl2303 (_once_) as
described at the beginning.
That's working, but we appreciate a nicer solution or a fix.
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We have 12.04 and experienced this problem.
Usage with gtkterm - no problem, communication ok.
With blocking usage, it blocked (sometimes) on open using:
fd = open(/dev/ttyUSB0, O_RDWR | O_NOCTTY | O_SYNC );
or
fd = open(/dev/ttyUSB0, O_RDWR | O_NOCTTY );
After hours of testing we
John Stebbins, this bug was reported a while ago and there hasn't been
any activity in it recently. We were wondering if this is still an
issue? Can you try with the latest development release of Ubuntu? ISO CD
images are available from http://cdimage.ubuntu.com/releases/ .
If it remains an
In ubuntu 12.04 I do not have this issue anymore. I think that it was
already solved in ubuntu 11.10 .
-Oz
On 07/25/2012 09:57 AM, Christopher M. Penalver wrote:
John Stebbins, this bug was reported a while ago and there hasn't been
any activity in it recently. We were wondering if this is
Still an issue with the pl2303 module in Precise. Workaround works.
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Title:
Opening /dev/ttyUSB0 hangs, pl2303.ko module
To manage notifications
Hi
I had the same problem with an RS232 express card solved using the workaround
but now i must execute the 2 commands every time i reboot the pc.
Could you, please, tell me how to avoid this little inconvenience ?
thanks.
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Workaround is here:
http://ubuntuforums.org/showthread.php?p=11579035#post11579035
- CH
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Title:
Opening /dev/ttyUSB0 hangs, pl2303.ko module
To
I have a couple of older TEMPer USB-to-Serial Thermometers that depend
on this module, so Michael Stevens comment (#12) about the behaviour was
very helpful for me...
The programs the TEMPer's depend on (TEMPer.c and temper-read-temp
(temper-read-temp, part of temper-tools-1.0 from
** Changed in: linux (Ubuntu)
Importance: Undecided = Medium
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Title:
Opening /dev/ttyUSB0 hangs, pl2303.ko module
To manage notifications
** Description changed:
I have a program that I wrote that controls an Onkyo audio receiver through
it's serial port. The serial port is opened like this:
- open(/dev/ttyUSB0, O_RDWR | O_NOCTTY);
+ open(/dev/ttyUSB0, O_RDWR | O_NOCTTY);
open never returns. This worked fine in
upstream kernel patch d14fc1a (USB: serial: handle Data Carrier Detect
changes) is likely the remedy
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Title:
Opening /dev/ttyUSB0 hangs,
Same probleme, ubuntu 11.04 doesn't resolve it
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Title:
Opening /dev/ttyUSB0 hangs, pl2303.ko module
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I think even if this isn't a bug against the kernel, it's still a bug
that leaves a lot of users in the lurch. Maybe rather than marking it
as invalid, it would be better to figure out what to assign it to. For
many people, for a variety of reasons, patching the source code to their
affected
I was hit with this problem using my GPS tracking application on a
2.6.38 Kernel. After much researching it seems this is NOT a driver bug
but a CHANGE in the kernel Serial API semantics.
What has happened is that the API now blocks when a Serial device is not
indicating it is ready. This
Michael, thanks for the information. Can you elaborate on how removing
then reinstalling this kernel module (pl2303) works around the new
kernel semantics. It doesn't seem like it should work if the problem is
really with the hardware flow control of the device. So I'm wondering
if there isn't
I was wondering about that phenomena too! For me removing and
reinstalling pl2303 only worked for a short period, after about 30s it
stopped working.
As far as I can tell from the comments on the bug the semantics changed
somewhere in Maverik so CLOCAL is not set for all USB serial drivers.
Same problem with generic PL-2303 adapter. Workaround worked.
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Title:
Opening /dev/ttyUSB0 hangs, pl2303.ko module
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Same problem with a PL-2303HX chip (Prolific). I tried to chmod 777
/dev/ttyUSB0, but it was useless.
The workaround worked, thank you ;-)
Nevertheless, it worked perfectly with gtkterm !?!
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Same issue with Pololu USB-RS232 converter. I think this is confirmed.
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Status: New = Confirmed
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Title:
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Title:
Opening /dev/ttyUSB0 hangs, pl2303.ko module
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Same problem with cp210x, but I was able to make it work.
After initialization in non-blocking mode it starts working well in blocking
mode.
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You received this bug notification because you are a member of
Same problem with a cp210x module -- except the workaround doesn't work
Used to work in 10.04
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May or may not be related to
http://forum.nginx.org/read.php?30,135400,135554
Certainly, the device I'm connecting to doesn't set DCD. The app I'm
trying is closed-source, though, so I've asked those guys to change it
to test.
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Opening /dev/ttyUSB0 hangs, pl2303.ko module
You can check for DCD with statserial /dev/ttyUSB0
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Like Berend, I have hit this problem setting up my cp210x based-LCD
display with the SureElec driver in lcdproc. Exact same problem that is
described for this bug: a call to open in the LCD driver that never
returns. The workaround mentioned doesn't work for me.
I have found as an odd workaround
I can confirm this bug.
Tried to connect my Garmin eTrex GPS via USB/Serial cable. Trying to read data
from the device gpsbabel simply hangs. After the modprobe workaround it works...
Please fix!
Regards,
Andreas Weller
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Opening /dev/ttyUSB0 hangs, pl2303.ko module
Same probleme here. The workaround works fine :)
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