Wierd devc-ser8250 behaviour during USB input

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1

Hi NG,

I’m actually expieriencing a wierd phenomenon when using a USB mouse
or keyboard. Here’s the scenario:

ACER Tower PC (VT72)
USB keyboard + mouse (both marked ‘supported’ in BIOS)
Two on board serial ports (classical COM1 + COM2)

Neutrino 6.2.1 (PE)
No devu-* running

Everything seems to work find (Photon, mouse, keyboard, network, …),
but any communication on ‘COM1’ is disturbed, when the mouse is moved
or the keyboard is used. ‘disturbed’ means: incoming characters get
lost, probably their interrupts. The interrupts of the USB
devices (11) and COM1 (4) are definitely not identical.

I tried to check this with a linux installation on the same machine,
but I couldn’t reproduce it. So I’m assuming a neutrino problem here.

Any hints?

TIA,

Karsten.


\

| / | __ ) | Karsten.Hoffmann@mbs-software.de MBS-GmbH
| |/| | _ _ \ Phone : +49-2151-7294-38 Karsten Hoffmann
| | | | |) |__) | Fax : +49-2151-7294-50 Roemerstrasse 15
|| ||// Mobile: +49-172-3812373 D-47809 Krefeld

2

Did I hit the wrong newsgroup – or am I really the only one :frowning:


Karsten.Hoffmann@mbs-software.de wrote:

Hi NG,

I’m actually expieriencing a wierd phenomenon when using a USB mouse
or keyboard. Here’s the scenario:

ACER Tower PC (VT72)
USB keyboard + mouse (both marked ‘supported’ in BIOS)
Two on board serial ports (classical COM1 + COM2)

Neutrino 6.2.1 (PE)
No devu-* running

Everything seems to work find (Photon, mouse, keyboard, network, …),
but any communication on ‘COM1’ is disturbed, when the mouse is moved
or the keyboard is used. ‘disturbed’ means: incoming characters get
lost, probably their interrupts. The interrupts of the USB
devices (11) and COM1 (4) are definitely not identical.

I tried to check this with a linux installation on the same machine,
but I couldn’t reproduce it. So I’m assuming a neutrino problem here.

Any hints?

TIA,

Karsten.
\

–

| / | __ ) | Karsten.Hoffmann@mbs-software.de MBS-GmbH
| |/| | _ _ \ Phone : +49-2151-7294-38 Karsten Hoffmann
| | | | |) |__) | Fax : +49-2151-7294-50 Roemerstrasse 15
|| ||// Mobile: +49-172-3812373 D-47809 Krefeld

3

Karsten.Hoffmann@mbs-software.de wrote:

Hi NG,

I’m actually expieriencing a wierd phenomenon when using a USB mouse
^^^^^^^^^^^^^^^^^
or keyboard. Here’s the scenario:

ACER Tower PC (VT72)
USB keyboard + mouse (both marked ‘supported’ in BIOS)
Two on board serial ports (classical COM1 + COM2)

Neutrino 6.2.1 (PE)
No devu-* running
^^^^^^^^^^^^^^^^^

Are you using USB deviced or not??

Armin

Everything seems to work find (Photon, mouse, keyboard, network, …),
but any communication on ‘COM1’ is disturbed, when the mouse is moved
or the keyboard is used. ‘disturbed’ means: incoming characters get
lost, probably their interrupts. The interrupts of the USB
devices (11) and COM1 (4) are definitely not identical.

I tried to check this with a linux installation on the same machine,
but I couldn’t reproduce it. So I’m assuming a neutrino problem here.

Any hints?

TIA,

Karsten.

4

Armin Steinhoff <a-steinhoff@web.de> wrote:

Karsten.Hoffmann@mbs-software.de > wrote:
Hi NG,

I’m actually expieriencing a wierd phenomenon when using a USB mouse
^^^^^^^^^^^^^^^^^
or keyboard. Here’s the scenario:

ACER Tower PC (VT72)
USB keyboard + mouse (both marked ‘supported’ in BIOS)
Two on board serial ports (classical COM1 + COM2)

Neutrino 6.2.1 (PE)
No devu-* running
^^^^^^^^^^^^^^^^^

Are you using USB deviced or not??

That exactly is the wierd thing: there’s no USB driver running, but
nevertheless the serial communication is disturbed …

Guess, the (unused) USB interrupt is sharing the same interrupt as the
NIC, but there’s no malfunction of the network layers.

\

| / | __ ) | Karsten.Hoffmann@mbs-software.de MBS-GmbH
| |/| | _ _ \ Phone : +49-2151-7294-38 Karsten Hoffmann
| | | | |) |__) | Fax : +49-2151-7294-50 Roemerstrasse 15
|| ||// Mobile: +49-172-3812373 D-47809 Krefeld

5

Karsten.Hoffmann@mbs-software.de wrote in news:b8gshj$us2$1@mbs-
software.de:

Armin Steinhoff <> a-steinhoff@web.de> > wrote:
Karsten.Hoffmann@mbs-software.de > wrote:
Hi NG,

I’m actually expieriencing a wierd phenomenon when using a USB mouse
^^^^^^^^^^^^^^^^^
or keyboard. Here’s the scenario:

ACER Tower PC (VT72)
USB keyboard + mouse (both marked ‘supported’ in BIOS)
Two on board serial ports (classical COM1 + COM2)

Neutrino 6.2.1 (PE)
No devu-* running
^^^^^^^^^^^^^^^^^

Are you using USB deviced or not??

That exactly is the wierd thing: there’s no USB driver running, but
nevertheless the serial communication is disturbed …

Guess, the (unused) USB interrupt is sharing the same interrupt as the
NIC, but there’s no malfunction of the network layers.

This is probably a naive response as I know nothing of USB or ACER.

Enabling -t x option (16550 FIFO) fixed our lost characters problem using
the devc-ser8250 driver.

Good Luck
Jan

Jan Stefan

Software Engineer
Minnetronix Inc.

www.minnetronix.com

6

Karsten.Hoffmann@mbs-software.de wrote:

Hi NG,

I’m actually expieriencing a wierd phenomenon when using a USB mouse
or keyboard. Here’s the scenario:

ACER Tower PC (VT72)
USB keyboard + mouse (both marked ‘supported’ in BIOS)
Two on board serial ports (classical COM1 + COM2)

Neutrino 6.2.1 (PE)
No devu-* running

Everything seems to work find (Photon, mouse, keyboard, network, …),
but any communication on ‘COM1’ is disturbed, when the mouse is moved
or the keyboard is used. ‘disturbed’ means: incoming characters get
lost, probably their interrupts. The interrupts of the USB
devices (11) and COM1 (4) are definitely not identical.

Just for the files :slight_smile:) :

With V6.2.1 Patch B this problem disappeared …

–

| / | __ ) | Karsten.Hoffmann@mbs-software.de MBS-GmbH
| |/| | _ _ \ Phone : +49-2151-7294-38 Karsten Hoffmann
| | | | |) |__) | Fax : +49-2151-7294-50 Roemerstrasse 15
|| ||// Mobile: +49-172-3812373 D-47809 Krefeld