The error messages could be something like "No modem detected", "Modem not responding", or (strange) "You are already online" (from Minicom). If you have installed an internal modem (serial port is builtin) or are using an external one and don't know what serial port it's connected to then the problem is to find the serial port. See My Serial Port is Physically There but Can't be Found. This section is about finding out which serial port has the modem on it.
There's a program that looks for modems on commonly used serial ports called "wvdialconf". Just type "wvdialconf <a-new-file-name>". It will create the new file as a configuration file but you don't need this file unless you are going to use "wvdial" for dialing. See What is wvdialconf ? Unfortunately, if your modem is in "online data" mode, wvdialconf will report "No modem detected" See No response to AT
Your problem could be due to a winmodem (or the like) which usually can't be used with Linux. See Software-based Modems (winmodems). The "setserial program may be used to detect serial ports but will not detect modems on them. Thus "wvdialconf" is best to try first.
Another way try to find out if there's a modem on a port is to start "minicom" on the port (after first setting up minicom for the correct serial port --you will need to save the setup and then exit minicom and start it again). Then type "AT" and you should see OK (or 0 if it's set for "digit result codes"). The results may be:
The modem should send you "OK" in response to your "AT" which you type to the modem (using minicom or the like). If you don't see "OK" (and in most cases don't even see the "AT" you typed either) then the modem is not responding (often because what you type doesn't even get to the modem).
A common cause is that there is no modem on the serial port you are typing to. For the case of an internal modem, that serial port likely doesn't exist either. That's because the PnP modem card (which has a built-in serial port) has either not been configured (by isapnp or the like) or has been configured incorrectly. See My Serial Port is Physically There but Can't be Found.
If what you type is really getting thru to a modem, then the lack of response could be due to the modem being in "online data" mode where it can't accept any AT commands. You may have been using the modem and then abruptly disconnected (such as killing the process with signal 9). In that case your modem did not get reset to "command mode" where it can interact to AT commands. Thus the message from minicom "You are already online. Hangup first." Well, you are sort of online but you are may not be connected to anything over the phone line. Wvdial will report "modem not responding" for the same situation.
To fix this as a last resort you could reboot the computer. Another way to try to fix this is to send +++ to the modem to tell it to escape back to "command mode" from "online data mode". On both sides of the +++ sequence there must be about 1 second of delay (nothing sent during "guard time"). This may not work if another process is using the modem since the +++ sequence could wind up with other characters inserted in between them or after the +++ (during the guard time). Ironically, even if the modem line is idle, typing an unexpected +++ is likely to set off an exchange of control packets (that you never see) that will violate the required guard time so that the +++ doesn't do what you wanted. +++ is usually in the string that is named "hangup string" so if you command minicom (or the like) to hangup it might work. Another way to do this is to just exit minicom and then run minicom again.
What this means depends on what program sent it. The modem could actually be in use (busy). Another cause reported for the SuSE distribution is that there may be two serial drivers present instead of one. One driver was built into the kernel and the second was a module.
In kppp, this message is sent when an attempt to get/set the serial port "stty" parameters fails. (It's similar to the "Input/output error" one may get when trying to use "stty -F /dev/ttySx"). To get a few of these stty parameters, the true address of the port must be known to the driver. So the driver may have the wrong address. The setserial" command will display what the driver thinks but it's likely wrong in this case. So what the "modem busy" really means is that the serial port (and the modem) can't be found.
If you have a pci modem, then use one of these commands: lspci, or cat /proc/pci, or dmesg to find the correct address and irq of the modem's serial port. Then check to see if "setserial" shows the same thing. If not, you need to run a script at boot-time which contains a setserial command that will tell the driver the correct address and irq. The reason that the driver has it wrong may be due to failure of the kernel to understand the lspci data correctly. You might notice this in a boot-time message.
There must be very low noise on the line for it to work at even close to 56k. Some phone lines are so bad that the speeds obtainable are much slower than 56k (like 28.8k or even slower). Sometimes extension phones connected to the same line can cause problems. To test this you might connect your modem directly at the point where the telephone line enters the building with the feeds for everything else on that line disconnected (if others can tolerate such a test).
Flow control (both at your PC and/or modem-to-modem) may not be enabled. For the uploading case: If you have set a high DTE speed (like 115.2k) then flow from your modem to your PC may work OK but uploading flow in the other direction will not all get thru due to the telephone line bottleneck. This will result in many errors and the resending of packets. It may thus take far too long to send a file. In some cases, files don't make it thru at all.
For the downloading case: If you're downloading long uncompressed files or web pages (and your modem uses data compression) or if you've set a low DTE speed, then downloading may also be broken due to no flow control.
Make sure you are using the correct syntax for your version of
init. The different
init's that are out there use different
syntax in the
/etc/inittab file. Make sure you are using the
correct syntax for your version of
Id "S3" is just an example. In this case look on the line which
starts with "S3" in
/etc/inittab and calls getty. This line
causes the problem. Make sure the syntax for this line is correct and
that the device (ttyS3) exists and can be found. If the modem has
negated CD and getty opens the port, you'll get this error message
since negated CD will kill getty. Then getty will respawn only to be
killed again, etc. Thus it respawns over and over (too fast). It
seems that if the cable to the modem is disconnected or you have the
wrong serial port, it's just like CD is negated. All this can occur
when your modem is chatting with getty. Make sure your modem is
configured correctly. Look at AT commands
If you use uugetty, verify that your
/etc/gettydefs syntax is
correct by doing the following:
linux# getty -c /etc/gettydefs
This can also happen when the
uugetty initialization is failing.
uugetty Still Doesn't Work.
This can happen when your modem doesn't reset when DTR is dropped.
Greg Hankins saw his RD and SD LEDs go crazy when this happened.
You need to have your modem reset. Most Hayes compatible modems do
&D3, but for USR Courier, SupraFax, and other
modems, you must set
S13=1 for USR Courier).
Check your modem manual (if you have one).
There is a
DEBUG option that comes with
getty_ps. Edit your
DEBUG=NNN. Where NNN is one of the following
combination of numbers according to what you are trying to debug:
D_OPT 001 option settings D_DEF 002 defaults file processing D_UTMP 004 utmp/wtmp processing D_INIT 010 line initialization (INIT) D_GTAB 020 gettytab file processing D_RUN 040 other runtime diagnostics D_RB 100 ringback debugging D_LOCK 200 uugetty lockfile processing D_SCH 400 schedule processing D_ALL 777 everything
DEBUG=010is a good place to start.
If you are running
syslogd, debugging info
will appear in your log files. If you aren't running
info will appear in
/tmp/getty:ttySN for debugging
uugetty, and in
/var/adm/getty.log. Look at the
debugging info and see what is going on. Most likely, you will need
to tune some of the parameters in your config
file, and reconfigure your modem.
You could also try
mgetty. Some people have better luck with
If a physical device (such as a modem) doesn't work at all it may mean that the device is not at the I/O address that setserial thinks it's at. It could also mean (for a PnP card) that is doesn't yet have an address. Thus it can't be found.
Check the BIOS menus and BIOS messages. For the PCI bus use lspci or
scanpci. If it's an ISA bus PnP serial port, try "pnpdump --dumpregs"
and/or see Plug-and-Play-HOWTO. Using "scanport" will scan all ISA
bus ports and may discover an unknown port that could be a serial port
(but it doesn't probe the port). It could hang your PC. You may try
probing with setserial. See
nothing seems to get thru the port it may be accessible but have a bad
Extremely Slow: Text appears on the screen slowly after long delays. Use
setserial -g to
see what the serial driver thinks and check for IRQ and I0 address
conflicts. Even if you see no conflicts the driver may have incorrect
information (view it by "setserial" and conflicts may still exist.
If two ports have the same IO address then probing it will erroneously indicate only one port. Plug-and-play detection will find both ports so this should only be a problem if at least one port is not plug-and-play. All sorts of errors may be reported/observed for devices illegally "sharing" a port but the fact that there are two devices on the same a port doesn't seem to get detected (except hopefully by you). In the above case, if the IRQs are different then probing for IRQs with setserial might "detect" this situation by failing to detect any IRQ. See Probing.
It's likely mis-set/conflicting interrupts. Here are some of the symptoms which will happen the first time you try to use a modem, terminal, or serial printer. In some cases you type something but nothing appears on the screen until many seconds later. Only the last character typed may show up. It may be just an invisible <return> character so all you notice is that the cursor jumps down one line. In other cases where a lot of data should appear on the screen, only a batch of about 16 characters appear. Then there is a long wait of many seconds for the next batch of characters. You might also get "input overrun" error messages (or find them in logs).
For more details on the symptoms and why this happens see
If it involves Plug-and-Play devices, see also Plug-and-Play-HOWTO.
As a quick check to see if it really is an interrupt problem, set the IRQ to 0 with "setserial". This will tell the driver to use polling instead of interrupts. If this seems to fix the "slow" problem then you had an interrupt problem. You should still try to solve the problem since polling uses excessive computer resources.
Checking to find the interrupt conflict may not be easy since Linux supposedly doesn't permit any interrupt conflicts and will send you a /dev/ttyS?: Device or resource busy error message if it thinks you are attempting to create a conflict. But a real conflict can be created if "setserial" has told the kernel incorrect info. The kernel has been lied to and thus doesn't think there is any conflict. Thus using "setserial" will not reveal the conflict (nor will looking at /proc/interrupts which bases its info on "setserial"). You still need to know what "setserial" thinks so that you can pinpoint where it's wrong and change it when you determine what's really set in the hardware.
What you need to do is to check how the hardware is set by checking jumpers or using PnP software to check how the hardware is actually set. For PnP run either "pnpdump --dumpregs" (if ISA bus) or run "lspci" (if PCI bus). Compare this to how Linux (e.g. "setserial") thinks the hardware is set.
One reason may be that whatever is on the serial port (such as a modem, terminal, printer) doesn't work as fast as you thought it did.
Another possible reason is that you have an obsolete serial port: UART 8250, 16450 or early 16550 (or the serial driver thinks you do). See
Use "setserial -g /dev/ttyS*". If it shows anything less than a 16550A, this may be your problem. If you think that "setserial" has it wrong check it out. See What is Setserial for more info. If you really do have an obsolete serial port, lying about it to setserial will only make things worse.
Linux does not do any IRQ detection on startup. When the serial module loads it only does serial device detection. Thus, disregard what it says about the IRQ, because it's just assuming the standard IRQs. This is done, because IRQ detection is unreliable, and can be fooled. But if and when setserial runs from a start-up script, it changes the IRQ's and displays the new (and hopefully correct) state on on the startup screen. If the wrong IRQ is not corrected by a later display on the screen, then you've got a problem.
So, even though I have my
ttyS2 set at IRQ 5, I still see
at first when Linux boots. (Older kernels may show "ttyS02" as "tty02" which is the same as ttyS2). You may need to use
ttyS02 at 0x03e8 (irq = 4) is a 16550A
setserialto tell Linux the IRQ you are using.
Check the file permissions on this port with "ls -l /dev/ttyS?"_ If you own the ttyS? then you need read and write permissions: crw with the c (Character device) in col. 1. It you don't own it then it should show rw- in cols. 8 & 9 which means that everyone has read and write permission on it. Use "chmod" to change permissions. There are more complicated ways to get access like belonging to a "group" that has group permission.
This means that an operation requested by setserial, stty, etc. couldn't be done because the kernel doesn't support doing it. Formerly this was often due to the "serial" module not being loaded. But with the advent of PnP, it may likely mean that there is no modem (or other serial device) at the address where the driver (and setserial) thinks it is. If there is no modem there, commands (for operations) sent to that address obviously don't get done. See What is set in my serial port hardware?
If the "serial" module wasn't loaded but "lsmod" shows you it's now loaded it might be the case that it's loaded now but wasn't loaded when you got the error message. In many cases the module will automatically loaded when needed (if it can be found). To force loading of the "serial" module it may be listed in the file: /etc/modules.conf or /etc/modules. The actual module should reside in: /lib/modules/.../misc/serial.o.
When a port is "opened" by a program a lockfile is created in /var/lock/. Wrong permissions for the lock directory will not allow a lockfile to be created there. Use "ls -ld /var/lock" to see if the permissions are OK: usually rwx for everyone (repeated 3 times). If it's wrong, use "chmod" to fix it. Of course, if there is no "lock" directory no lockfile can be created there. For more info on lockfiles see the Serial-HOWTO subsection: "What Are Lock Files".
This means that someone else (or some other process) is supposedly using the serial port. There are various ways to try to find out what process is "using" it. One way is to look at the contents of the lockfile (/var/lock/LCK...). It should be the process id. If the process id is say 100 type "ps 100" to find out what it is. Then if the process is no longer needed, it may be gracefully killed by "kill 100". If it refuses to be killed use "kill -9 100" to force it to be killed, but then the lockfile will not be removed and you'll need to delete it manually. Of course if there is no such process as 100 then you may just remove the lockfile but in most cases the lockfile should have been automatically removed if it contained a stale process id (such as 100).
This means that the device you are trying to access (or use) is supposedly busy (in use) or that a resource it needs (such as an IRQ) is supposedly being used by another device (the resource is "busy"). This message is easy to understand if it only means that the device is busy (in use). But it often means that a resource is in use. What makes it even more confusing is that in some cases neither the device not the resources that it needs are actually "busy".
The ``resource busy'' part often means (example for
ttyS2 since another device is using ttyS2's
interrupt.'' The potential interrupt conflict is inferred from what
"setserial" thinks. A more accurate error message would be ``Can't
ttyS2 since the setserial data (and kernel data) indicates
that another device is using
ttyS2's interrupt''. If two devices
use the same IRQ and you start up only one of the devices, everything
is OK because there is no conflict yet. But when you next try to
start the second device (without quitting the first device) you get a
"... busy" error message. This is because the kernel only keeps track
of what IRQs are actually in use and actual conflicts don't happen
unless the devices are in use (open). The situation for I/O address
(such as 0x3f8) conflict is similar.
This error is sometimes due to having two serial drivers: one a module and the other compiled into the kernel. Both drivers try to grab the same resources and one driver finds them "busy".
There are two possible cases when you see this message:
ttyS2can't be used is that setserial erroneously predicts a conflict.
What you need to do is to find the interrupt setserial thinks
ttyS2 is using. Look at /proc/tty/driver/serial (if you have
it). You should also be able to find it with the "setserial" command
ttyS2. But due to a bug (reported by me in Nov. 2000) you
get the same "... busy" error message when you try this with
To try to resolve this problem reboot or: exit or gracefully kill all likely conflicting processes. If you reboot: 1. Watch the boot-time messages for the serial ports. 2. Hope that the file that runs "setserial" at boot-time doesn't (by itself) create the same conflict again.
If you think you know what IRQ say
ttyS2 is using then you may
look at /proc/interrupts to find what else (besides another serial
port) is currently using this IRQ. You might also want to double
check that any suspicious IRQs shown here (and by "setserial") are
correct (the same as set in the hardware). A way to test whether or
not it's a potential interrupt conflict is to set the IRQ to 0
(polling) using "setserial". Then if the busy message goes away, it
was likely a potential interrupt conflcit. It's not a good idea to
leave it permanently set at 0 since it will make the CPU work too
You may have typed "ttys" instead of "ttyS". You will see this error message if you try to use the setserial command for any device that is not a serial port. It also may mean that the serial port is in use (busy or opened) and thus the attempt to get/set parameters by setserial or stty failed. It could also mean that there isn't any serial port at the IO address that setserial thinks your port is at.
This is an overrun of the hardware FIFO buffer and you can't increase its size. See
There could be some other program running on the port. Use "top" (provided you've set it to display the port number) or "ps -alxw". Look at the results to see if the port is being used by another program. Be on the lookout for the gpm mouse program which often runs on a serial port.
These are some of the programs you might want to use in troubleshooting: