Best of Technical Support

Our experts answer your technical questions.
Best of Technical Support

Modem Works with Old Kernel, Not New One

After an upgrade from Red Hat 7.1 to 7.2, my modem no longer works when I boot into the SMP kernel. It works fine when booting the non-SMP kernel. I have downloaded and compiled the latest stable kernel, and the problem still exists. Under 7.1 the same modem worked fine with the SMP kernel. I have a US Robotics 56K FaxModem (model 3CP5610A) with a Tyan motherboard and dual-Intel Pentium 133.

—Nathan Myers,

Check to see if the modem is detected by the kernel. You can see this with a grep ttyS /var/log/messages*. You will see a list of serial devices; note that some will be built-in on your motherboard.

—Christopher Wingert,

Thank you for including the model number of your modem; it is most useful. A quick search on Google shows that you have a PCI modem, which works slightly differently from old-style ISA modems. The good news is that it is a real modem and not a Winmodem. The best link I found for you is this one: USR also seems to provide an example script for Red Hat here:

—Marc Merlin,

NFS Living in the Past

I have one machine (Red Hat 7.2) that serves the user home directories, which is now an ext3 fs, to several other peripheral machines (all Red Hat 6.2). I've noticed that files updated on the peripheral machines don't get updated on the server, and the changes don't get reflected on the other peripheral machines.

The server exports options (rw, no_root_squash). The client invokes with defaults, nodev, rw. This seems to indicate that the clients are caching, but it never seems to flush (I have a file that was changed a day ago that is still unchanged on the server). I've searched the Web and have found nothing that would help.

—R. K. Owen,

Nothing in NFS should cache a file for a day. I would check the obvious and make extra sure that the clients are indeed writing in an NFS-mounted directory and accessing the NFS server. You also can check that when you modify a file on the server, the clients are seeing the new copy.

—Marc Merlin,

Can StarOffice Import EPS?

My system consists of Red Hat 7.1 with a 933MHz Pentium III. The problem, which occurs with both StarOffice 5.2 and 6.0 beta, is that encapsulated PostScript graphics files (.ps or .eps files) are read as text, not as graphics. This happens with any selection (e.g., Text Document, Presentation, Drawing or Chart). gv shows the correct graphics. So the question is: does StarOffice have the capability to read graphics files in PostScript format and display the graphics rather than the PostScript text? If so, how do you do it?

—John C. Burgess,

The menu item Insert-->Graphics-->From File does understand .eps files.

—Scott Maxwell,

PCI Modem Not Recognized

I recently purchased a US Robotics 56K PCI modem card. It is not a Winmodem, which is why I purchased it. I planned on using it on my dual booting (Windows 98/Linux) system. Windows 98 listed it as device COM5, not the usual COM2.

I went into the Linux side and created a /dev/ttyS4, using setserial to set the port and irq. I made a symbolic link to /dev/modem. When I run minicom, it does not complain that the device isn't there, it just does not seem to do anything. How do I get Linux to recognize my modem? I tried an echo ATH1>/dev/ttyS4, and there is no dial tone in the modem speaker, so I am pretty sure the command is not making it to the modem.

—Tony Preston,

This sounds like the IRQ is not set correctly. You should check the IRQ with lspci -vv. Look for your modem in the list and use setserial to set the IRQ.

—Christopher Wingert,

See for an example of how to set the IRQ with setserial.

—Marc Merlin,