- A patch for Theodore Ts'o's Linux serial driver which adds very ugly support for Actiontec's 56K Internal PCI Call Waiting Modem. This patch causes the driver to be hard-wired to auto-detect this modem. I believe that the Lucent Venus chipset may be buggy, and am currently working with Lucent, Actiontec, and Theodore Ts'o to fix it.
- I have written open letters to Agere and Actiontec.
I wrote a kernel module to demonstrate the problems I am having with the Venus chipset. The module writes a value to the interrupt enable register (IER) on one's modem. It then immediately reads the value stored in the IER. Reading a value from the IER that does not equal the value written to it seems to represent a bug in the chipset. Theodore Ts'o's serial driver makes extensive use of a modem's IER when it performs detection operations; thus detecting a Venus-based modem often fails.
To try this test on your own machine, download the kernel module and read the directions included in the source file.