Xonar EEPROM Failure
Xonar D2(X) EEPROM Failure
Sometimes, Xonar D2 or D2X cards randomly fail to be recognized.
The driver refused to load or to install, and in Device Manager, the card is shown as an unknown sound card or as "C-Media Oxygen audio device". Putting the card into another slot or another computer does not help.
This happens when the EEPROM on the card gets overwritten.
(This EEPROM stores the PCI subsystem vendor and product IDs; when it gets overwritten, the main chip cannot read the subsystem IDs and uses a default ID (13F6:8788) which is not recognized by the Xonar driver.)
The exact cause is unknown.
There was a guess that the EEPROM chip can misinterpret certain signals if they happen together with eletrical noise, but the EEPROM is protected against that.
It seems that the problem occurs only with certain computers or motherboards.
Restoring the EEPROM
I have written a small Linux program that can restore the original contents of the EEPROM:
- boot Linux (either from hard drisk or from a live CD);
- download the package directly from <http://www.alsa-project.org/~clemens/oxygen_restore_eeprom.tar.gz>, or download it from Windows and copy it over with a USB stick;
- open a console;
- unpack the package:
tar xvzf oxygen_restore_eeprom.tar.gz
- run the program, as root:
- either run first
- or run
- either run first
- follow the instructions on the screen.
The package also contains a 64-bit version (
oxygen_restore_eeprom_64) for the unlikely case that you're running a 64-bit-only Linux.
The program has been confirmed to work.
So far, five users have reported this problem:
This driver tries to protect against the problem, but it is probable that the problem occurs before any driver is loaded and that this new driver won't be any help.
Version 1.0.19: Download page
The new driver will also be in the 2.6.29 kernel.