Linux Troubleshooting

Linux Troubleshooting

Use the dmesg command to check for driver diagnostic messages.

When doing modprobe of a Sensoray driver module, the following messages may appear: "<modulename>: disagrees about version of symbol <symbolname>"

This may be due to a mismatch of vermagic between the currently running kernel and the config file used to build the driver module. Compare the vermagic field using the modinfo command between the Sensoray driver module name and the modinfo videobuf_vmalloc from the running kernel. A common cause for this discrepancy is when the operating system upgrades the Linux kernel during automatic software updates.

To correct the issue, copy the currently running config to the kernel source directory and rebuild the driver module.

Backup the original config file:

 (cd /lib/modules/`uname -r`/build; sudo mv .config .config.save)

Copy the current running config:

 sudo cp /boot/config-`uname -r` /lib/modules/`uname -r`/build/.config

If "/boot/config-`uname -r`" doesn't exist on your system, the config may also be copied from one of the following locations:

 zcat /proc/config.gz | sudo tee /lib/modules/`uname -r`/build/.config
 sudo cp /proc/config /lib/modules/`uname -r`/build/.config

After doing the above, rebuild and try to re-install the Sensoray driver module.