There are 4 commands that are particularly helpful for troubleshooting driver problems:lsmod: list all modules that are installedmodprobe: install a specific driverrmmod: uninstall a driverlocate: find any file on the system containing a specific stringSo if I've got a 3Com 905c card, and I know that the correct driver for it is the 3c59x driver I might do this:1. Verify that it exists on the system:# locate 3c59x/lib/modules/2.6.12-1.1372_FC3/kernel/drivers/net/3c59x.ko/lib/modules/2.6.10-1.770_FC3smp/kernel/drivers/net/3c59x.ko/lib/modules/2.6.12-1.1372_FC3smp/kernel/drivers/net/3c59x.ko/lib/modules/2.6.12-1.1378_FC3/kernel/drivers/net/3c59x.ko/lib/modules/2.6.10-1.770_FC3/kernel/drivers/net/3c59x.ko2. OK, it exists. Now I'll check to see if it's loaded:# lsmod | grep 3c59x3. No response means it's not loaded so I'll load it with modprobe:# modprobe 3c59x4. Now lsmod will show that it is installed:# lsmod | grep 3c59x3c59x 44905 0 mii 9537 1 3c59x5. If I want to uninstall it I can use rmmod:# rmmod 3c59x
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