Date: Mon, 12 Apr 2004 22:34:13 -0400 From: Jesse Sheidlower <jester@panix.com> To: freebsd-questions@freebsd.org Subject: USB via module instead of kernel? Message-ID: <20040413023413.GA2071@panix.com>
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I'm new to this kernel-module thing, so I hope this isn't a silly question. I'm using FreeBSD 5.2 on a laptop running ACPI, and like many others have had suspend/resume problems with the USB dying on resume. I saw a suggestion somewhere that you could remove USB support from the kernel, and add it in via a .ko file at boot time; this way, you could have an rc.suspend and rc.resume that unloads/loads the USB module appropriately and perhaps avoid the problems. I'm not entirely sure how to do this. First, I note that the "device usb" line in the kernel configuration file has a "Required" note in it, and I'm nervous about removing something that says "Required". Second, while I have a usb.ko file under /boot/kernel/, if I type "kldload usb", I get a "can't load usb: File exists" message, but if I try "kldunload usb", I get "can't find file usb: No such file or directory". I might have expected a different message if usb is loaded as part of the kernel. If I want to enable it at boot, do I just add "usb_load="YES"" to /boot/loader.conf ? So to summarize, I guess my questions are: 1) Can I comment out "device usb" from my kernel config and then rebuild the kernel, without causing some big problem? 2) To load at boot, do I just add "usb_load="YES"" to /boot/loader.conf ? 3) Will doing what I described help with the USB problems on suspend/resume? Thanks very much. Jesse Sheidlower
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