The external USB Superdrive from Apple requires a custom scsi command to be powered on. Can we add the following rule somewhere in the rulesets? SUBSYSTEMS=="usb", ACTION=="add", ATTRS{idVendor}=="05ac", ATTRS{idProduct}=="1500", KERNEL=="sr*", RUN+="/bin/sg_raw /dev/%k ea 00 00 00 00 00 01" As it cannot be solved with a simple usb storage quirk but would require a small driver, I think it makes sense to have this one liner in udev.
I'm really not sure that we should start shipping rules to enable specific storage devices, to initialize them, bring them up; it's usually the kernel's job to make sure that happens. I rather see essential things that are needed to make a device operational, or ensure proper operation during runtime, to happen inside the kernel and not in userspace. And things like resume from RAM needs to be handled too, how does the device behave there?
Hi Kay, resume works as the device only needs the SCSI command once when added. I understand your POV, so feel free to close this one out. I opened it here as a oneliner in userspace seems simpler and more managable than an in-kernel change/ums driver, but I tend to agree it's the job for the kernel. regards, Michele
I think it would be best to open a bug in the kernel bugzilla and heave it dealt with there. systemd is definitely not the place for device driver-like quirks.
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