Hotplug not hotplugging.

Sam Varshavchik mrsam at courier-mta.com
Sun Nov 14 15:26:10 UTC 2004


James McKenzie writes:

> Sam Varshavchik wrote:
> 
>> I just got around with playing with the USB ports on my generic laptop 
>> from LAC that's running FC2+kernel 2.6.8-1.521
>>
>> If I have my camera plugged in when FC2 boots, I can open and use the 
>> camera just fine.  lsusb sees a Sony camera.  When I pull it out, 
>> usb-storage gets properly deregistered, as it should.
>>
>> If I plug the camera in after the kernel boots, nothing happens.  
>> Zilch. No kernel messages, nothing whatsoever.  The camera does see 
>> the cable connection, and flips over to USB mode as soon as the 
>> cable's connected, but nothing happens on the Linux side.  lsusb shows 
>> nothing.  I see nothing happening in /proc/bus/usb.  When I reboot, 
>> the camera is accessible again.
>>
>> Where do I need to look?
>>
>>
> Sam:
> 
> What does dmesg say when you plug and unplug the camera?

Absolutely nothing.

This is definitely a kernel bug in 2.6.8.  If I boot the 2.6.6-1.435.2.3 
kernel errata for FC2, hotplugging begins to work again.  For some reason 
SCSI emulation gets initializes as /dev/sdb, instead of /dev/sda, though.  
No clue why /dev/sda is already taken.


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