Re: group is not set properly for usb printer for older kernels

[Evangelos Foutras <foutrelis@gmail.com>]

Matthias Schwarzott wrote:
> On Donnerstag, 15. Oktober 2009, Evangelos Foutras wrote:
>   
>> Kay Sievers wrote:
>>     
>>> On Tue, Oct 13, 2009 at 05:30, Evangelos Foutras <foutrelis@gmail.com> 
>>>       
> wrote:
>   
>>>> I set udev's loglevel to "debug" and saw something interesting in my
>>>> logs [1] after turning on the printer. Specifically, the following line
>>>> appears to be of interest:
>>>>
>>>>  Oct 12 19:38:26 foutboxd udevd-work[7541]: '/lib/udev/usb_id' (stderr)
>>>> 'error opening USB device 'descriptors' file'
>>>>
>>>> Maybe the 'descriptors' file hasn't been created when the udev rules
>>>> fire? I think this would explain why subsequent calls to udevadm
>>>> test/trigger apply the correct group to the printer.
>>>>         
>>> Yes, that might be. There have been numerous fixes to recent kernel
>>> versions to address issues like this. You could try to set up rules
>>> with WAIT_FOR_SYSFS="..." to possibly work around that on older kernel
>>> versions.
>>>       
>> I tried your suggestion and placing WAIT_FOR_SYSFS="descriptors" before
>> the IMPORT does produce the desired behavior (awesome!). If it's not
>> clear, I'm referring to line 69 in 50-udev-default.rules [1].
>>
>> Any chance of applying this modification to udev.git? :)
>>
>>     
> So adding this rule anywhere before line 69 will help?
> SUBSYSTEM="usb", ENV{DEVTYPE}="usb_device", WAIT_FOR_SYSFS="descriptors"
>
> If yes, I am going to add it to the gentoo ruleset.
>
> Regards
> Matthias
>   

That works too.