On 06/28/2012 09:25 PM, stef wrote: > Le 28/06/2012 13:59, Jay Christnach a ?crit : >>> Hello, >>> >>> thanks for all these data. I have uploaded at >>> http://dl.free.fr/gEzUYJkHX a small 'gl124' unit test program. It >>> does an uncorrected color scan at 150 dpi. It is a fully static 32 >>> binary using libusb-1.0.9 . Put it in a directory, copy your >>> genesys.conf file in the same directory then run it. You should see >>> the lamp switch on. I'm curious to know how it behaves in the >>> "buggy" hardware combination. >>> >>> Regards, >>> Stef > OK, > > now here's the same test program compiled against legacy libusb > 0.1 (and not through the compat libusb-1.0). If it still doesn't light > on the lamp, I think we can rule out a libusb problem: > > http://dl.free.fr/rm.pl?h=reyVJTLYp&i=48660014&s=XdEvMMX5NTGQlxGZp3zmhq6vZSkoY4FE > > > > > Regards, > Stef > > Hello again,
I have some news: The problem is intermittent! Sometimes after rebooting it works again, but then eventually fails again. (These days I'm refoaming loudspeakers in my lab and I use a big power amp to test with a 2 Hz signal if the cone is centered. The amp sometimes triggers the circuit breaker while switching on, so that power is lost and I have to restart my computer. Usually I let it run all the time.) By chance I tested your statically linked test program again and found it worked this time! I already suspected that the problem would be intermittent, but I was not sure when and how. So be assured now, that there is no software problem. It is linked to the fact that I use some usb port to connect my smartphone. I did some testing when nothing but the scanner was connected and it didn't work. For the moment it works and I tried connecting the phone while scanning. The LEDs immediately went dark when I connected the plug. Unlugging it, it worked again. I now also observed a few scans where the light went dark in the middle of the scan without the phone being connected. I will try with different ports for my devices or maybe a powered hub and the problem should be solved. So Armin Stebich was right in that matter that it is a power over USB problem. So sorry for bothering you and many thanks for your help. I'm pretty convinced that this issue is now solved. Best greetings
