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I see however, the problem rather be the CGminer itself, because it deregulates the stick for wathever reasons
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'wathever reasons' is the problem.
Often as simple as a power source issue.
Hello Kano,
Thank you for your reply.
I've got a gekko usb hub with 120W PS and a fan running beside this miner. The power consumption of these can't be more than 5V/3A=15W + 5V/2,5A=12W, Sum: 27W, which is covered with the 120W PS abundandtly.
If I run two other miners + the fan there are no problems. They are running rock solid so the PS can't be a problem.
If I put this problematic miner in usb-port-pair with the others, it kicks the others out and they restarts automatically in about every 2-3 minutes.
If I run it beside them - not in a port-pair -, the two are running stable and this one is restarting with a reduced T until it gets to a point where the T is in the (-) minus range... Than it kicks the others out as well and they stop working.
I'm starting cgminer with the following line:
--gekko-compacf-freq 420 --gekko-start-freq 350 --gekko-mine2 --gekko-tune2 85
Now I lost nerves playing around with them days long without any success and let the 2 unproblematic without the other one running.
Added some simple troubleshooting steps at the bottom of the setup post.
May or may not be useful.
https://bitcointalksearch.org/topic/m.58200639Of course the miner itself 'can' be faulty, but these steps, somewhat related to what you've done, point out specific testing.
Also, since that's an odd number to use, I'll point out that "--gekko-tune2 85" simply means:
every 85 minutes, if it's not "--gekko-compacf-freq 420", check if it can go faster
Sorry for the late reply. Your troubleshooting and setup steps were the first I read, because I didn't want to mess something with the stick up and/or spam here. It was super useful and everyone should read it!!! In my opinion, there are some other very important "soft" variables one has to consider as a little amendment along your tutorial (if you have to make adjustments and the factory settings wouldn't be good enough)
This post might will be a little long, but it worth to read, if someone has adjustment issues like I did.I got some new miners and I started everything from scratch by observing the new and good-running ones. Than:
1) I unplugged all the miners and I took a look at the little "Vcore-button" of the new ones after doing an hour testrun with them, to see if their factory settings are ok. They were stable so I compared the Vcore settings of all these good miners. Most of them was almost set identically at 17 min.
1.1) I copied this Vcore setting (17 min) and started the problematic at this point but it didn't worked out. It kept crashing.
1.2) I set the Vcore as I mentioned in one of my earlier post at ca. 25 min. (example from the NewPac thread:
http://23.108.83.14/images/NewPac-0006.png).
2) Than I plugged the problematic stick in a usb tester in order to see the amperage.
3) I plugged the usb tester with the stick in the gekko hub and started CGminer with my erlier compac F settings. (+ Fan of course)
4) I let it ramp up and it stablized itself almost. I had to make a tiny adjustment turning the Vcore counterclockwise just 1-2 millimeters. But all this
very-very slowly. I saw the amperage slighlty decreasing but the stick got up from 94-95% to 100%.
5) I waited and observed the hashrate, amps etc. The hashrate gone up until the point it had reached earlier.
6) I waited and after 5-10 min the hashrate begun to climb further higher (instead of crashing) and stopped at a point. I'd say 3/4 way through compared to the others' at 420 MHz.
7) I've turned the Vcore slighlty observing closely the amps, the hashrate and WU-value. As I turned it in one way or the other the amps changed along with the other rates.
BUT it is very important that it took some time until I saw the stick's reaction. So turning just a 0,1 mm, yes, "0,1" mm in one direction and waiting 5-10 sec to see the reaction. If someone turns it like 2-3 mm or more at once you can forget it and won't work. You'll see the stick's reaction of course but you cannot fine-tune or adjust it but it can crash due to the quick change. It was my expreience at least. It is like jumping in a tub full of hot water. If you emerge yourself slowly, little by little it won't hurt, but jumping...
The same happens with the stick reducing or increasing the Vcore (Amps) like crazy - I reckon.
8.) I saw the hashrate climbing up almost until to the point (2-3 GHs less) where the others were running. With this maybe "rookie" method I managed to fine-tune my miner in 4 hours.
9) Along the road I've noticed that this stick got somehow hotter than the others and thus the cooling was an issue though. Hence I had this only stick to cool down I could point the airflow much centered at the heatsink and this solved the problem.
What have I learned?
1) Mark your factory Vcore setting before you want to make any changes.
2) Always start at the 25 min. mark (see point 1.2 above), if you turned the Vcore far away from its factory setting or you don't remember this one anyomore.
3) Be very-very-very patient and slow with the adjusment. (Only begin it if you have time and you're not in a rush.)
4) Do it with only one stick in a hub at once and use a usb tester.
5) Have a super airflow.You can find all these infos in one way or the other in the other posts before but I wanted to sum all those up here in one and stepwise. I hope it'll be helpful.
Using multiple sticks in one hub0) Before using a stick in a pool be sure it is running smoothly alone. If not please see above.
1) Start CGminer only with 2 sticks in a hub at once.
2) When they are runnig smoothly and are stable, plug in one more. If stable, one more and so on. Don't start with 6-7 sticks at once. Maybe all of your sticks' setup is fine but the "stronger", slightly more stable sticks can destabilize the weaker and vice versa. ...and you end up thinking there is something wrong with the stick even if there isn't.
3) In the meanwhile be assured they get enough air, what can cool them down enough. A fan from above spins in one direction and the last stick(s) in case of 5 or 6 may not gets enough air, gets hot and crashes, although there isn't any problem with its settings at all.
I rather try to find an explanation why is one behaving so weird. There's a solution for everything. And yes, this is lottery and has to be fun not a struggle.