# Altitude control - Loosing controls **URL:** \ **Category:** Flight Testing & Log Analysis\ **Created:** [January 21, 2017, 6:35am UTC](https://discuss.px4.io/t/altitude-control-loosing-controls/2238 "2017-01-21T06:35:45Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![Sn0west](https://discuss.px4.io/user_avatar/discuss.px4.io/sn0west/32/102_2.png) [@Sn0west](https://discuss.px4.io/u/Sn0west)\ **Post date:** [January 21, 2017, 6:35am UTC](https://discuss.px4.io/t/altitude-control-loosing-controls/2238/1 "2017-01-21T06:35:45Z")
Hi everyone, I just flashed the latest stable px4 firmware 1.5.4 to my AUAV-X2. Stabilized seems to be okay but if I switch to altitude control I loose controls. Throttle Stick is at mid position when switching to altitude control and the copter shoot up in the air, lowering the stick to zero doesn’t help and the copter is not descending. It is not controllable at all with standard setting. What do I need to do to get it work. Is it a flight controller problem? I have an exact same frame with a pixracer 1.5.3 and it seems to work perfectly fine there. ---
**Author:** ![LorenzMeier](https://discuss.px4.io/user_avatar/discuss.px4.io/lorenzmeier/32/17_2.png) [@LorenzMeier](https://discuss.px4.io/u/LorenzMeier)\ **Post date:** [January 21, 2017, 7:24am UTC](https://discuss.px4.io/t/altitude-control-loosing-controls/2238/2 "2017-01-21T07:24:55Z")
Hi, Hard to tell without a log. 1.5.3 and 1.5.4 are the same version with just the tag renamed. Are you using master by chance on one of them? What we changed on master is that the hover throttle param is now relevant and you need to set it for optimal performance. It should not shoot up uncontrollably though. -Lorenz ---
**Author:** ![Sn0west](https://discuss.px4.io/user_avatar/discuss.px4.io/sn0west/32/102_2.png) [@Sn0west](https://discuss.px4.io/u/Sn0west)\ **Post date:** [January 21, 2017, 9:51pm UTC](https://discuss.px4.io/t/altitude-control-loosing-controls/2238/3 "2017-01-21T21:51:09Z")
I would love to give some logs, but it doesn’t write it. I just flashed ac 3.4.4 from QGroundControl and there was no problems writing logs. After flashing px4 1.4.4 Master it did not write any logs. Why? I need some more altitude tests to give some more details. I couldn’t switchto a gps flight mode, why? Only whene The copter was not armed, then I could change the flightmode. In Ac and Px4. Strange! ---
**Author:** ![Sn0west](https://discuss.px4.io/user_avatar/discuss.px4.io/sn0west/32/102_2.png) [@Sn0west](https://discuss.px4.io/u/Sn0west)\ **Post date:** [January 22, 2017, 3:23pm UTC](https://discuss.px4.io/t/altitude-control-loosing-controls/2238/4 "2017-01-22T15:23:36Z")
is it possible that px4 1.4.4 ist not writing logs on auav-x2? ---
**Author:** ![LorenzMeier](https://discuss.px4.io/user_avatar/discuss.px4.io/lorenzmeier/32/17_2.png) [@LorenzMeier](https://discuss.px4.io/u/LorenzMeier)\ **Post date:** [January 22, 2017, 3:53pm UTC](https://discuss.px4.io/t/altitude-control-loosing-controls/2238/5 "2017-01-22T15:53:31Z")
@PKocmoud Can you validate that? Note that we’re not actively supporting 1.4.4 any more - do you mean 1.5.4? ---
**Author:** ![PKocmoud](https://discuss.px4.io/user_avatar/discuss.px4.io/pkocmoud/32/43_2.png) [@PKocmoud](https://discuss.px4.io/u/PKocmoud)\ **Post date:** [January 22, 2017, 4:24pm UTC](https://discuss.px4.io/t/altitude-control-loosing-controls/2238/6 "2017-01-22T16:24:54Z")
Hi @Lorenz, The X2 uses the same firmware as the FMUv2. I cannot load 1.4.4 without actually building it. But for the sake of confirmation, I have loaded Master (1.5.2dev) on an X2 and logging works fine. I don’t have it mounted to an aircraft so I cannot actually fly it. But if you have no complaints from other Pixhawk (FMUv2) users then I would suspect a local issue. Maybe load a current version of the firnware? Maybe defective hardware? ---
**Author:** ![Sn0west](https://discuss.px4.io/user_avatar/discuss.px4.io/sn0west/32/102_2.png) [@Sn0west](https://discuss.px4.io/u/Sn0west)\ **Post date:** [January 22, 2017, 6:24pm UTC](https://discuss.px4.io/t/altitude-control-loosing-controls/2238/7 "2017-01-22T18:24:06Z")
Logging used to work fine with arducopter and actually with px4 as well. I was surprised that it did not work. I will flash the latest master and write some feedback. This will be netxt weekend. ---
**Author:** ![Andreas\_Hoffmann](https://discuss.px4.io/user_avatar/discuss.px4.io/andreas_hoffmann/32/3467_2.png) [@Andreas\_Hoffmann](https://discuss.px4.io/u/Andreas_Hoffmann)\ **Post date:** [January 23, 2017, 2:13pm UTC](https://discuss.px4.io/t/altitude-control-loosing-controls/2238/8 "2017-01-23T14:13:33Z")
I’m using AUAV-X2 with PX4 since 1.2 and I have never experienced any Problem with Log File generation. ---
**Author:** ![Barry\_Bolton](https://discuss.px4.io/user_avatar/discuss.px4.io/barry_bolton/32/5602_2.png) [@Barry\_Bolton](https://discuss.px4.io/u/Barry_Bolton)\ **Post date:** [January 24, 2017, 10:48am UTC](https://discuss.px4.io/t/altitude-control-loosing-controls/2238/9 "2017-01-24T10:48:04Z")
How did you mount your controller On peace of foam or a proper vibration dampner ---
**Author:** ![Sn0west](https://discuss.px4.io/user_avatar/discuss.px4.io/sn0west/32/102_2.png) [@Sn0west](https://discuss.px4.io/u/Sn0west)\ **Post date:** [January 24, 2017, 8:54pm UTC](https://discuss.px4.io/t/altitude-control-loosing-controls/2238/10 "2017-01-24T20:54:08Z")
no I never do vibration damper, it is not necessery. Not one of my race quad are damped and they fly like a charm with betaflight. The software has to fix it 🙂 ---
**Author:** ![cctsao1008](https://discuss.px4.io/user_avatar/discuss.px4.io/cctsao1008/32/3573_2.png) [@cctsao1008](https://discuss.px4.io/u/cctsao1008)\ **Post date:** [March 10, 2017, 2:46pm UTC](https://discuss.px4.io/t/altitude-control-loosing-controls/2238/11 "2017-03-10T14:46:43Z")
I have meet the same problem, ---
**Author:** ![Junaid](https://discuss.px4.io/letter_avatar_proxy/v4/letter/j/a9adbd/32.png) [@Junaid](https://discuss.px4.io/u/Junaid)\ **Post date:** [April 2, 2019, 8:09am UTC](https://discuss.px4.io/t/altitude-control-loosing-controls/2238/12 "2019-04-02T08:09:25Z")
@Sn0west @cctsao1008 Did you guys manage to solve the issue? I am facing the same issue on a Helicopter build. Once I switch to altitude mode it either shoots up at maximum speed or crazy roll values and causes a crash.