lorthirk | # 1 | 2009-11-26, 12:33 | Report

Hello all. I received my N900 on monday, but yesterday i discovered an issue with headphones.

- Using Nokia Headphones (WH-205) on N900, the phone simply doesn't recognize them.
- Using iPhone headphones on N900, I can hear phones sound but with really heavy and noisy distortion.
- Using a standard headphone on N900, it works ok.
- Using Nokia Headphones (WH-205) on iPhone, it works ok. --- NOT VALID ANYMORE, SEE POST #3
- Using Nokia A/V cable on N900, it works ok.

So... what are your suggestion? I really can't find who's to blame...

---

Last edited by lorthirk; 2009-11-26 at 19:30.

charlie | # 2 | 2009-11-26, 18:35 | Report

Nokia's 4-pole jack is wired up differently to the iPhone's - the ground and mic connections are reversed. For details see:

• Nokia connector details
• iPhone connector details

Hope this explains at least one of your issues.

lorthirk | # 3 | 2009-11-26, 19:08 | Report

Yes, this is perfectly reasonable.

However i'd like to add a detail:

If I plug in the Nokia headphones and then execute a dmesg, I can see:

headphone (GPIO 177) is now connected.

So the kernel does recognize them as headphones. Since i'm new to the maemo platform is there some other diagnostic I can do?

Ok, I have another news...
I really can't figure out why, but it seems that Nokia headphones doesn't work so well on iPhone or other devices, too. I hear a somewhat distant sound. So... maybe we have a winner?

---

Last edited by lorthirk; 2009-11-26 at 19:29.

charlie | # 4 | 2009-11-26, 19:58 | Report

Can't help here - my pre-order hasn't arrived yet!

It's the same issue as using the iPhone headphones on the N900 - the mic and ground lines are reversed in the headphone jack with repect to the device socket.

lorthirk | # 5 | 2009-11-27, 17:20 | Report

Ok, some little news. Today I tried a N95 headset with my N900 and vice-versa. Both headset were working flawlessly with the "non-respective" device (except for the "headset" icon on N900 -- to get i have to plug in the headset and then turn on the device; a further unplug & replug doesn't make the icon come back), with working headphones AND microphone. Could it be a software issue, at this point?

lorthirk | # 6 | 2009-11-28, 17:16 | Report

Can anyone please tell me how to monitor system for headset plugging/unplugging, and how they're recognized, apart from dmesg?

Abemelek | # 7 | 2009-11-28, 17:25 | Report

so my bose in ear mobile headset won't work with the n900

lorthirk | # 8 | 2009-11-28, 17:47 | Report

i'm sorry, is this a question or a sentence?

Abemelek | # 9 | 2009-11-28, 20:18 | Report

sorry it's a question.
since the bose in ear mobile headset works with the iphone, and the iphone headphones don't work with the n900, i figured it wouldn't work.
can you use the iphone headphones as a normal 3.5mm ear phone just for music at least.
i really really really love my bose ear phones

---

Last edited by Abemelek; 2009-11-28 at 20:26.

lorthirk | # 10 | 2009-11-28, 20:34 | Report

if it's a simple headphone with no microphone it will work. problems are with headsets (headphones+microphone).