maemo.org - Talk - View Single Post - N900 Cant access the modem.

Dimand	2011-09-19 , 08:07
Posts: 18 \| Thanked: 2 times \| Joined on Aug 2010	#1

There are many other threads on this topic. Most of them are under the name of sim card failed etc where the user is experiencing a lack of cellular connectivity and a sim card with a bar through it. Sometimes this is just a problem with the sim card, in this case, the sim card is fine.

Here is some background on the bug:
https://bugs.maemo.org/show_bug.cgi?id=10307

Now i'm here to discuss this and hopefuly find a solution. I am fairly tech savy so lets hope i can easily do anything that people suggest. I am also determined to fix my N900.

This MAY be a hardware problem. It does seem to happen more in warmer situations. however, I have had my phone to pieces and all connections are good and heatsinks are clear and free of fluff. Here is a good quote from the bugtracking thread as to why i believe this is a software issue:

Yes, this could be an HW issue but:

1) many ppl are experiencing the very same issue. that's strange. That would mean that a certain amount of N900 have been shiped wot faulty hahdware. Bad.

Here is Maemo Talk thread
http://talk.maemo.org/showthread.php...ight=sim+error

2) the modem is working perfectly while on 2G and once a 3G connection is established error won't happen. If that was a faulty HW issue I'd assume resets would still happen while connected.

3) I already reflashed both with 1.1 and 1.2. Issues are VERY less frequent on 1.2. Again, if that was a HW issue, problems would have been still there.

4) Modem resets are more frequent while on some spefic cell towers. If that was a HW issue, resets shouldn't be related to network location.

Now, I have system logs that show the events that occur.
If i am on a call and start using other applications i get disconnected, however the modem reconnects very soon after.

Code:

Sep 19 09:16:09 Nokia-N900 kernel: [ 2040.272857] ******
Sep 19 09:16:09 Nokia-N900 kernel: [ 2040.272857] * CMT rst line change detected (0)
Sep 19 09:16:09 Nokia-N900 kernel: [ 2040.272888] *****
Sep 19 09:16:09 Nokia-N900 kernel: [ 2040.272949] McSAAB: ACWake line 00000002
Sep 19 09:16:09 Nokia-N900 kernel: [ 2040.272979] McSAAB: CAWake line 0
Sep 19 09:16:09 Nokia-N900 kernel: [ 2040.272979] McSAAB: Main state: 2
Sep 19 09:16:09 Nokia-N900 kernel: [ 2040.273010] McSAAB: RX state:00
Sep 19 09:16:09 Nokia-N900 kernel: [ 2040.273040] McSAAB: TX state:02
Sep 19 09:16:09 Nokia-N900 kernel: [ 2040.273040] McSAAB: CMT was ONLINE
Sep 19 09:16:09 Nokia-N900 kernel: [ 2040.273071] McSAAB: FLAGS: 0003
Sep 19 09:16:09 Nokia-N900 kernel: [ 2040.273101] McSAAB: Last RX control msg 400003FB
Sep 19 09:16:09 Nokia-N900 kernel: [ 2040.273132] McSAAB: Last TX control msg 50000000
Sep 19 09:16:09 Nokia-N900 kernel: [ 2040.273162] McSAAB: TX C queue head 3 tail 3
Sep 19 09:16:09 Nokia-N900 kernel: [ 2040.273162] McSAAB: Data RX ID: 252
Sep 19 09:16:09 Nokia-N900 kernel: [ 2040.273193] McSAAB: Data TX ID: 76
Sep 19 09:16:09 Nokia-N900 kernel: [ 2040.273223] McSAAB: TX queue len: 0
Sep 19 09:16:09 Nokia-N900 kernel: [ 2040.273223] McSAAB: RX queue len: 0
Sep 19 09:16:10 Nokia-N900 kernel: [ 2040.665039] McSAAB: ACWAKE DOWN
Sep 19 09:16:10 Nokia-N900 kernel: [ 2040.665130] McSAAB: ACWAKE UP
Sep 19 09:16:10 Nokia-N900 kernel: [ 2040.665222] McSAAB: WAKELINES TEST OK

However, say the phone is in my pocket. sometimes the modem will start cycling disconnects and then disable the modem giving the characteristic, all telephone functions disabled and bard sim card message.

Code:

Sep 19 11:54:42 Nokia-N900 kernel: [ 7655.858032] ******
Sep 19 11:54:42 Nokia-N900 kernel: [ 7655.858062] * CMT rst line change detected (0)
Sep 19 11:54:42 Nokia-N900 kernel: [ 7655.858062] *****
Sep 19 11:54:42 Nokia-N900 kernel: [ 7655.858337] McSAAB: ACWake line 00000000
Sep 19 11:54:42 Nokia-N900 kernel: [ 7655.858367] McSAAB: CAWake line 0
Sep 19 11:54:42 Nokia-N900 kernel: [ 7655.858367] McSAAB: Main state: 2
Sep 19 11:54:42 Nokia-N900 kernel: [ 7655.858398] McSAAB: RX state:00
Sep 19 11:54:42 Nokia-N900 kernel: [ 7655.858428] McSAAB: TX state:00
Sep 19 11:54:42 Nokia-N900 kernel: [ 7655.858459] McSAAB: CMT was ONLINE
Sep 19 11:54:42 Nokia-N900 kernel: [ 7655.858459] McSAAB: FLAGS: 0001
Sep 19 11:54:42 Nokia-N900 kernel: [ 7655.858489] McSAAB: Last RX control msg 00000000
Sep 19 11:54:42 Nokia-N900 kernel: [ 7655.858520] McSAAB: Last TX control msg 50000000
Sep 19 11:54:42 Nokia-N900 kernel: [ 7655.858551] McSAAB: TX C queue head 0 tail 0
Sep 19 11:54:42 Nokia-N900 kernel: [ 7655.858551] McSAAB: Data RX ID: 81
Sep 19 11:54:42 Nokia-N900 kernel: [ 7655.858581] McSAAB: Data TX ID: 65
Sep 19 11:54:42 Nokia-N900 kernel: [ 7655.858612] McSAAB: TX queue len: 0
Sep 19 11:54:42 Nokia-N900 kernel: [ 7655.858642] McSAAB: RX queue len: 0
Sep 19 11:54:42 Nokia-N900 cellular: ssc[767]: SSI connection DOWN
Sep 19 11:54:42 Nokia-N900 cellular: ssc[767]: Unexpected modem reset, waiting for modem reboot
Sep 19 11:54:42 Nokia-N900 cellular: ssc[767]: Starting cmt restart timeout
Sep 19 11:54:42 Nokia-N900 cellular: csd[803]: com.nokia.csd.GPRS: Phonet down - resetting
Sep 19 11:54:42 Nokia-N900 cellular: csd[803]: com.nokia.phone.net: net_phonet_link_status: link DOWN
Sep 19 11:54:42 Nokia-N900 cellular: csd[803]: com.nokia.phone.SIM: phonebook_phonet_link_status: link DOWN
Sep 19 11:54:42 Nokia-N900 cellular: csd[803]: com.nokia.phone.net: net_read_oper_name_req completed: PHONE_MESSAGE_SEND_FAIL
Sep 19 11:54:42 Nokia-N900 bluetoothd[951]: get_operator_name failed with code 2
Sep 19 11:54:47 Nokia-N900 cellular: ssc[767]: Cold starting cmt
Sep 19 11:54:47 Nokia-N900 kernel: [ 7660.943145] McSAAB: ACWAKE DOWN
Sep 19 11:54:48 Nokia-N900 kernel: [ 7662.068176] McSAAB: ACWAKE UP
Sep 19 11:54:52 Nokia-N900 cellular: ssc[767]: modem connection cannot be established, retry (1 of 10)
Sep 19 11:54:52 Nokia-N900 kernel: [ 7665.979309] McSAAB: ACWAKE DOWN
Sep 19 11:54:53 Nokia-N900 kernel: [ 7667.216369] McSAAB: ACWake line 00000000
Sep 19 11:54:53 Nokia-N900 kernel: [ 7667.216430] McSAAB: CAWake line 0
Sep 19 11:54:53 Nokia-N900 kernel: [ 7667.216461] McSAAB: Main state: 1
Sep 19 11:54:53 Nokia-N900 kernel: [ 7667.216491] McSAAB: RX state:00
Sep 19 11:54:53 Nokia-N900 kernel: [ 7667.216491] McSAAB: TX state:00
Sep 19 11:54:53 Nokia-N900 kernel: [ 7667.216522] McSAAB: CMT was OFFLINE
Sep 19 11:54:53 Nokia-N900 kernel: [ 7667.216552] McSAAB: FLAGS: 0006
Sep 19 11:54:53 Nokia-N900 kernel: [ 7667.216583] McSAAB: Last RX control msg 10000001
Sep 19 11:54:53 Nokia-N900 kernel: [ 7667.216613] McSAAB: Last TX control msg 20000001
Sep 19 11:54:53 Nokia-N900 kernel: [ 7667.216613] McSAAB: TX C queue head 2 tail 2
Sep 19 11:54:53 Nokia-N900 kernel: [ 7667.216644] McSAAB: Data RX ID: 0
Sep 19 11:54:53 Nokia-N900 kernel: [ 7667.216674] McSAAB: Data TX ID: 0
Sep 19 11:54:53 Nokia-N900 kernel: [ 7667.216705] McSAAB: TX queue len: 0
Sep 19 11:54:53 Nokia-N900 kernel: [ 7667.216705] McSAAB: RX queue len: 0
Sep 19 11:54:57 Nokia-N900 cellular: ssc[767]: modem connection cannot be established, retry (2 of 10)
Sep 19 11:55:02 Nokia-N900 cellular: ssc[767]: modem connection cannot be established, retry (3 of 10)
Sep 19 11:55:07 Nokia-N900 cellular: ssc[767]: modem connection cannot be established, retry (4 of 10)
Sep 19 11:55:12 Nokia-N900 cellular: ssc[767]: modem connection cannot be established, retry (5 of 10)
Sep 19 11:55:17 Nokia-N900 cellular: ssc[767]: modem connection cannot be established, retry (6 of 10)
Sep 19 11:55:22 Nokia-N900 cellular: ssc[767]: modem connection cannot be established, retry (7 of 10)
Sep 19 11:55:27 Nokia-N900 cellular: ssc[767]: modem connection cannot be established, retry (8 of 10)
Sep 19 11:55:32 Nokia-N900 cellular: ssc[767]: modem connection cannot be established, retry (9 of 10)
Sep 19 11:55:37 Nokia-N900 cellular: ssc[767]: modem connection cannot be established, retry (10 of 10)
Sep 19 11:55:42 Nokia-N900 cellular: ssc[767]: modem connection cannot be established, giving up
Sep 19 12:07:18 Nokia-N900 -- MARK --

This phone was re flashed only a week ago. made little to no difference. The problem appeared gradually. the symptoms are very similar to others.

I will upload a full log dump when I get home.

Please respond to my cry for help!

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