| SteveM | Good morning, after 11 years I bought an another n900, got scammed as it was suppose to be fully working, only to find that the screen is kinda defective, I can calibrate the top scree 1 and 2 but no way I can calibrate the second bottom half 3 and 4, do you think I should replace the touch screen or a flash might save it... | 05:50 |
|---|---|---|
| sicelo | Sorry about that. You will have to replace the touch. Or, give up on N900 and get Droid 4 or pinephone | 08:37 |
| tmlind | uvos: is plain v5.15-rc1 booting for you with battery connected? i can boot my test device with no battery, but my phone fails to boot.. | 09:32 |
| tmlind | also my flakey pl2303 debug port is acting up, so not seeing phone debug output right now.. | 09:33 |
| tmlind | oh well need to continue debugging later | 09:35 |
| sixwheeledbeast | digitiser more than screen | 10:07 |
| sixwheeledbeast | flash is always worth it | 10:08 |
| Wizzup | I tried to replace a digitiser but it was quite hard :) | 12:31 |
| sixwheeledbeast | possibly the digitizer flex/connector or main flex/connector? if you rule out the software your left with a hardware fault. | 12:35 |
| uvos | tmlind: no i generaly dont try new kernel versions on d4 until i rebase my stuff off your branch as i treat you as my upstream | 16:27 |
| uvos | tmlind: but if your having issues with your usb-ttl i can capture the output for you later | 16:27 |
| uvos | parazyd: what about acitvating charge-mode for mapphones? | 17:43 |
| uvos | we should do this at some point.. | 17:43 |
| uvos | charge mode now also works fine on n900 | 18:24 |
| Wizzup | neat | 18:24 |
| uvos | should work fine on pp too anyhow | 18:25 |
| uvos | but cant test obv | 18:25 |
| lel | IMbackK synchronize a pull request: https://github.com/maemo-leste/leste-config/pull/25 (add quirks-mapphone to mapphone mce config) | 18:28 |
| lel | IMbackK synchronize a pull request: https://github.com/maemo-leste/leste-config/pull/25 (add quirks-mapphone to mapphone mce config) | 18:29 |
| lel | IMbackK edited a pull request: https://github.com/maemo-leste/leste-config/pull/25 (Various leste-config changes) | 18:29 |
| lel | IMbackK edited a pull request: https://github.com/maemo-leste/leste-config/pull/25 (Various leste-config changes) | 18:30 |
| uvos | ^^^ this is also needed for charge-mode on n900 | 18:30 |
| uvos | and the cmdline change same as mapphones ofc | 18:31 |
| lel | IMbackK synchronize a pull request: https://github.com/maemo-leste/leste-config/pull/25 (Various leste-config changes) | 18:58 |
| sicelo | uvos: critical voltage for N900 shall be below 3248mV, otherwise the device will never calibrate. iirc, 3198 is a good value. | 21:37 |
| uvos | sicelo: upower/mce take very long to realise that the voltage has dropped so idk if 3.198 is early enough to have it make it | 21:47 |
| uvos | sicelo: the same problem exits on mapphones too | 21:47 |
| uvos | we maybe need some sort of callibration mode | 21:47 |
| uvos | 3198 also seams like quite a random value | 21:48 |
| uvos | where is that comeing from? | 21:48 |
| uvos | really 3.2 ish volts is bad if you keep it up | 21:50 |
| uvos | https://www.dnkpower.com/wp-content/uploads/2019/01/discharging-curve-lipo-battery.png | 21:50 |
| uvos | see the discarge curve of a lipo, there is no power below 3.3 | 21:51 |
| uvos | cycle life wise it drops off conciderably below 3.3v too | 21:51 |
| sicelo | the thing is - 3248 is burned into the EPROM of bq27200 | 22:02 |
| uvos | yeah sure | 22:03 |
| uvos | but why 3.198? | 22:03 |
| uvos | that seams random | 22:03 |
| sicelo | lol | 22:03 |
| uvos | is it x adc steps? | 22:03 |
| sicelo | anyway, the voltage must be below 3248 for around 15s, iirc | 22:03 |
| uvos | lol? | 22:03 |
| sicelo | 3198 is what nokia had in bme. | 22:05 |
| sicelo | just make it whatever you like really. but if it's higher than 3248, your users will not be able to calibrate their batteries. | 22:06 |
| sicelo | the Li-ion batteries in the Nokias seem to perform alright with these low voltages ... at least I don't recall issues about premature battery wear mentioned anywhere on tmo. i know Li-Po and Li-ion are similar in many ways though | 22:08 |
| uvos | well li-po = li-ion | 22:10 |
| uvos | lipo is just a type of liion | 22:10 |
| uvos | anyhow yeah some solution is needed | 22:10 |
| uvos | ill lower the voltage for now | 22:10 |
| uvos | but i would be more comfortable with a 3.3v and a special charge mode maybe | 22:11 |
| uvos | the battery in n900 is lipo no? | 22:11 |
| uvos | sure feals like one | 22:11 |
| uvos | but have not dissasembled | 22:11 |
| sicelo | it's Li-ion | 22:11 |
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