Monday, May 29, 2017

Upgrading Nubia 7 mini

I recently bought this  phone on marktplaats, already upgraded to Mokee Android 7. I liked the features, my previous phone used Android 4.2.
So I bought another one for my wife, this time I had to make the upgrade myself. It was not straightforward:

The first nubia used as recovery  TWRP 3.0.2-0, the other is with clockwork-mod (v6.0.5.0).
  • I had to resize the big "grow" partition manually, i.e. merge it with "userdata".
  • suddenly I saw disconnections of Wifi, and that was due to the same MAC address of the 2 nubias.

MAC address

So I searched for a solution to tune the MAC address. I found the hint on Intf0MacAddress in WCNSS_qcom_cfg.ini. But it did not work.
/data/misc/wifi/WCNSS_qcom_cfg.ini  nor  /system/etc/wifi/WCNSS_qcom_cfg.ini
So I had a workaround to
echo 98:6c:f5:63:ec:d0 > /sys/devices/fb000000.qcom,wcnss-wlan/wcnss_mac_addr
while in airplane mode.
In the end I  found /persist/WCNSS_qcom_cfg.ini which indeed works, and overrides the other 2 files.

ANDROID_SERIAL to distinguish them?

To have them accessible via adb at the same time, I need to distinguish by this serial number, which is unfortunately identical. For now I overwrite the kernel cmdline in img_info with "androidboot.serialno=XXX"

Proximity sensor

After receiving some (whatsapp) calls, I noticed it was almost impossible to get the screen back on, as expected.

So, as a workaround I turned off  in Phone> Settings> Accessibility> Use proximity sensor.
But Whatsapp does not seem to have this option.

So I installed Sensors test and some app to "reset/calibrate" but to no effect.

So I started to look for the kernel driver, to fix a possible bug. There are confusingly multiple kernel sources on github:
Btw. failures of the other kernels can be seen thanks to android ram-console: after the failure, the phone reboots to recovery and 
adb shell cat /proc/last_kmsg
shows the problem.

In the end the problems is only the calibration, so 
 echo 500 > prox_threshold_low  
fixes the issue. To see this value, I did:
cd /sys/class/proximity/proximity/
echo 1 > prox_debug
and "dmesg -c" while running the sensor test app, to see:

[43580.286869] [SENSOR_ALS_PROX] [taos_prox_threshold_set: 2338] proxdata = 396
I guess it's stored in /persist/proxdata/threshold ?

Other issues

calendar/alarm database -- crash when entering the Alarm app:

android.database.sqlite.SQLiteException: Can't downgrade database from version 12 to 8

I removed the relevant file.

SystemUI crash due to wallpaper using too big image

java.lang.RuntimeException: Canvas: trying to draw too large(143769600bytes) bitmap.
AppCrashReceiver: stopped unexpectedly...

rm  /data/system/user/0/wallpaper_*

My improvements (divided into feature-segments)

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