Dead digitizer (only when OS fully turned ON)

@Naecken: "When phone display turns off, the notification LED quickly blinks double time with turquoise color" is most likely: Powering down display is taking longer than expected (ref: https://git.merproject.org/mer-core/mce/blob/master/inifiles/debug-led.ini#L39).

Is there anything interesting looking in journal around display power down / up?

spiiroin: Nice reference, thanks for reaction :)

Well, I didn't saw anything special or unexpected. Video attached Is there any possibility to get other error feedback from system? LED blinking at 1:50.

@Naecken: As the freezes happen in middle of already ongoing interaction... primary candidates that come to my mind are:

• the touch events stop flowing somewhere along the hw->fw->kernel->lipstick line
• lipstick itself gets stuck for some reason

The latter seems unlikely because there is a long power key press shutdown in the video and it manages to produce shutdown logo (i.e. power button -> power key event -> mce -> shutdown request -> dsme -> shutdown indication -> lipstick -> switch graphics to shutdown logo -chain is working as expected).

Also the cyan panic led points to kernel problems (if lipstick were stuck there would be green/red blinking), so I'm wondering if the driver needs to do retries / otherwise fails to communicate with the touch panel i.e. are the still issues with the contacts / flex?

You can debug the touch even flow for example by running evdev_trace (from mce-tools package), something like:

ssh nemo@<ip-addr>
devel-su
evdev_trace -it 0 # 0 due to Jolla1 having touch input device at /dev/input/event0

Then you should get constant flow of things like below when holding finger on screen:

/dev/input/event0: 17893.959 - 0x03/EV_ABS - 0x035/ABS_MT_POSITION_X - 783
/dev/input/event0: 17893.959 - 0x03/EV_ABS - 0x036/ABS_MT_POSITION_Y - 587
/dev/input/event0: 17893.959 - 0x03/EV_ABS - 0x03a/ABS_MT_PRESSURE - 75
/dev/input/event0: 17893.959 - 0x00/EV_SYN - 0x002/SYN_MT_REPORT - 0
/dev/input/event0: 17893.959 - 0x00/EV_SYN - 0x000/SYN_REPORT - 0

Well, after few days I finally login in chroot. Sadly, I still didn't find a way how install mce-tools package and run evdev. I stucked on ipforwarding in Ubuntu :(