USB devices not working after boot

[Mattia Biondani]

I'm having issues with a touchscreen monitor. Basically, every time Android x86 8.1 r5 boots up I have to turn off then turn on again the monitor in order for the touchscreen to work.

The touchscreen works via USB.

Is there a way to reload all USB devices at startup? Do I have to edit the init.sh file?

Thanks,

Mattia.

[Michael Goffioul]

I had a similar problem on my device and it was due to the quick succession of loading hid-generic (built-in) and hid-multitouch (module) drivers. I ended up recompiling the kernel with hid-multitouch built-in and the problem went away (because hid-generic was then never loaded for the touchscreen). Check dmesg to see whether you have hid-generic and hid-multitouch logs close to each other for the same device. Also check lsmod output, if hid-multitouch is present, try to unload it (rmmod) then reload it (modprobe) and see whether the touchscreen works.

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[Mattia Biondani]

Hi Michael,

thanks for the advice.

I checked the logs and hid-generic and hid-multitouch are indeed very close to each other for the touchscreen device. Reloading hid-multitouch does solve the issue.

So just to be clear: do I need to add this file in kernel/drivers/hid and then rebuild and the problem will go away?

[Michael Goffioul]

If you are compiling android-x86 yourself, you can try editing kernel/arch/x86/configs/android-x86_64_defconfig (or android-x86_defconfig for 32bits kernel) and change CONFIG_HID_MULTITOUCH=m to CONFIG_HID_MULTITOUCH=y. To make sure the kernel is recompiled, just delete directory out/target/product/x86/obj/kernel/.

To view this discussion on the web visit https://groups.google.com/d/msgid/android-x86/e6efd222-c4c7-48e6-a80f-1a55e14dc59an%40googlegroups.com.

[Mattia Biondani]

Thank you, I will try that.

[Mattia Biondani]

Hi Michael, 

your solution seems to have worked. Now the touchscreen works even if there's a USB drive connected to the PC.

Thank you very much,

Mattia.