QEMU/KVM USB tablet issue (and a fix)

[Alexander E. Patrakov]

Hello.

I have tried to run Android-x86 in "KVM" virtual machine software. It worked OK, until I decided to add a USB tablet, so that I could avoid mouse pointer grab, and, ideally, use my touchscreen. The problem is - it works only for older versions, the latest working one is 4.4. Later versions of Android (unlike any other OS) think that the USB tablet presented by QEMU is a touchpad (relative input device), and not touchscreen (which is absolute). Fortunately, it is easy to fix, and I want it to be fixed in the next build, and ideally propagated to all affected stable releases.

More details:

I installed Android-x86 in QEMU like this:

mkdir android

cd android

dd if=/dev/null of=hda.dsk bs=1G seek=4

qemu-system-x86_64 -m 2048 -enable-kvm -smp 4 -hda hda.dsk -cdrom /tmp/android-x86_64-8.1-rc2.iso -vga std

Then I tried to add a USB tablet:

qemu-system-x86_64 -show-cursor -m 2048 -enable-kvm -smp 4 -hda hda.dsk -display sdl -vga std -device qemu-xhci -device usb-tablet

This resulted in a weird mouse (not moving at all unless a button is pressed), until I added this override:

mkdir -p /data/system/devices/idc

echo 'touch.deviceType = touchScreen' > /data/system/devices/idc/Vendor_0627_Product_0001.idc

chown -R system:system /data/system/devices

Obviously, in the released images, this should go to /system/devices/idc instead.

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Alexander E. Patrakov

[Chih-Wei Huang]

Thank you for the report.
I've added the idc file.
Alexander E. Patrakov <patr...@gmail.com> 於 2018年11月22日 週四 下午2:48寫道：

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Chih-Wei
Android-x86 project
http://www.android-x86.org

[Frederik Carlier]

Hello,

 

I have the same issue – android-x86 not detecting the qemu USB tablets as an actual tablet.

 

I’m trying your approach on Android 7.1-r2 but this doesn’t seem to work.

On which version of android-x86 did you get this working?

 

Based on https://source.android.com/devices/input/input-device-configuration-files, it also seems like the .idc file should go to /system/usr/idc rather than /system/devices/idc, is that correct?

 

Thanks,

 

Frederik.

 

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[Alexander E. Patrakov]

I have tried this on release 8.1-rc2. Note: I have not actually tried
to put it into /system, as that requires rebuilding the image, and I
don't want to rebuild. I.e., tested only with
/data/system/devices/idc. So yes, you are right, I indicated the
incorrect /system path in the initial email.
вт, 11 дек. 2018 г. в 23:29, Frederik Carlier <frederik...@quamotion.mobi>:

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Alexander E. Patrakov