Android-x86-8.1r5

Android-x86 on the Toshiba Encore 2 [WT8-B/WT10-A]

Android-x86_64 [v8.1r5] running on a Toshiba Encore 2 [WT8-B/WT10-A] tablet.

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Installation Instructions

• Download latest pre-built image here   |   View all builds
• Use Rufus to create USB drive installer.
• Ensure device is running the latest BIOS version!
• Use OTG adapter to connect USB drive and keyboard to device and press F12 at bios logo and choose <Enter Setup> then disable Secure Boot and select Save and Exit.
• Press F12 again and select the USB option to boot from USB device.
• Select Live to test Android directly from USB, or choose Auto-Install to install Android-x86 to the internal storage (mmcblk1).
• If installing, choose the internal storage device (mmcblk1) and click Yes and allow for installation to finish and then select reboot.
• Note you should login to a Google account and update all pre-installed applications to ensure proper functionality after fresh install.
• Enjoy your WT8-B/WT10-A running Android-x86!

Recent Bugfixes and Improvements

• 2020-11-23:

  • Updated to Kernel 5.8.0 for better Baytrail/Cherrytrail device support
    • This improves s2idle issues introduced in kernel 5.2 or greater
    • s0ix is now working properly! (improves power consumption during sleep)
    • This kernel also provides proper PWM_LPSS support (no patches needed to enable backlight)
  • Recompiled youling257 rtl8723bs driver with k5.8 support
  • Removed hibernation support from kernel (unsupported by device) and updated Auto-Installer to not create swap partition.
  • Added setprop power.nonboot-cpu-off 0 and setprop sleep.state force via /etc/init.sh script (enables sleep and s0ix support)
  • Removed /etc/scripts/sleep.sh script (unnecessary now that libsuspend is properly invoking s2idle via sleep.state=force property)
  • Fixed terminal and nano dipslay to fill screen when running as superuser (added terminal line settings)
  • Looking to improve support for bytcrrt5640 in next release (still using /etc/scripts/audio.sh to achieve this for now)
  • Removed unnecessary kernel boot arguments

• 2020-11-13:

  • Improved power consumption / standby mode by enabling proper suspend-to-ram functionality!
    • Added /etc/scripts/sleep.sh script to trigger suspend-to-ram (s2idle) after 1min of sleeping w/o network activity
  • Improved boot time by removing AUTOLOAD=old boot arg and using newer autoloading method
    • Updated 0-auto-detect script in initrd.img to modprobe gpio_keys and hid_multitouch which sometimes failed to autoload properly
  • Re-applied some kernel patches for improved device support:
    • Applied drm-i915-Disable-preemption-and-sleeping-while-using-the-punit-sideband patch (more info)
    • Applied 1-2-extcon-intel-cht-wc-Make-charger-detection-co-existed-with-OTG-host-mode and 2-2-extcon-intel-cht-wc-Enable-external-charger (more info)

• 2020-11-06:

  • Recompiled latest r5 kernel (4.19.122) from source and applied minimal patches
  • Improved Wi-Fi support and random disconnects via alternate rtl8723bs driver
  • Updated auto-installer script to create swap partition needed for hibernation
  • Resquashed system.img -> system.sfs and extracting via auto-installer
  • Updated GRUB loader with prettier theme

• 2020-11-03:

  • Added support for Toshiba WT10-A
  • Fixed "audio pop" issue with touch events when using headphones via /etc/scripts/pop-fix.sh script
  • Fixed headphone switching on boot (audio will automatically output to headphones if connected on startup)
  • Fixed levels for external headset microphone
  • Improved nano terminal support
  • Improved scrolling of device

Kernel Build Instructions

To build from source, follow the instructions at Android-x86.org

• Download latest repo for Android-x86 8.1r5:

   mkdir android-x86-8.1r5
   cd android-x86-8.1r5
   repo init --depth=1 -u http://scm.osdn.net/gitroot/android-x86/manifest -b oreo-x86 -m android-x86-8.1-r5.xml
   repo sync -c -j4 --no-tags --no-clone-bundle
  

• Use latest 5.8.0 kernel

   rm -rf kernel; mkdir kernel; cd kernel
   git clone -b kernel-5.8_si_next --single-branch --depth=1 https://github.com/maurossi/linux.git .
  

• Replace external/kernel-drivers with 5.8 versions:

   rm -rf ../external/kernel-drivers; mkdir ../external/kernel-drivers; cd ../external/kernel-drivers
   git clone -b kernel-5.8 --single-branch --depth=1 https://github.com/maurossi/kernel-drivers .
  

• Replace staging driver for rtl8723bs with youling257 driver:
  • Clone the latest branch of youling257's driver via git clone https://github.com/youling257/rockchip_wlan.git
  • Move the rtl8723bs folder to ./kernel/drivers/net/wireless/realtek/
  • Add references for this to the ./kernel/drivers/net/wireless/realtek/Makefile and ./kernel/drivers/net/wireless/realtek/Kconfig files:
    • In Kconfig add source "drivers/net/wireless/realtek/rtl8723bs/Kconfig"
    • In Makefile add obj-$(CONFIG_RTL8723BS) += rtl8723bs/
  • Modify ./kernel/drivers/net/wireless/realtek/rtl8723bs/Makefile to avoid issues with include paths during source compile:
  • Delete/replace line 24: EXTRA_CFLAGS += -I$(src)/include with the following three new lines:

    EXTRA_CFLAGS += -I/android-x86/kernel/drivers/net/wireless/realtek/rtl8723bs/include
    EXTRA_CFLAGS += -I/android-x86/kernel/drivers/net/wireless/realtek/rtl8723bs/hal/phydm
    EXTRA_CFLAGS += -I/android-x86/kernel/drivers/net/wireless/realtek/rtl8723bs/platform
    

  • Modify the values above after EXTRA_CFLAGS += -I/ with the full path to your Android-x86 source files!
  • Then replace line 156 (now line 158 after completing the above edit) from this: export TopDIR ?= $(shell pwd)
  • To instead be: export TopDIR ?= /android-x86/kernel/drivers/net/wireless/realtek/rtl8723bs/
  • And again modify this line above with the full path to your Android-x86 source files!
  • Remove inclusion of the original driver by deleting the references to rtl8723bs from Kconfig and Makefile files in kernel/driver/staging folder
  • And now you can build away:

     . build/envsetup.sh; lunch android_x86_64-userdebug
     make kernel -j8
    

Additional Build Details

• Replaced staging rtl8723bs driver with youling257's version for improved wirless connectivity.
• Added acpi_backlight=vendor boot args to GRUB (android.cfg) to resolve black screen when resume from sleep.
• Added sdhci.debug_quirks=0x10000 boot arg to GRUB (android.cfg) to resolve SD card read-only issue.
• Added nospectre_v2 to remove Spectre v2 vulnerability nag message from kernel output on boot
• Updated 0-auto-detect script in initrd.img to modprobe gpio_keys and hid_multitouch which sometimes fail to autoload properly.
• Updated /system/etc/init.sh startup script and added WT8-B/WT10-A to init_hal_sensors function to enable sleep and configure sensors (screen rotation and gyroscope).
• Updated /system/etc/init.sh startup script and added WT8-B/WT10-A to do_bootcomplete function to run custom scripts (headphone switching / audio pop fix).
• Enabled navtivebridge support by default and included houdini in the pre-built image, and fixed url link issue with /system/bin/enable_nativebridge script.
• Updated build.prop with optimizations for better GPU and system performance.
• Removed taskbar, calibration and developer tools apps from pre-built image.
• Updates Android-x86 GRUB loader with prettier theme.
• Added ES File Explorer to pre-built image.
• Added nano to pre-built image.

Known Bugs and Issues

• Cameras do not work (no kernel support) Note k5.8 has ressurected the atomisp driver and camera support may be possible in the near future! Tested a build w/atomisp enabled but camera sensors are failing to power up, still debugging)
• Internal microphone not working (bug/kernel issue with bytcrrt5640, testing quirks to try and resolve).
• Bluetooth is partially working but not reliably discovering or connecting to all devices.
• Formatting SD card with Android isn't working (cannot be used for internal app storage - format with PC for use as portable storage).
• Add AUTO_LOAD=old boot arg to GRUB (android.cfg) if you experience issues with touchscreen and power button not working.
• Baytrail/Cherrytrail devices suffer from a c-state bug with linux, which can cause issues with freezing or resuming from standby, but this latest build is fairly stable.
• If having issues resuming from suspend/sleep, you can try using intel_idle.max_cstate=1 and i915.enable_execlists=0 boot args in GRUB (android.cfg), YMMV.
• For Netflix support, use version 4.16 build 15172

Notes

• Special thanks to @cwhuang and @youling257 for their support.
• Thanks to João Santos for testing WT10-A support.
• Honourable mention to Mr. James P. Kelly, who gave me this tablet he obtained on a five-finger discount after a delayed flight.   #RIP
• See this topic on the Android-x86 Google Group for more information and further assistance if necessary.