Installing Debian testing (Buster) on the Jumper EZbook S3 notepad.
We downloaded the netinst image debian-buster-DI-alpha3-amd64-netinst.iso from the Debian Installer Page and copied over an USB memory stick (using dd, destination the whole device).
During the installation we had an USB-Ethernet dongle connected, because the WiFi is almost certainly non-working. The product we used is identified on the USB bus as 0bda:5401: USB3.0 Hub with gigabit Ethernet.
We had to install the following non-free packages, to obtain the required firmwares:
Everything went flawlessy with the Debian Installer: during manual partitioning we removed the main Windows partition (about 240 Gb) and a 700 Mb Windows Recovery partition. We leaved the first two reserver partition and created swap and rootfs:
|1||105 Mb||EFI system partition|
|2||16.8 MB||Microsoft reserved partition|
The EFI boot loader was copied into the first partition, you can see it mounted into /boot/efi/EFI/debian/grubx64.efi.
The integrated WiFi card is attached to the USB bus, it is identified by ID obda:b720.
The WiFi did not work with the stock installation. The scanning for available access points is indeed working, but associating fails. After the failed association, even the scanning stops working. We upgraded the kernel to linux-image-4.17.0-1-amd64 in the hope that this will fix the WiFi problem, but nope.
We downloaded the sources of a kernel module (developed by lwfinger) which expressly states the compatibility with that device obda:b720. This is the source code GitHub page.
apt-get install git build-essential cd /usr/local/src git clone https://github.com/lwfinger/rtl8723bu.git cd rtl8723bu # In Makefile: commented-out the line EXTRA_CFLAGS += -DCONFIG_CONCURRENT_MODE make make install
This will install a new kernel module into /lib/modules/4.17.0-1-amd64/kernel/drivers/net/wireless/8723bu.ko and execute
depmod to update the kernel modules list.
The kernel module will not survive a kernel upgrade (it should be recompilerd and reinstalled), so we have deinstalled the pseudo package linux-image-amd64 and leaved only the specific linux-image-4.17.0-1-amd64, to avoid automatic upgrades. The kernel module should be compatible with DKMS (the Debian kernel modules auto-building system), but our first try failed, so we went with the manual mode.
To be safe, blacklist the original kernel module by writing into /etc/modprobe.d/blacklist.conf the line:
After a reboot you should find (
lsmod) the module 8723bu loaded, instead of rtl8xxxu. Scanning for WiFi netwroks and association should work.
The WiFi adapter does not resume after the stand-by! It seems there is the issue #91 into the lwfinger rtl8723bu module, but already fiexd? A manual workaround is:
rmmod 8723bu modprobe 8723bu
An automatic workaround seems to be creating an executable file /lib/systemd/system-sleep/fix-wifi with:
#!/bin/sh case $1/$2 in pre/*) ;; post/*) modprobe -r 8723bu modprobe 8723bu ;; esac
Tried with success the command line version of the commands:
systemctl suspend systemctl hibernate
The hibernate requires a swap partition equal or greather than the available RAM.
xevsays that Enter sends
Return, but changing keysym with
xmodmap -e "keysym KP_Enter = Return"does not resolve. Use