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rated 0 times [  3] [ 0]  / answers: 1 / hits: 25541  / 2 Years ago, sat, february 19, 2022, 2:52:36

I'm really struggling to have working wifi on my laptop lenovo E540. I googled about my network card using ubuntu, but nothing solved my problem.

First of all, I installed Ubuntu 14.04.1 LTS 64-bit. I could use wifi, but after few minutes it would turn off and I could not connect to wifi again. So I started googling.

lspci:



Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter


First of all, I found this thread with comment 29 to be helpful for many users having same controller as me. So I installed it and got kernel panic. I googled more. Found kozak127's edited rtl8723be. Tried it, got kernel panic.

Here is suggested to use older kernel. No differece there for me.
My kernel:



3.13.0-35-generic


So my question is: Is there a way to get this realtek controller working? how?



Offtopic: I bought a new laptop, so I would have less problems than I had with lenovo n500 and ubuntu. Is there a brand that works great with linux? I looked up lenovo n540 and linux compatibility and no problems were reported there.



EDIT 1:



/etc/modprobe.d/rtl8723be.conf

/lib/modules/3.13.0-32-generic/kernel/drivers/net/wireless/rtlwifi/rtl8723be

/lib/modules/3.13.0-32-generic/kernel/drivers/net/wireless/rtlwifi/rtl8723be/rtl8723be.ko

/usr/src/linux-headers-3.13.0-32/drivers/net/wireless/rtlwifi/rtl8723be

/usr/src/linux-headers-3.13.0-32/drivers/net/wireless/rtlwifi/rtl8723be/Makefile

/usr/src/linux-headers-3.13.0-32-generic/include/config/rtl8723be.h

/usr/src/linux-headers-3.13.0-35/drivers/net/wireless/rtlwifi/rtl8723be

/usr/src/linux-headers-3.13.0-35/drivers/net/wireless/rtlwifi/rtl8723be/Makefile

/usr/src/linux-headers-3.13.0-35-generic/include/config/rtl8723be.h

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 Answers
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The system natively includes the driver rtl8723be. We need to troubleshoot the native driver. Before we do so, please uninstall the two drivers you installed that caused kernel panics. Follow the process you followed previously for both, except instead of make and sudo make install, do sudo make uninstall.



Then do:



gksudo gedit /etc/modprobe.d/blacklist.conf


Use nano or kate or leafpad if you don't have the text editor gedit. Remove the line: blacklist rtl8723be. Proofread carefully, save and close the text editor.



Now do:



sudo modprobe rtl8723be swenc=1

sudo iwconfig wlan0 power off


Is your wireless working better now? If so, we'll amend a couple of files and make it permanent.



It appears that, somehow, the rtl8723be was deleted in the process of trying two replacements that failed by causing kernel panics. Let's try to reinstall the current linux-image. With a working internet connection:



sudo apt-get install --reinstall linux-image-$(uname -r)


After it's done, retry the steps above.


[#23432] Saturday, February 19, 2022, 2 Years  [reply] [flag answer]
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