Tag: quick tips

[Quick Tips] How to fix Mouse Disappears after unlock issue

The Mouse Disappears after unlock problem is not common error and I’ve just faced it when using light-locker / lightdm combined with XFCE4. Each time my screen goes blank after idle time is reached and I relogin, the mouse pointer becomes invisible but active. You can still move the mouse and you can see (because it highlights the window) as you move it around and you can click and right click but the cursor is not displayed on the screen. If I restarting the Xserver, everything backs to normal, but I lost my working session.
After researching on the Internet about this problem, I find the cause of this problem is light-locker package. I’ve tried to remove light-locker and boot my system with gdm and xscreensaver packages installed. It’s working flawlessly without disappeared of mouse after relogin.
This has been a known issue for some time with light-locker and xorg-x11-server. You can read more about it at #815135, #80, #94677… There are bug reports all over the place but no solution yet, e.g. In my exprienced, it’s depended on your system hardwares (Intel graphics) and linux distros (using XFCE4 as Desktop Environment). It’s fixed on my laptop after light-locker upgraded to newest version but my home station is not yet. This is often observed in systems that lock the session and return to the greeter (including at least Xubuntu, Ubuntu Mate, and elementary OS).
Here are some methods that will help you solving it.

Permanent Method

Switch to another lock screen and windows manager packages instead light-locker or upgrade / downgrade it until this problem fixed.

Temporary Method

$ xset dpms force off 

Quick press any button to active and light on your screen, you will find your mouse pointer restored again.
Another way will help you restoring the mouse pointer by switching to another virtual screen TTY for example Ctrl + Alt + F1 then back to the Ctrl + Alt + F7
Another hard way is switch your mouse cursor theme will restore the pointer again.
Notes: Don’t use lightdm build-in lock screen utility by dm-tool switch-to-greeter or dm-tool lock command, because the lock screen can be circumvented by switching to console.

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How to fix Wired / Wi-Fi Network Device Not Managed Issue

How to fix Wired / Wi-Fi Network Device Not Managed Issue

After a recent reboot it stopped working, saying “device not managed” and you won’t be able to connect to internet. This error only happened if you’re using Network Manager to manage the network connection. For most of the time, this program works flawlessly, but it is not perfect. Now, you’re facing the problem with Device not managed issue by NetworkManager
With my exprienced, it does seem happen to Wired and Wireless Network Interfaces.

If you got this problem and this guide takes you through step by step procedures on fixing “Wired / Wi-Fi Network interface Device not managed error” in almost Linux distros from Ubuntu, Debian, Fedora, Arch Linux, Kali Linux and more …
Continue reading

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Quick Tips – Disable Laptop Camera (WebCam) in Linux

By default, the modern laptop has built-in camera (webcam) but it’s seem useless because we’ve more better methods and devices to replace it. So, why do you keep it running on your machine. This quick tips will going to show you how to turn off (disable) your laptop’s camera to save the power and increase the battery usage time.
It’s very simple with few command lines.
The thing to do is add blacklist uvcvideo to /etc/modprobe.d/blacklist.conf file. Here is the command:

# echo "blacklist uvcvideo" >> /etc/modprobe.d/blacklist.conf

If the /etc/modprobe.d/blacklist.conf is not exist, you must create it first:

$ sudo touch /etc/modprobe.d/blacklist.conf

Using kernel command line

You can also blacklist modules from the common bootloader like GRUB, Syslinux… Simply add modprobe.blacklist=uvcvideo to your bootloader’s kernel line.

If you are blacklisting more than one module, note that they are separated by commas only. Spaces or anything else might presumably break the syntax.

Restart your computer to apply the changes.

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