Internal microphone not detected and hence not working

I recently installed Ubuntu 19.10, wiping Windows 10, and my internal microphone isn’t working. I tried installing Pulse Audio, alsamixer and there there is no internal mic being detected.

Input settings screenshot

However, when I connect a headphone with mic, it works fine. I also tried to add few combinations under /etc/modprobe.d/alsa-base.conf file, following few blogs, unsuccessfully.

alias snd-card-0 snd-hda-intel  options snd-hda-intel model=auto 

I tried things from the below link as well but unfortunately didn’t work

Under alsamixer the card is HDA Intel PCH and Chip is Realtek ALC3204

Note: My Laptop config is like this

Laptop config

Any and all kind of help is appreciated.

Thanks in advance.

PS: I am a newbie, who has just started to learn and my first step was to install the OS.

How to model internal queues shared between services in queueing networks

I am trying to model a load balancer as a queueing network.

The load balancer has a number $ n$ of internal threads. There is a central queue of requests from which the threads are fed. Each thread can handle one request at a time: It parses it, forwards it to one of 3 servers, and waits for the response, then sends the response back.

The servers themselves process requests sequentially. Therefore, I think the servers should be modelled as something similar to a M/M/3 queue.

On the other hand, the internal threads should be modelled as a M/M/n queue.

The central issue is that the threads are blocking while they wait for the response from the servers. Therefore we cannot simply model the server queue to be sequentially connected to the thread queue.

What I would need is some kind of way to model a queue M/M/3 inside and shared between the service providers of a M/M/n queue.

Is there a way to do this in queueing networks, and if no, how would you work around this issue?

Sharepoint Internal names of Person or group column gets changed on taking list template

I have created a person or group column in list. When I take list template and use it in other site the internal name of the person or group column gets changed. I have used the internal names of this column in my code. Now due to this mismatch of internal names the code is failing.

SharePoint 2013 workflows internal status is “Suspended”

On item create, the workflow goes into suspended mode with the following information:

RequestorId: e55d1c73-4536-5312-0000-000000000000.
Details: An unhandled exception occurred during the execution of the workflow instance.
Exception details: System.IO.InvalidDataException: Unable to deserialize HTTP response content. Expected ContentType : ‘application/json’, ‘text/plain’ or ‘text/html’, Received ContentType : ‘text/html’. Content (truncated) : ”. ResponseStatusCode : ‘OK’ Request Uri : ‘’bc9db790-45a6-4bf5-83c9-427abdf46e30′)’ at Microsoft.Activities.Hosting.Runtime.Subroutine.SubroutineChild.Execute(CodeActivityContext context) at System.Activities.CodeActivity.InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager) at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation)

internal server error – error 500

I have just completed a project and i am faced with this issue of error 500 (internal server error). On click of the login button the server is unable to find the php file with the login script.
However i have uploaded the same project onto another server but surprisingly everything works fine on the other server.

What could be the problem and how do i solve it?

Thank you.

How to set read+executable permission in internal drive when chmod 777 * is not working?

I have installed ubuntu 18.04.3 LTS in my system 3 months ago. After 2 months, I don’t have the read and write permission on any internal drive except my system drive. I have used chmod -R 777 * in all 4 internal drives. Still I am not able to get the write permission. Every time I use chmod -R 777 *, It sets read only permission to every file.

That’s the console output I am getting.

chmod: changing permissions of ‘filename.jpg’: Read-only file system

chmod: changing permissions of ‘filename.mp4’: Read-only file system