Broadcom BCM4313 - errors on Ubuntu 18.04.5 and Ubuntu 20.04.1

For diagnostic purposes please provide the output of the commands

uname -a
lsb_release -crid
sudo lshw -C network
lspci -nnk | grep -iA2 net
lsusb

(The first command will show your computer name, if you want to keep it secret you are free to obfuscate it.)

uname -a

5.4.0-65-generic #73~18.04.1-Ubuntu SMP Tue Jan 19 09:02:24 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

lshw -C network

*-network
       description: Wireless interface
       product: BCM4313 802.11bgn Wireless Network Adapter
       vendor: Broadcom Inc. and subsidiaries
       configuration: broadcast=yes driver=brcmsmac driverversion=5.4.0-65-generic

lsb_release -crid

Distributor ID: Ubuntu
Description: Ubuntu 18.04.5 LTS
Release: 18.04

I don't know why you asked me about lsusb and lspci. I think that USB devices are not problem. I didn't wrote all information for safety reasons. I only can send this to developer but not for the forum community.

Do you know if I create report with ubuntu-bug command where these information are sended? To launchpad? I don't want to send this information for public.

Thanks.
Codename: bionic

I asked for the output of lspci (with a certain filter), because it is important to know the vendor-ID and device-ID of the WLAN device. And the question for the lsusb output was because some WALN devices are connected by USB (based on your answer I guess it is not the case here).

Nevertheless, based on the information provided by you and the document https://help.ubuntu.com/community/WifiDocs/Driver/bcm43xx I suggest that you change to the bcmwl-kernel-source driver.

On lsusb output

I can see Broadcom Corp. BCM2070 Bluetooth 2.1 + EDR. So this is a bluetooth card. I don't know if it the same device. I think that no but I am not sure. I think that bluetooth and wi-fi is supported by this same device but like you can see there are diffrent names.

On lspci -nnk output

BCM4313 802.11bgn Wireless Network Adapter
Kernel driver in use: bcma-pci-bridge
Kernel modules: bcma

I don't know if it safe to share public with id of vendor and device but I think that I uploaded enough information. I can upload more but for developer - Cannonical people.

"I don't know if it safe to share public with id of vendor and device"

Of course it is safe to share the vendor id and device id.
They are not unique serial numbers, but a numerical id that has been allocated for a certain manufacturer, respectively for a certain product. Everybody worldwide who has such product, has the same numbers.

Do these messages cause any issues with the wireless connection?
Those aren't errors, just info that gets entered into the system log

I don't have problem with wireless connection but on low canals. I musted change settings in my routers because I had problem with connection on some canals.

Okay so why Xubuntu 20.04.1 showed me these messages when I run system? If this is not error so why this showed?

I found also on dmesg:

[ 13.771xxx] b43: probe of bcma0:1 failed with error -524

So I have some error.

I have also this error on Ubuntu 18.04.5:

[ 7.5144xx] EXT4-fs (sda5): re-mounted. Opts: errors=remount-ro

I have also two ACPI errors. What is it?

"[ 7.5144xx] EXT4-fs (sda5): re-mounted. Opts: errors=remount-ro"

This is an informational message, telling that the hard disk partition /dev/sda5 was successfully mounted.
It is a success message and not an error message.

If you are afraid because of the word "error" in that message:
The message just informs that the mounting was done with the option "errors=remount-ro", which means that in case that the system detects a problem with that hard disk partition, then this partition will be re-mounted in read-only mode.
This is completely normal behavior.

And messages about ACPI usually indicate that your computer's BIOS (provided by the manufacturer and independent of the operating system) does not fully comply to the rules and standards for device discovery and configuration and power management. It is very common that a few ACPI warnings are shown in dmesg.

And as a general comment:
In dmesg you do not only see error messages, but also success messages giving the information that something worked.

An example:
issue the command
dmesg | tail
and remember the time code (the numbers in brackets) of the last entry.

The plug an USB data stick into the computer, wait ten seconds and re-issue the command
dmesg | tail

You will see some new messages (with a time code higher than the highest one from before).
These messages just tell that a USB stick was successfully added, and which device name it has got.

Okay, but on Ubuntu 20.04 I have more "errors" in dmesg log. Something with I/O. On Ubuntu 18.04.5 I don't have this. I should not to use focal ? I can write today what errors I have in focal. Maybe this is also not problem.

I noticed also on my computers that when my system is booting my screen flashing. This is not happen on Windows OS. What is the problem? On other computer I have this also.

"Something with I/O."
dmesg messages about I/O may indicate hardware problems.

Please provide the full text that we can check whether it is an informational message or a warning or an error.

Repeating from above:
Not all lines in dmesg are error messages.

Yes, sr0 is the device name for the CD-ROM or DVD drive.
My guess for the messages about sr0 is that the medium that is in the drive is defective (e.g. a scratch on the surface that prevents reading certain data sectors.)

The ACPI message indicates some inconsistency with your computer's BIOS, but this is a very common message that should not do any harm.

and the very last message about b43: Which WLAN driver do you currently use?

I do not see any message that would advise against doing a release upgrade.

Remark: There is no need to obfuscate the numbers in brackets at the start of the line. These just indicate the time when the messages was created in seconds (and fractions) since booting. This is no information that can be used for identifying you or your computer or anything else.

I use on focal this same driver from kernal like in bionic -->

 lshw -C network

*-network
       description: Wireless interface
       product: BCM4313 802.11bgn Wireless Network Adapter
       vendor: Broadcom Inc. and subsidiaries
       configuration: broadcast=yes driver=brcmsmac driverversion=5.4.0-65-generic

I already suggested in comment #3 that you might consider switching to the bcmwl-kernel-source driver.
If you don't want to try that, then I do not see any use in providing additional answers.

I had installed bcmwl-kernel-source but this don't work properly on focal. After upgrade from 20.04 to 20.04.1 my driver was broken and I don't had access to internet so the safest is to stay with brcmsmac because like I said bcmwl-kernel-source have problem in the focal. I don't know what is the problem because on the bionic I don't have problems with bcmwl-kernel-source.

You likely are using the 5.8 kernel on 20.04 as the bcmwl source isn't patched for that kernel, try

wget http://mirrors.kernel.org/ubuntu/pool/restricted/b/bcmwl/bcmwl-kernel-source_6.30.223.271+bdcom-0ubuntu7_amd64.deb
sudo dpkg -i bcmwl-kernel-source_6.30.223.271+bdcom-0ubuntu7_amd64.deb

Now i returned to bionic because focal have too many bugs. I installed first release of focal and via apt update this installed kernel 5.8 instead updating 5.4 so this is not for me in this moment (20.04.0, i named this that but this is simple 24.04).

What kind of help are you now expecting for this question?

@Manfred Hampl, I have some question to the drivers. For the first if I want to install bcmwl-kernel-source during installation of the operating system I must have connection to the internet or this driver is include on the ISO image with Ubuntu?

For second why brcmsmac driver have problem with my network adapter. I heard that this driver is in the linux kernel so why people who wrote brcmsmac didn't fix this problem?

This is my last question. If I will be have trouble with my connection I will return to this subject. Thank you for your time and help.

Sorry, but I do not know whether bcmwl-kernel-source is contained in the installer iso file (but I doubt that it is, because it is in the "restricted" repository category).

"why brcmsmac driver have problem with my network adapter."
Which problem does it have?
I suggest that you go through https://help.ubuntu.com/community/WirelessTroubleshootingProcedure that we can see full diagnostic information to verify.

This brcmsmac driver work perfectly but I have only issue with wi-fi channels. On high number wi-fi channels this have problem with connection to my router. On bcmwl-kernel-source I don't have this issue. So maybe brcmsmac driver should fix this issue? I prefer open source drivers so this is very important to fix it. If they fix it a lot of people can simply install system without additional drivers and this will be great!