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Old 20th February 2017, 01:22 PM
P1ngu1n Offline
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Question Macbook Pro 7,1 & 4.9.9 Kernel update

So I have updated my mid 2010 Macbook pro to the 4.9.9 kernel twice now and for some reason it is disabling my wifi. I wanted to know if any other Macbook pro users have experienced this issue and is there a fix. I've been googling and searching on here, but haven't come across any fixes.
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  #2  
Old 20th February 2017, 04:02 PM
bobx001 Offline
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Re: Macbook Pro 7,1 & 4.9.9 Kernel update

Quote:
Originally Posted by P1ngu1n View Post
So I have updated my mid 2010 Macbook pro to the 4.9.9 kernel twice now and for some reason it is disabling my wifi. I wanted to know if any other Macbook pro users have experienced this issue and is there a fix. I've been googling and searching on here, but haven't come across any fixes.
Interesting hardware. Any chance of posting a dmesg here ?
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Old 20th February 2017, 11:16 PM
P1ngu1n Offline
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Quote:
Originally Posted by bobx001 View Post
Interesting hardware. Any chance of posting a dmesg here ?


Would this imply me applying the update again? lol I have rebuilt to the version prior to the update.


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Old 21st February 2017, 12:40 AM
chrismurphy Offline
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Re: Macbook Pro 7,1 & 4.9.9 Kernel update

I'm confused. At startup you should get a GRUB menu with a list of kernel versions. Once you have applied an update with a newer kernel version, it's the default in the menu, but you can reboot and choose an older kernel version.

It's important to make sure this is due to a kernel update and not some other component that was updated.
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Old 21st February 2017, 12:57 AM
P1ngu1n Offline
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Quote:
Originally Posted by chrismurphy View Post
I'm confused. At startup you should get a GRUB menu with a list of kernel versions. Once you have applied an update with a newer kernel version, it's the default in the menu, but you can reboot and choose an older kernel version.



It's important to make sure this is due to a kernel update and not some other component that was updated.


Excuse my ignorance. I am not super familiar with Linux lol (n00b here). I'm actually in a intro linux course so this has been a learning experience for me. Can I individually install each update rather than doing a bulk update to try and pin point what is causing the issue because I know the jkernel update is important.


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  #6  
Old 22nd February 2017, 05:33 AM
chrismurphy Offline
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Re: Macbook Pro 7,1 & 4.9.9 Kernel update

Is this a Fedora Workstation installation? If so the desktop environment is GNOME, and GNOME has a program called Software. It's kinda sorta like the App Store on a Mac/iPhone, or Google Play on Android. You can search for and install/uninstall individual apps, and it has a graphical user interface. Any updates are pretty much just a one shot. That is, all updates show up in Software as "OS Updates" they don't appear individually. So it's an all or nothing thing.

On the command line, you can use dnf to update things individually. So you can do something like

dnf update kernel
dnf update firefox

But even if you apply the OS Updates with GNOME Software, always three kernel versions are kept. The most recent installed is the default, but it's possible to choose from the menu the previous kernel so you can troubleshoot regressions. Choosing the older kernel only causes that kernel version to be used, it does not revert any other software updates. But the kernel contains all the low level drivers, like video and wireless.

So if you do an update and wireless stops working, it could be a wireless firmware update that's bad, or it could be NetworkManager, or it could be wpa_supplicant, or it could be the driver in the kernel. It's a bit tedious but you have to isolate to figure out which one is causing the problem. To help isolate, dmesg and journalctl -b can help by showing what's being logged, maybe there's an obvious error happening that'll point to what the problem is.
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Old 26th February 2017, 02:05 AM
P1ngu1n Offline
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Update:

Ran the following:
sudo dnf upgrade kernel

And the kernel upgraded to 4.9.10
I rebooted my machine and no wifi. So it is definitely the kernel itself that is killing my wifi.

Now to rebuild again and report the bug before. Any suggestions as to what information I should gather and present on the bug reporting site.


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Old 27th February 2017, 12:08 AM
chrismurphy Offline
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Re: Macbook Pro 7,1 & 4.9.9 Kernel update

You don't have to rebuild anything. Just pick the older kernel in the boot menu... the one listed 2nd. Just arrow down to highlight it, then enter. You need to do this within 3 seconds of the boot menu appearing or it'll boot the newest kernel.

You can make the 2nd kernel the default but it becomes a sticky setting, and you'll want to test newer kernels hopefully it'll get fixed in a newer version.

---------- Post added at 05:08 PM ---------- Previous post was at 05:06 PM ----------

OH and what you want do to is this:

'journalctl -b -o short-monotonic > journal_nowifi.log'

That'll capture kernel, and NetworkManager messages.
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Old 13th March 2017, 02:28 AM
P1ngu1n Offline
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Re: Macbook Pro 7,1 & 4.9.9 Kernel update

Quote:
Originally Posted by chrismurphy View Post
You don't have to rebuild anything. Just pick the older kernel in the boot menu... the one listed 2nd. Just arrow down to highlight it, then enter. You need to do this within 3 seconds of the boot menu appearing or it'll boot the newest kernel.

You can make the 2nd kernel the default but it becomes a sticky setting, and you'll want to test newer kernels hopefully it'll get fixed in a newer version.

---------- Post added at 05:08 PM ---------- Previous post was at 05:06 PM ----------

OH and what you want do to is this:

'journalctl -b -o short-monotonic > journal_nowifi.log'

That'll capture kernel, and NetworkManager messages.
Haha I didn't fully read your comment before re-installing the OS . It was definitely the kernel. I upgraded the Kernel only and wifi was no longer available. I will be staying away from the update until that is fixed (unless I can update all other aspects except the kernel).
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Old 14th March 2017, 03:01 AM
chrismurphy Offline
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linuxfedorafirefox
Re: Macbook Pro 7,1 & 4.9.9 Kernel update

Quote:
Originally Posted by P1ngu1n View Post
Haha I didn't fully read your comment before re-installing the OS . It was definitely the kernel. I upgraded the Kernel only and wifi was no longer available. I will be staying away from the update until that is fixed (unless I can update all other aspects except the kernel).
Code:
dnf update --exclude=kernel-*
That should do it; check the whole list, usually the kernel is listed at the top of the proposed list of updates. You can also insert an exclude line in dnf.conf, do man dnf.conf to read up on that.

What I suggest is looking up your wifi make model with lspci command, and then doing a search for that make model at bugzilla.kernel.org to see if anyone has reported it. It's not going to get fixed if no one reports it. And it could literally be months unreported. The sooner a bug is filed the sooner it can be fixed. Ideally you do a simple bisect, which maybe you've done if you know the last version it works and the first version kernel it doesn't work in; and you can include that in the bug report.

Even better is if you do a bisect, that narrows down the regression to the exact commit that caused the problem and will point the finger at a specific person :-) and that usually gets rather quick attention.
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  #11  
Old 17th March 2017, 03:24 AM
P1ngu1n Offline
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linuxfedorafirefox
Re: Macbook Pro 7,1 & 4.9.9 Kernel update

Bug has been reported. Bug ID: 194903
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