network problem after kernel update

Posted:
Nov 22nd, '14, 02:21
by ftriscari
My current kernel is
3.12.25-desktop-3.mga4
and everything works ok.
When I upgrade to a newer kernel I'm unable to use the wifi. the system is unable to connect to the router.
the wifi driver is
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lspci | grep -i wireless
05:00.0 Network controller: Qualcomm Atheros AR928X Wireless Network Adapter (PCI-Express) (rev 01)
when I boot with a recent kernel I can see
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iwconfig
wlp5s0 IEEE 802.11bgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=16 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
enp3s0 no wireless extensions.
lo no wireless extensions.
from what I can read in the wiki this is a problem but I'm unable to find a way forward.
could you help my with solving this problem?
thanks
FT
Re: network problem after kernel update

Posted:
Nov 22nd, '14, 10:07
by doktor5000
Could you please show the output of
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lspcidrake -v | grep -i wireless
ps -ef | grep -v grep | grep -ie net -e wpa
and, as root:
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journalctl -b -u network --no-pager -a
journalctl -ab | grep -iE "fw|firmware|iwl|wifi|wire|80211"
Re: network problem after kernel update

Posted:
Jan 7th, '15, 20:13
by ftriscari
I'm still having the same problem even with the latest kernel update.
can anyone help with this?
thanks
FT
Re: network problem after kernel update

Posted:
Jan 8th, '15, 05:02
by oj
The update today (Jan 7 2015) prevents my system from booting entirely. In 'failsafe' I get to a desktop with no wifi. I had the exact same thing happen today with an update to fedora 20. Is there some unseen impetus behind today's "update?"
I had to revert to kernel ..12.23 and still had to use 'failsafe' to get to a desktop. It'd be nice to have a windows-like systemrestore in times like this.

Re: network problem after kernel update

Posted:
Jan 8th, '15, 16:04
by doktor5000
Dou you have the same wifi adapter and driver as the OP?
For the issue with the system not booting, maybe see
viewtopic.php?f=23&t=8863
Re: network problem after kernel update

Posted:
Jan 9th, '15, 17:20
by oj
No, my adapter is broadcom:
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wl : Broadcom Corporation|BCM4312 802.11b/g LP-PHY
I'll give the nvidia driver fix a try. Meantime, it seems the broadcom module is not being rebuilt. As I mentioned I have the same problem with a fedora update, also with broadcom hardware.
EDIT: got it fixed, thanks. The nvidia rebuild did the trick. For the wireless all I did was remove the connection and run the setup again. Fortunately the transmitter was on and it found the device. I haven't been so lucky on that fedora machine, it can't see the hardware. (transmitter is off, no switch)
Re: network problem after kernel update

Posted:
Jan 10th, '15, 11:43
by ftriscari
no resolution for me... I'm still unable to use a newer kernel as this will kill my wifi...
do you have any ideas on how to solve this?
thanks
FT
Re: network problem after kernel update

Posted:
Jan 11th, '15, 17:18
by oj
ftriscari,
Have you tried what I did, removing the connection then setting it up again with the tool in mcc?
If it doesn't find the device it's most likely that the transmitter is off. Too many laptops do not have a hardware switch to toggle the transmitter, they rely on a "software switch" meaning a proprietary (aka 'secret') windows kernel "switch." The trick for most Linux distros is to get the transmitter on so normal setup can ensue.
I've used a number of tricks. If the machine has dual boot, I've booted into windows first, which turned the xmitter on, the did a reboot into Linux. (that is not a complete shutdown/startup) This worked on about 90% of such machines. Some laptops shut the xmitter off when reading BIOS no matter what. If you have one of them you may never get wireless working. At least not with the distro you want to use. As an example, I had one laptop that fedora would start the transmitter but Mageia, PCLinuxOS and others I like to use did not. I just bit the bullet and used fedora on that one.
Any way you can think of to do the reboot trick would work, it doesn't have to be windows. Maybe you could boot a live cd/dvd of a distro that does handle the device, then restart back into Mageia. (hoping the transmitter stays on)
The only other advice is to poke around system setup (BIOS) and see if there's any mention of wifi, and make changes. (when testing BIOS changes only change one thing at a time, and if it doesn't help, set it back to where it was) I had one system that had a wifi-related option like "allow soft switch." It seemed counter intuitive, but turning that off actually resulted in the transmitter being on full time. Alas, I only saw that work on that one computer.
Nevertheless, it can't hurt to change some settings.
And of course I must mention that if you do have a hardware switch, make sure it's on, or try turning it off and on to see if the system awakes to the arrival of 'new hardware.'