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dkms returns Error! The /var/lib/dkms/backport-iwlwifi/8324/5.4.0-113-generic/x86_64/dkms.conf for module backport-iwlwifi includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch. This indicates that it should not be built.

I ran the wireless-info script, the dmesg file contains periodic messages every few minutes about the wifi disconnecting and reconnecting. What can I do? I am on a Lenovo W510 which was solid as a rock under 18.04 LTS.

Karl
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    "the wifi disconnecting and reconnecting" Please check my troubleshooting steps here: https://askubuntu.com/questions/1353705/ubuntu-20-04-wifi-keeps-dropping/1353723#1353723 Welcome to Ask Ubuntu. – chili555 May 24 '22 at 14:49
  • Many thanks, Chili555. I checked, and changed REGDOMANS from 00 to US. I also did the temporary update of MTU for wlan0 to 1492. How can I make this a permanent setting on reboot? Will start monitoring dmesg for improvement in wlan0 resets – Karl May 24 '22 at 16:00
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    backport-iwlwifi-dkms (8324) is too old for your kernel on 20.04. You need to use a newer version. However, without this backport, if the wireless was recognized and working (disconnects or not), then you don't need this backport anyway. – heynnema May 24 '22 at 16:51
  • MTU=1492 is only if you have DSL. – heynnema May 25 '22 at 02:52
  • Install WiFi Analyzer on your smartphone, and see what channel usage is in your area, then check your channel setting in your router, and change to a less used channel (1, 6, 11) if necessary to get a reliable connection. – heynnema May 25 '22 at 02:54
  • Status please... – heynnema Jun 05 '22 at 20:02

2 Answers2

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Nope for kerneltree 5.4 or newer it is not building.

apt changelog backport-iwlwifi-dkms

backport-iwlwifi-dkms (8324-0ubuntu3~20.04.4) focal; urgency=medium


    

  • Disable build against kernel newer than v5.4. (LP: #1932158)
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but in the universe repo there is an older version which is building (tested it with

 dkms status
backport-iwlwifi, 8324, 5.4.0-110-generic, x86_64: installed
backport-iwlwifi, 8324, 5.4.0-113-generic, x86_64: installed

)

sudo apt install --reinstall backport-iwlwifi-dkms=8324-0ubuntu1

Note I do not know if it is fixing your disconnect problem, this is only a workaround for failing building.

nobody
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  • I did check this on my system. and I can confirm that 8324-0ubuntu1 does build under DKMS. I have to wonder why anyone would want to block it building corectly? – Karl May 24 '22 at 19:53
  • @Karl It won't build against newer kernels, without getting a newer version of backports. Edit your question and show me dkms status. – heynnema May 25 '22 at 02:57
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I had my ubuntu 20.04 installed with Kernel 5.15.0-27.29 and everything worked fine. When sudo apt-get update && sudo apt-get upgrade was given, I noticed the following error message The /var/lib/dkms/backport-iwlwifi/8324/5.15.0-56-generic/x86_64/dkms.conf for module backport-iwlwifi includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch. This indicates that it should not be built.

This time it was trying to install Kernel 5.15.0-56.62. Then, the Wi-Fi was not getting detected.

I followed the solution given in https://askubuntu.com/questions/1046589/backport-for-iwlwifi and it worked. I am just reproducing the steps.

git clone https://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/backport-iwlwifi.git
cd backport-iwlwifi
make defconfig-iwlwifi-public
sed -i 's/CPTCFG_IWLMVM_VENDOR_CMDS=y/# CPTCFG_IWLMVM_VENDOR_CMDS is not set/' .config
make -j4
sudo make install

Though it generated few errors, warnings,Wifi started working again after a reboot.

Vinu Raja Kumar C
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