Created attachment 303774 [details] dmesg after wifi stopped Abstract: While using my wifi card "Intel 6235" sometimes the wifi stops working, eventually leading to a kernel panic (for example when I reload the wifi related kernel modules). Long history: Just after connecting to a network sometimes the wifi stops working. When the problem occour, the dmesg messages that I think are prominent are: "Error sending REPLY_SCAN_ABORT_CMD", "Failed to load firmware chunk!" "Hardware became unavailable during restart" One option is to restart and hope the wifi works. Other is to reload all the wifi related kernel modules: rmmod iwlwifi iwldvm mac80211 cfg80211 # I repeat to ensure all modules are unloaded # (wait some time) modprobe iwlwifi After this, sometimes the wifi works normally again, but most of the time the system starts behaving strangely, and a few seconds later the crash occurs, with the caps-lock led blinking (kernel panic). The problem occurs intermittently. Most of the time the problem occurs a few seconds after login, when KDE/networkmanager tries to connect with my AP on a cold boot. But sometimes weeks pass with the system normally (even with dozens of suspend-resume cycles). I tried a few things but couldn't come to any conclusion as to what causes the problem: 1) Different options for iwlwifi (current one is options iwlwifi bt_coex_active=0 11n_disable=8). 2) Set some kernel parameters, like "pcie_aspm=force enable_mtrr_cleanup mtrr_spare_reg_nr=1 mtrr_gran_size=64M mtrr_chunk_size=256M" 3) Activate or deactivate my "external" GPU ([AMD/ATI] Mars [Radeon HD 8670A/8670M/8750M / R7 M370]) (currently deactivated) 4) Connect to my AP's 2.4 GHz channel, instead of the 5 GHz one. I've enabled the iwlwifi debug with command below and collected the dmesg after the wifi stopped working: echo 0x7ffff > /sys/module/iwlwifi/parameters/debug Note that my report is very similar to bug 190281, but in this one I attach the dmesg of the driver with debug enabled, and in my case there is a kernel panic sometimes. I always compile my own kernel, and as far as I can remember this problem has been going on at least since kernel version 3.8.x. When the wifi works, it works great (with download and upload speeds in the 100mbps range). I know the device is old and the firmware is no longer supported. But I'm not asking for a firmware correction: being a firmware crash, I just wanted that, in case of a firmware error, it would be successfully reloaded and the wifi hardware would work again, without kernel panic. Please let me know if you need additional information. Firmware-version: 18.168.6.1 6000g2b-6.ucode.