On Tue, 2018-01-30 at 20:49 +0100, Pali Rohár wrote: > Hello, Hi Pali,
> for almost 3 years I have a problem with Intel wifi card Centrino > Advanced-N 6235. Its firmware periodically crash and in dmesg I'm > seeing > a message "Microcode SW error detected". > > Problem happens independently of kernel versions (I tried 3.8, 3.13, > 3.18, 4.0, 4.9). Currently I'm using Debian Stretch and its 4.9 > version. > > This wifi card is identified as: > > $ lspci -s 03:00.0 -vv > 03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6235 (rev > 24) > Subsystem: Intel Corporation Centrino Advanced-N 6235 AGN [...] > And here is example of dmesg error flood: > > [26624.998823] iwlwifi 0000:03:00.0: Microcode SW error detected. Restarting > 0x2000000. [...] > [26624.999013] iwlwifi 0000:03:00.0: Loaded firmware version: 22.214.171.124 > [26624.999117] iwlwifi 0000:03:00.0: Start IWL Error Log Dump: > [26624.999118] iwlwifi 0000:03:00.0: Status: 0x000002CC, count: 6 > [26624.999120] iwlwifi 0000:03:00.0: 0x000028AA | ADVANCED_SYSASSERT > [27464.823779] iwlwifi 0000:03:00.0: Loaded firmware version: 126.96.36.199 > [27464.823903] iwlwifi 0000:03:00.0: Start IWL Error Log Dump: > [27464.823904] iwlwifi 0000:03:00.0: Status: 0x000002CC, count: 6 > [27464.823906] iwlwifi 0000:03:00.0: 0x000028AA | ADVANCED_SYSASSERT [...] > This really looks like firmware problem. What can I do with these > microcode errors? Can you help me? Yes, this is a firmware problem. But unfortunately this is a really old hardware (6 years old) and we don't support the firmware anymore. I'm sorry, but there is really nothing we can do. I hope the driver manages to recover properly and WiFi continues to work on your machine without much disturbance when this happens. -- Cheers, Luca.