Bug#934781: firmware-iwlwifi: iwl4965: Microcode SW error detected
As an experiment, I downloaded the tarball from
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tag/?h=20190815
(as recommended in
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=939262 ), and manually
copied its intel/* and iwlwifi-* files into /lib/firmware (overwriting
the ones installed by the firmware-iwlwifi package).
After rebooting kernel 5.3.0-2 (amd64) I still get "iwlwifi: Microcode
SW error" messages accompanied by "ieee80211 phy0: Hardware restart was
requested" during periods of high Wi-Fi throughput, but they do not
cause the Wi-Fi to hang. So the newer firmware appears to rectify the
worst part of the problem (Wi-Fi freeze) but does not fully resolve the
problem.
On Sun, 08 Sep 2019 23:43:04 -0400 Celejar <celejar@gmail.com> wrote:
> Package: firmware-iwlwifi
> Version: 20190717-2
> Followup-For: Bug #934781
>
> I did some further digging - in my case, at least, the problem seems to
> be triggered by some relatively recent kernel change. I combed through
> the system journal for the last few months, and the problem first starts
> appearing in the logs a few days after I began running kernel 5.2.x
> (from 5.2.7 through 5.2.9). Previously, while running 4.19.x, the
> problem never appears.
>
> I haven't done a bisection, but it seems pretty clear at this point that
> there's a microcode bug that has begun to be triggered by something in
> newer kernels.
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