On Fri, 13 Dec 2019 15:29:23 +1030 Andrew Bettison <and...@iverin.com.au> wrote:
> On Sun, 08 Sep 2019 23:43:04 -0400 Celejar <cele...@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. > 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 my system, the problem last appeared on Sep. 17 (with a Debian kernel version 5.2.9-2). Since then, I have not seen any "Microcode SW" errors. I've been running 4.19.72 (self-built), 5.2.17-1, 5.3.7-1, 5.3.9 (-1, -2, -3), and 5.3.15-1 (Debian). [I examined the boot logs with: ~# journalctl -S 2019-06-01 | grep "Linux ver\|Microcode SW" ] Celejar