On Mon, 2018-04-23 at 15:05 +0300, Mika Westerberg wrote:
> Hi,
Hi Mika,
> On my Lenovo X1 Carbon gen 5 system,after I upgraded to v4.17-rc1
> iwlwifi started to fail with following splats on dmesg:
>
> iwlwifi 0000:04:00.0: Microcode SW error detected. Restarting
> 0x2000000.
> iwlwifi 0000:04:00.0: Start IWL Error Log Dump:
> iwlwifi 0000:04:00.0: Status: 0x00000100, count: 6
> iwlwifi 0000:04:00.0: Loaded firmware version: 31.560484.0
> iwlwifi 0000:04:00.0: 0x00000038 | BAD_COMMAND
[...]
> The controller in question is:
>
> 04:00.0 Network controller [0280]: Intel Corporation Wireless 8265
> / 8275 [8086:24fd] (rev 88)
>
> Bisection pointed to the following commit and after I reverted it,
> things seem to work fine again:
>
> 66fa2424df16 ("iwlwifi: fw api: support the new scan request FW API
> version")
>
> Any idea what might be wrong with that commit and how to fix it
> properly?
We had a bug in the scan command size for older firmwares. I have
already made a fix for it, but I hadn't sent it out for upstream yet.
I'll send it out now and soon send you a link to it in patchwork.
You have two options: recompile the kernel with my patch or; use the
latest version of the firmware from linux-firmware.git[1].
I recommend upgrading the firmware, because we have a lot of other
fixes and improvements there, but if you want to keep your distro's
original firmware package, you can apply my patch instead.
HTH and thanks for reporting!
[1] https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/iwlwifi-8265-36.ucode
--
Cheers,
Luca.
