Created attachment 279967 [details]
Tried this with 8000C-36 and 8000C-34. Card is 8260 rev 2a (8086:24f3)
I'm looking at a continuously crash under kernel >= 4.19.6 while having iwlwifi enabled. Downgrading to 4.19.2 will stop this and works smoothly.
Restarts are constant, network does not connect and neither bluetooth
As attached is partial dmesg and output from `lcpci -nnk`.
Created attachment 279969 [details]
can you please try to revert c74c926 ?
Alternatively, could you try to capture trace-cmd logs while reloading the driver with fw_restart=0?
To run trace-cmd:
...and reload the module with:
sudo modprobe -r iwlmvm
sudo modprobe iwlwifi fw_restart=0
This will allow us to see what the SAR ACPI tables look like in your machine.
Sorry, that wasn't clear enough. If you run trace-cmd and then reload the modules, it won't work.
Maybe the easiest is to just run trace-cmd for some seconds while the continuous FW restarts are happening.
We found the issue and will provide a fix ASAP.
Was about to fire up the kernel version in question — That means I won’t have to provide a trace and can wait for patch, right?
Right, you don't need to provide this information anymore. We used to have a bug that was causing this command not to be sent at all. This commit fixed that:
Author: Matt Chen <email@example.com>
AuthorDate: Fri Aug 3 14:29:20 2018 +0800
Commit: Greg Kroah-Hartman <firstname.lastname@example.org>
CommitDate: Sat Dec 1 09:37:26 2018 +0100
iwlwifi: fix wrong WGDS_WIFI_DATA_SIZE
But we now realized that there are some firmware/NIC versions that don't support it, which is the case of your system.
So we need to figure out how to reliably detect if the FW supports it or not, because we didn't implement the marker (Capabilities TLV) which we usually us for this kind of stuff...
If you can upgrade your firmware to the latest version it may start working for you, though I haven't checked if that version really supports this command...
Created attachment 279993 [details]
please check the patch.
After applying this patch, recompiling iwlmvm.ko and placing it under /lib/modules/`uname -a`/extra then reboot to use it, `iwlwifi` no longer crashes.
The patch that fixes this has been sent upstream for 4.20 and it should reach it soon. Then it will be backported to 4.19.