linux-kernel - RE: dell-smbios makes wireless card unusable on Dell XPS 13 9360

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Message-ID: <675694ab854f40548d57d7943cb4475f@ausx13mpc120.AMER.DELL.COM>
Date:   Tue, 6 Feb 2018 19:51:41 +0000
From:   <Mario.Limonciello@...l.com>
To:     <pmenzel+platform-driver-x86@...gen.mpg.de>
CC:     <pali.rohar@...il.com>, <it+platform-driver-x86@...gen.mpg.de>,
        <platform-driver-x86@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: RE: dell-smbios makes wireless card unusable on Dell XPS 13 9360

> -----Original Message-----
> From: platform-driver-x86-owner@...r.kernel.org [mailto:platform-driver-x86-
> owner@...r.kernel.org] On Behalf Of Paul Menzel
> Sent: Tuesday, February 6, 2018 10:08 AM
> To: Limonciello, Mario <Mario_Limonciello@...l.com>
> Cc: Pali Rohár <pali.rohar@...il.com>; it+platform-driver-x86@...gen.mpg.de;
> platform-driver-x86@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: dell-smbios makes wireless card unusable on Dell XPS 13 9360
> 
> Dear Mario,
> 
> 
> On 02/06/18 16:58, Mario.Limonciello@...l.com wrote:
> 
> >> -----Original Message-----
> >> From: Paul Menzel [mailto:pmenzel+platform-driver-x86@...gen.mpg.de]
> >> Sent: Tuesday, February 6, 2018 9:50 AM
> >> To: Pali Rohár <pali.rohar@...il.com>; Limonciello, Mario
> >> <Mario_Limonciello@...l.com>; it+platform-driver-x86@...gen.mpg.de
> >> Cc: platform-driver-x86@...r.kernel.org; Linux Kernel Mailing List <linux-
> >> kernel@...r.kernel.org>
> >> Subject: dell-smbios makes wireless card unusable on Dell XPS 13 9360
> 
> >> Adding `dell-smbios` to `/etc/modules` on the Dell XPS 13 9360, it seems
> >> to badly effect the Wireless LAN device, causing it to be absent or to
> >> not work.
> >>
> >> In one case, the whole system lagged, that means, the log in screen
> >> stayed grayed out for 15 seconds, and the mouse pointer stopped moving
> >> every 20(?) seconds for some seconds.
> >
> > Can you please confirm if you're indicating this is a regression in 4.15?
> > Or was this present in earlier kernels too?
> 
> Yes, it happened with Ubuntu’s 4.13 too. My original message had one log
> attached where the Wifi wasn’t visible at all.
> 

Looking at that log it looks to me that the ath10k firmware crashed, not that
dell-smbios lagging caused the crash.

[   15.262226] ath10k_pci 0000:3a:00.0: firmware crashed! (uuid a6c40788-b7ad-4f6a-890a-62e62c1f6e5f)
[   15.262233] ath10k_pci 0000:3a:00.0: qca6174 hw3.2 target 0x05030000 chip_id 0x00340aff sub 1a56:1535
[   15.262235] ath10k_pci 0000:3a:00.0: kconfig debug 0 debugfs 1 tracing 1 dfs 0 testmode 0
[   15.262645] ath10k_pci 0000:3a:00.0: firmware ver WLAN.RM.4.4-00022-QCARMSWPZ-2 api 6 features wowlan,ignore-otp crc32 4d458559
[   15.262941] ath10k_pci 0000:3a:00.0: board_file api 2 bmi_id N/A crc32 0e26ef70
[   15.262943] ath10k_pci 0000:3a:00.0: htt-ver 0.0 wmi-op 4 htt-op 3 cal otp max-sta 32 raw 0 hwcrypto 1
[   15.274887] ath10k_pci 0000:3a:00.0: failed to get memcpy hi address for firmware address 4: -16
[   15.274900] ath10k_pci 0000:3a:00.0: failed to read firmware dump area: -16
[   15.274909] ath10k_pci 0000:3a:00.0: Copy Engine register dump:

Do you have a strong correlation with dell-smbios loading and the wireless
firmware crashing?  You're the first account I've heard of this.

Also why are you putting it in /etc/modules rather than letting the udev
rules load from modaliases?  Or did you artificially prevent that in some way?