linux-kernel - Dell Latitude E6510: `dell_wmi: Dell descriptor buffer has invalid buffer length (128)`

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Date:   Thu, 16 Feb 2017 16:15:08 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Matthew Garrett <mjg59@...f.ucam.org>,
        Pali Rohár <pali.rohar@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Dell Latitude E6510: `dell_wmi: Dell descriptor buffer has invalid
 buffer length (128)`

Dear Matthews, dear Pali,


Installing Debian 9 (Stretch/testing) with Linux 4.9.6 on the Dell 
Latitude E6510, the warnings below are shown.

```
$ more /proc/version
Linux version 4.9.0-1-amd64 (debian-kernel@...ts.debian.org) (gcc 
version 6.3.0 20170124 (Debian 6.3.0-5) ) #1 SMP Debian 4.9.6-3 (2017-01-28)
$ sudo journalctl -k
[…]
Feb 16 12:19:13 e6510 kernel: DMI: Dell Inc. Latitude E6510/XXXXX, BIOS 
A03 05/28/2010
[…]
Feb 16 12:19:14 e6510 kernel: input: HDA Intel MID HDMI/DP,pcm=7 as 
/devices/pci0000:00/0000:00:1b.0/sound/card0/input16
Feb 16 12:19:14 e6510 kernel: input: HDA Intel MID HDMI/DP,pcm=8 as 
/devices/pci0000:00/0000:00:1b.0/sound/card0/input17
Feb 16 12:19:14 e6510 kernel: ppdev: user-space parallel port driver
Feb 16 12:19:14 e6510 kernel: fbcon: inteldrmfb (fb0) is primary device
Feb 16 12:19:15 e6510 kernel: logitech-djreceiver 0003:046D:C52B.0003: 
hiddev0,hidraw0: USB HID v1.11 Device [Logitech USB Receiver] on 
usb-0000:00:1d.0-1.3/input2
Feb 16 12:19:15 e6510 kernel: dell_wmi: Dell descriptor buffer has 
invalid buffer length (128)
Feb 16 12:19:15 e6510 kernel: dell_wmi: Detected Dell WMI interface 
version 1
Feb 16 12:19:15 e6510 kernel: input: Dell WMI hotkeys as 
/devices/virtual/input/input18
Feb 16 12:19:15 e6510 kernel: pcmcia_socket pcmcia_socket0: cs: memory 
probe 0x0c0000-0x0fffff:
Feb 16 12:19:15 e6510 kernel:  excluding 0xc0000-0xfffff
Feb 16 12:19:15 e6510 kernel: pcmcia_socket pcmcia_socket0: cs: memory 
probe 0xa0000000-0xa0ffffff:
Feb 16 12:19:15 e6510 kernel:  excluding 0xa0000000-0xa0ffffff
Feb 16 12:19:15 e6510 kernel: pcmcia_socket pcmcia_socket0: cs: memory 
probe 0x60000000-0x60ffffff:
Feb 16 12:19:15 e6510 kernel:  excluding 0x60000000-0x60ffffff
Feb 16 12:19:15 e6510 kernel: clocksource: Switched to clocksource tsc
[…]
```

Reading the commit description [1], it sounds like, that this model just 
has a ACPI DSDT table, that wasn’t known when writing the patch [1].

It’d be great to get rid of the warning. Please tell me what you need.


Kind regards,

Paul


[1] https://patchwork.kernel.org/patch/7951281/