Re: ACPI defined devices not showing up under /sys/bus/platform/devices

[Marcos Paulo de souza <marcos.souza.org@gmail.com>]

Hi,

On 09/19/2014 05:47 AM, Mika Westerberg wrote:
> On Thu, Sep 18, 2014 at 06:02:40PM -0300, Marcos Paulo de souza wrote:
>> Hi,
>>
>> On 09/18/2014 05:49 PM, Hans de Goede wrote:
>>> Hi,
>>>
>>> On 09/18/2014 04:01 PM, Mika Westerberg wrote:
>>>> On Thu, Sep 18, 2014 at 02:04:11PM +0200, Hans de Goede wrote:
>>>>> Hi,
>>>>>
>>>>> I'm trying to help various users with Asus X450 and Asus X550 laptops
>>>>> to get their touchpad to work:
>>>>>
>>>>> https://bugzilla.redhat.com/show_bug.cgi?id=1110011
>>>>>
>>>>> We believe that this touchpad is connected over i2c, using the
>>>>> i2c-designware-platform driver.
>>>>>
>>>>> If you look at the DSDT attached there you can clearly see
>>>>> nodes defines which should lead to e.g. :
>>>>>
>>>>> /sys/bus/platform/devices/INT33C2:00
>>>>>
>>>>> Showing up (which should then be bound by i2c-designware-platform).
>>>>>
>>>>> But nothing is showing up, not a single ACPI defined device shows
>>>>> up actually:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> [root@asusx550 devices]# ll
>>>>> insgesamt 0
>>>>> lrwxrwxrwx. 1 root root 0 22. Jul 14:56 alarmtimer -> ../../../devices/platform/alarmtimer
>>>>> lrwxrwxrwx. 1 root root 0 25. Jul 23:54 asus-nb-wmi -> ../../../devices/platform/asus-nb-wmi
>>>>> lrwxrwxrwx. 1 root root 0 25. Jul 23:54 coretemp.0 -> ../../../devices/platform/coretemp.0
>>>>> lrwxrwxrwx. 1 root root 0 22. Jul 14:56 efi-framebuffer.0 -> ../../../devices/platform/efi-framebuffer.0
>>>>> lrwxrwxrwx. 1 root root 0 22. Jul 14:56 Fixed MDIO bus.0 -> ../../../devices/platform/Fixed MDIO bus.0
>>>>> lrwxrwxrwx. 1 root root 0 22. Jul 14:56 i8042 -> ../../../devices/platform/i8042
>>>>> lrwxrwxrwx. 1 root root 0 25. Jul 23:54 iTCO_wdt -> ../../../devices/pci0000:00/0000:00:1f.0/iTCO_wdt
>>>>> lrwxrwxrwx. 1 root root 0 25. Jul 23:54 microcode -> ../../../devices/platform/microcode
>>>>> lrwxrwxrwx. 1 root root 0 22. Jul 14:56 pcspkr -> ../../../devices/platform/pcspkr
>>>>> lrwxrwxrwx. 1 root root 0 25. Jul 23:54 regulatory.0 -> ../../../devices/platform/regulatory.0
>>>>> lrwxrwxrwx. 1 root root 0 25. Jul 23:54 rtsx_pci_ms.0 -> ../../../devices/pci0000:00/0000:00:1c.2/0000:02:00.0/rtsx_pci_ms.0
>>>>> lrwxrwxrwx. 1 root root 0 25. Jul 23:54 rtsx_pci_sdmmc.0 -> ../../../devices/pci0000:00/0000:00:1c.2/0000:02:00.0/rtsx_pci_sdmmc.0
>>>>> lrwxrwxrwx. 1 root root 0 22. Jul 14:56 serial8250 -> ../../../devices/platform/serial8250
>>>>>
>>>>>
>>>>> Which is weird, since any recent machine usually has at least one or 2
>>>>> show up.
>>>> It depends whether the BIOS has enabled those or not.
>>>>
>>>> If
>>>>
>>>>   # cat /sys/bus/acpi/devices/INT33C2:00/status
>>>>   # cat /sys/bus/acpi/devices/INT33C3:00/status
>>>>
>>>> returns 0xf, then the device should be there, otherwise it is not.
>>> Interesting. Marcos, can you give this a try please ?
>> Hans, both here returned 0. As I said to you, I'm using Fedora in insecure
>> mode (I don't know if this changes anything).
> That just means that your BIOS has disabled these devices. Unless there
> is a menu somewhere in BIOS setup to enable these, there is nothing we
> can do in the kernel to make them appear.
Interesting. This machine came with Windows 8, and removed. The touchpad 
was working on Windows. Mika, I verified my BIOS configurations and 
there isn't any configuration to enable PCI devices. Do you beleive 
there is something about secure boot? As it worked with Windows, hwo can 
it be detected on Linux?
>
>>>> The "status" refers directly shat _STA() ACPI method returns.
>>> Ok, so assuming that Marcos' testing shows it is not enabled,
>>> is there anything we can, could there be some ACPI call to
>>> enable these devs ?
>>>
>>>> Note that the device could also be in PCI mode, in case lspci should
>>>> show it.
>>> Right, it does not show in lspci.
> OK. So I think that this particular machine, either does not have Intel
> LPSS (it is not Haswell-LP) or the devices have been deliberately
> disabled for some reason.
How can I verify this?