Am 05.03.23 um 23:59 schrieb Andrew Kallmeyer:
On Sun, Mar 5, 2023 at 1:40 PM Armin Wolf <W_Armin@xxxxxx> wrote:
Hi,
could it be that bit 5 is set to disable the touchpad when the device switches
to tablet mode? I suspect that the query handler does the following:
1. Notify VPC0 to disable the touchpad.
2. Notify ACPI WMI, which does submit the necessary scancode for switching to tablet mode.
I think you're right about this notification being for the touchpad,
although at least on my machine
there is no other touchpad switch. So this is identical for my machine
specifically. In this function
from the decompiled ACPI dump you can see VCP0 and WM00 notified:
Method (_Q44, 0, NotSerialized) // _Qxx: EC Query, xx=0x00-0xFF
{
P80B = 0x44
Notify (VPC0, 0x80) // Status Change
WEID = 0xF4
Notify (WM00, 0x80) // Status Change
}
This WM00 device sounds like the WMI you're talking about, however I'm
getting those errors
about this device not existing in journalctl still. I was asking
before about how to create this
missing device but it's not clear to me if that is possible.
kernel: ACPI BIOS Error (bug): Could not resolve symbol
[\_SB.PC00.LPCB.EC0._Q44.WM00], AE_NOT_FOUND
I searched in my .dsl files from the acpidump and wasn't able to find
any of the 3 ideapad_wmi_ids
listed in the driver. Maybe you have an idea of how to interface with
this missing WM00 object though.
I was combing through the ACPI DSDT table inside the acpidump you provided,
and i found serveral PNP0C14 devices, which hold WMI methods, events and data.
The WMI GUIDs are encoded inside the associated _WDG buffers, you should therefore
only grep for parts of the GUIDs.
For example: GUID 06129D99-6083-4164-81AD-F092F9D773A6 -> grep "0xF0, 0x92"
When feeding the content of the buffers named WQxx to the bmfdec utility, i was able
to extract a description of each WMI object.
On of which (WMIY) is handling the "Lenovo Yoga Mode", which seems to handle the tablet
mode transitions. The MOF data is:
[WMI, Dynamic, Provider("WmiProv"), Locale("MS\\0x409"), Description("Lenovo Yoga Mode Change Event"), guid("{06129D99-6083-4164-81AD-F092F9D773A6}")]
class LENOVO_GSENSOR_EVENT : WMIEvent {
[key, read] string InstanceName;
[read] boolean Active;
[WmiDataId(1), read, Description("Lenovo Yoga Mode Change Event")] uint32 ModeDataVal;
};
[WMI, Dynamic, Provider("WmiProv"), Locale("MS\\0x409"), Description("LENOVO_GSENSOR_DATA class"), guid("{09B0EE6E-C3FD-4243-8DA1-7911FF80BB8C}")]
class LENOVO_GSENSOR_DATA {
[key, read] string InstanceName;
[read] boolean Active;
[WmiMethodId(1), Implemented, Description("Mode Data")] void GetUsageMode([out, Description("Mode Data")] uint32 Data);
[WmiMethodId(2), Implemented, Description("Get Xaxis Value")] void GetXaxisValue([out, Description("Get Xaxis Value")] uint32 Data);
[WmiMethodId(3), Implemented, Description("Get Yaxis Value")] void GetYaxisValue([out, Description("Get Yaxis Value")] uint32 Data);
[WmiMethodId(4), Implemented, Description("Get Zaxis Value")] void GetZaxisValue([out, Description("Get Zaxis Value")] uint32 Data);
[WmiMethodId(5), Implemented, Description("Base to Ground")] void GetAngle4Value([out, Description("Base to Ground")] uint32 Data);
[WmiMethodId(6), Implemented, Description("Screen to Ground")] void GetAngle5Value([out, Description("Screen to Ground")] uint32 Data);
[WmiMethodId(7), Implemented, Description("Screen to Base")] void GetAngle6Value([out, Description("Screen to Base")] uint32 Data);
};
While looking at _WED (used to get ModeDataVal) and WMAB (handles method calls on LENOVO_GSENSOR_DATA),
i assume that only the first method (GetUsageMode) is implemented, and that ModeDataVal is used to tell
which value of LENOVO_GSENSOR_DATA has changed (hardwired to 1 on your device).
Maybe you can write a wmi driver which handles both WMI objects, so that you can find out what the values
returned by GetUsageMode mean. With a bit of luck, you can use this to implement tablet mode toggle detection.
BTW, what is the name of your notebook model?
Armin Wolf
Could you provide the output of "acpidump"? Because i suspect that the virtual key handling
is done using ACPI WMI, as many modern devices are using this approach. In this case, you
could experiment with ideapad_wmi_notify(), and maybe take a look at ideapad_wmi_ids[].
Armin Wolf
Here is the raw acpidump output: https://la.ask.systems/temp/acpidump.out
- Andrew
