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On Sun, 2016-12-11 at 00:37 +0000, marmuta wrote:
> Came across SW_TABLET_MODE in the kernel. There are a bunch of drivers that
> send this, one of them thinkpad_acpi.c. Are you by chance able to load that
> kernel module (according to the documentation probably not)? 
> $ sudo modprobe thinkpad_acpi
> 


Wow. I wasn't aware they added support for Lenovo Yogas into this driver.
Initially (maybe more than a year ago), this driver wouldn't have any effect on
Yoga. Now its different.

[ 9988.198752] Non-volatile memory driver v1.3
[ 9988.201892] thinkpad_acpi: ThinkPad ACPI Extras v0.25
[ 9988.201894] thinkpad_acpi: http://ibm-acpi.sf.net/
[ 9988.201895] thinkpad_acpi: ThinkPad BIOS 96CN31WW(V1.17), EC unknown
[ 9988.201897] thinkpad_acpi: Lenovo Lenovo Yoga 2 13, model 20344
[ 9988.281520] thinkpad_acpi: Standard ACPI backlight interface available, not
loading native one
[ 9988.281759] thinkpad_acpi: Console audio control enabled, mode: monitor (read
only)
[ 9988.282273] input: ThinkPad Extra Buttons as
/devices/platform/thinkpad_acpi/input/input18
2016-12-11 / 16:05:39 ♒♒♒  ☺  


> This creates a flag in 
> /sys/devices/platform/thinkpad_acpi/hotkey_tablet_mode
> that could be queried, and also sends sysfs events (for udev I guess) and
> hotkey events through evdev when the mode changes.
> 


That isn't available. So I got you the following.

rrs@learner:~/rrs-home/Community/linux-upstream_GIT (broken-mmc)$ tree
/sys/devices/platform/thinkpad_acpi/
/sys/devices/platform/thinkpad_acpi/
├── cmos_command
├── driver -> ../../../bus/platform/drivers/thinkpad_acpi
├── driver_override
├── input
│   └── input19
│       ├── capabilities
│       │   ├── abs
│       │   ├── ev
│       │   ├── ff
│       │   ├── key
│       │   ├── led
│       │   ├── msc
│       │   ├── rel
│       │   ├── snd
│       │   └── sw
│       ├── device -> ../../../thinkpad_acpi
│       ├── event16
│       │   ├── dev
│       │   ├── device -> ../../input19
│       │   ├── power
│       │   │   ├── async
│       │   │   ├── autosuspend_delay_ms
│       │   │   ├── control
│       │   │   ├── runtime_active_kids
│       │   │   ├── runtime_active_time
│       │   │   ├── runtime_enabled
│       │   │   ├── runtime_status
│       │   │   ├── runtime_suspended_time
│       │   │   └── runtime_usage
│       │   ├── subsystem -> ../../../../../../class/input
│       │   └── uevent
│       ├── id
│       │   ├── bustype
│       │   ├── product
│       │   ├── vendor
│       │   └── version
│       ├── modalias
│       ├── name
│       ├── phys
│       ├── power
│       │   ├── async
│       │   ├── autosuspend_delay_ms
│       │   ├── control
│       │   ├── runtime_active_kids
│       │   ├── runtime_active_time
│       │   ├── runtime_enabled
│       │   ├── runtime_status
│       │   ├── runtime_suspended_time
│       │   └── runtime_usage
│       ├── properties
│       ├── subsystem -> ../../../../../class/input
│       ├── uevent
│       └── uniq
├── modalias
├── power
│   ├── async
│   ├── autosuspend_delay_ms
│   ├── control
│   ├── runtime_active_kids
│   ├── runtime_active_time
│   ├── runtime_enabled
│   ├── runtime_status
│   ├── runtime_suspended_time
│   └── runtime_usage
├── sound
│   └── card29
│       ├── controlC29
│       │   ├── dev
│       │   ├── device -> ../../card29
│       │   ├── power
│       │   │   ├── async
│       │   │   ├── autosuspend_delay_ms
│       │   │   ├── control
│       │   │   ├── runtime_active_kids
│       │   │   ├── runtime_active_time
│       │   │   ├── runtime_enabled
│       │   │   ├── runtime_status
│       │   │   ├── runtime_suspended_time
│       │   │   └── runtime_usage
│       │   ├── subsystem -> ../../../../../../class/sound
│       │   └── uevent
│       ├── device -> ../../../thinkpad_acpi
│       ├── id
│       ├── number
│       ├── power
│       │   ├── async
│       │   ├── autosuspend_delay_ms
│       │   ├── control
│       │   ├── runtime_active_kids
│       │   ├── runtime_active_time
│       │   ├── runtime_enabled
│       │   ├── runtime_status
│       │   ├── runtime_suspended_time
│       │   └── runtime_usage
│       ├── subsystem -> ../../../../../class/sound
│       └── uevent
├── subsystem -> ../../../bus/platform
└── uevent

23 directories, 75 files
2016-12-11 / 16:13:43 ♒♒♒  ☺  


rrs@learner:~/rrs-home/Community/linux-upstream_GIT (broken-mmc)$ for item
in  /sys/devices/platform/thinkpad_acpi/input/input19/capabilities/*; do echo
$item; cat $item; done
/sys/devices/platform/thinkpad_acpi/input/input19/capabilities/abs
0
/sys/devices/platform/thinkpad_acpi/input/input19/capabilities/ev
1
/sys/devices/platform/thinkpad_acpi/input/input19/capabilities/ff
0
/sys/devices/platform/thinkpad_acpi/input/input19/capabilities/key
0
/sys/devices/platform/thinkpad_acpi/input/input19/capabilities/led
0
/sys/devices/platform/thinkpad_acpi/input/input19/capabilities/msc
0
/sys/devices/platform/thinkpad_acpi/input/input19/capabilities/rel
0
/sys/devices/platform/thinkpad_acpi/input/input19/capabilities/snd
0
/sys/devices/platform/thinkpad_acpi/input/input19/capabilities/sw
0
2016-12-11 / 16:14:51 ♒♒♒  ☺  

rrs@learner:~/rrs-home/Community/linux-upstream_GIT (broken-mmc)$ cat
/proc/acpi/button/lid/LID0/state 
state:      open
2016-12-11 / 16:10:08 ♒♒♒  ☺  


But the touchscreen is lost now, so I can't give you what the status is in
tablet mode. Let me figure out if the touchscreen loss was because of the
thinkpad_acpi driver.

xinput looks okay, even after touchscreen loss.

rrs@learner:~/rrs-home/Community/linux-upstream_GIT (broken-mmc)$ xinput list⎡
Virtual core pointer                    	id=2	[master
pointer  (3)]
⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointe
r  (2)]
⎜   ↳ ELAN Touchscreen                        	id=9	[slave  pointe
r  (2)]
⎜   ↳ SynPS/2 Synaptics TouchPad              	id=13	[slave  point
er  (2)]
⎣ Virtual core keyboard                   	id=3	[master keyboard
(2)]
    ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboa
rd (3)]
    ↳ Power Button                            	id=6	[slave  keyboa
rd (3)]
    ↳ Video Bus                               	id=7	[slave  keyboa
rd (3)]
    ↳ Power Button                            	id=8	[slave  keyboa
rd (3)]
    ↳ Lenovo EasyCamera                       	id=10	[slave  keybo
ard (3)]
    ↳ Ideapad extra buttons                   	id=11	[slave  keybo
ard (3)]
    ↳ AT Translated Set 2 keyboard            	id=12	[slave  keybo
ard (3)]
2016-12-11 / 16:11:25 ♒♒♒  ☺  

> > From the source:
> 
> 	TP_HKEY_EV_TABLET_TABLET	= 0x5009, /* tablet swivel up */
> 	TP_HKEY_EV_TABLET_NOTEBOOK	= 0x500a, /* tablet swivel down */
> 


So though the driver (thinkpad_acpi) loaded, it still doesn't seem to be meant
for Yoga series.

- -- 
Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."
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