| View previous topic :: View next topic |
| Author |
Message |
Matte88
n00b
Joined: 15 Aug 2009
Posts: 61
Location: VE-NICE
|
 Posted: Mon Jan 14, 2013 5:19 pm Post subject: Accelerometer on a laptop?!? What? Where? |
 |
|
Mine is a Lenovo Essential laptop (not a tablet or convertible, a simple laptop) and today I found this | Code: | I: Bus=0019 Vendor=0000 Product=0000 Version=0000
N: Name="Acer BMA150 accelerometer"
P: Phys=wmi/input1
S: Sysfs=/devices/virtual/input/input8
U: Uniq=
H: Handlers=event8 js0
B: PROP=0
B: EV=9
B: ABS=7 |
Can anyone help me please find out this device?
_________________
-Complichiamo le cose per semplificarci la vita- |
|
| Back to top |
|
 |
eccerr0r
Watchman
Joined: 01 Jul 2004
Posts: 9895
Location: almost Mile High in the USA
|
| Posted: Mon Jan 14, 2013 5:28 pm Post subject: |
|
|
They're not completely unheard of....
Apparently you got yours configured as a joystick (/dev/input/js0). You can try getting some applications that use the joystick to see what it does...
_________________
Intel Core i7 2700K/Radeon R7 250/24GB DDR3/256GB SSD
What am I supposed watching? |
|
| Back to top |
|
|
gerard27
Advocate
Joined: 04 Jan 2004
Posts: 2377
Location: Netherlands
|
| Posted: Mon Jan 14, 2013 8:31 pm Post subject: |
|
|
Accelerometers in laptops are there to protect the hard drive in case it's dropped I think.
But I don't own one so I am not sure.
It can be found in the kernel config under "Device Drivers > Miscellaneous devices".
How to make use of it I have no idea.
Gerard.
_________________
To install Gentoo I use sysrescuecd.Based on Gentoo,has firefox to browse Gentoo docs and mc to browse (and edit) files.
The same disk can be used for 32 and 64 bit installs.
You can follow the Handbook verbatim.
http://www.sysresccd.org/Download |
|
| Back to top |
|
|
eccerr0r
Watchman
Joined: 01 Jul 2004
Posts: 9895
Location: almost Mile High in the USA
|
| Posted: Mon Jan 14, 2013 9:52 pm Post subject: |
|
|
I think mine also has some usage in determining when to turn the fan on. In multiple situations when I tip my laptop a bit, the fan will come on full speed - I suppose the firmware is assuming that if it needs power it will reduce processing speed to prevent overheating but it still has a lot of heat backed up. However if it senses the laptop being tipped, it's likely got an opening where the vents are free and it should pump out as much heat as it can (turning on fans full blast) before it gets blocked on a lap or soft material once more...
That's what I suspect at least.
But yes, hdd protection is another good use for it. It unfortunately isn't very useful in my laptop now (SSD's don't need to be parked...)
_________________
Intel Core i7 2700K/Radeon R7 250/24GB DDR3/256GB SSD
What am I supposed watching? |
|
| Back to top |
|
|
Matte88
n00b
Joined: 15 Aug 2009
Posts: 61
Location: VE-NICE
|
| Posted: Tue Jan 15, 2013 1:44 am Post subject: |
|
|
Tipping my laptop and nothing happened... I can't understand to which device/hw-part/button is related the accelerometer.
The docs about my model doesn't talk about HDD protection (is an entry-level laptop), so this input device remains unknown... ?... 
[EDIT]
Strange behaviour... Look at this | Code: | laptoo ~ # cat /dev/input/mouse0
▒�▒�▒�(�8��8��8��8��8��8��8��8��▒�▒�(�▒�▒(�(�(�(��▒�▒�^C
laptoo ~ # cat /dev/input/mouse1
c^C
laptoo ~ # cat /dev/input/js0
cat: /dev/input/js0: Operazione non permessa |
With mouse0 you can see input, mouse1 shows no activity and js0 gives Operation not permitted... | Code: | I: Bus=0003 Vendor=046d Product=c05a Version=0111
N: Name="Logitech USB Optical Mouse"
P: Phys=usb-0000:00:1a.0-1.3/input0
S: Sysfs=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3/1-1.3:1.0/input/input6
U: Uniq=
H: Handlers=mouse0 event6
B: PROP=0
B: EV=17
B: KEY=ff0000 0 0 0 0
B: REL=143
B: MSC=10
I: Bus=0019 Vendor=0000 Product=0000 Version=0000
N: Name="Acer BMA150 accelerometer"
P: Phys=wmi/input1
S: Sysfs=/devices/virtual/input/input9
U: Uniq=
H: Handlers=event9 js0
B: PROP=0
B: EV=9
B: ABS=7
I: Bus=0011 Vendor=0002 Product=000e Version=0000
N: Name="ETPS/2 Elantech Touchpad"
P: Phys=isa0060/serio1/input0
S: Sysfs=/devices/platform/i8042/serio1/input/input10
U: Uniq=
H: Handlers=mouse1 event10
B: PROP=1
B: EV=b
B: KEY=6420 30000 0 0 0 0
B: ABS=260800011000003 |
| Code: | crw-r--r-- 1 root root 13, 0 15 gen 02.46 js0
crw-r----- 1 root root 13, 32 15 gen 02.46 mouse0
crw-r----- 1 root root 13, 33 15 gen 02.46 mouse1 |
[/EDIT]
_________________
-Complichiamo le cose per semplificarci la vita- |
|
| Back to top |
|
|
_______0
Guru
Joined: 15 Oct 2012
Posts: 521
|
| Posted: Tue Jan 15, 2013 2:11 am Post subject: |
|
|
1
2 give it a lappy dance
3
4 FUN!!
thinkpads are known to use gyros for their hdds.
http://www.thinkwiki.org/wiki/HDAPS
thread solved. |
|
| Back to top |
|
|
Matte88
n00b
Joined: 15 Aug 2009
Posts: 61
Location: VE-NICE
|
| Posted: Tue Jan 15, 2013 2:38 pm Post subject: |
|
|
| Code: | $ jstest /dev/input/js0
jstest: Operation not permitted |
| Code: | $ su -c 'jstest /dev/input/js0'
Password:
jstest: Operation not permitted |
_________________
-Complichiamo le cose per semplificarci la vita- |
|
| Back to top |
|
|
ppurka
Advocate
Joined: 26 Dec 2004
Posts: 3256
|
| Posted: Tue Jan 15, 2013 2:53 pm Post subject: |
|
|
Don't know about your laptop, but for thinkpads there used to be a program called hdapsd, along with a corresponding module(?) in tp-smapi. One would run it as a daemon - it would read the accelerometer data and it would park the hard drive head whenever there was a sudden motion of the laptop. Before my thinkpad broke down, I used hdaps and it used to work.
_________________
emerge --quiet redefined | E17 vids: I, II | Now using kde5 | e is unstable :-/ |
|
| Back to top |
|
|
vcunat
n00b
Joined: 03 Feb 2013
Posts: 1
|
| Posted: Sun Feb 03, 2013 10:20 am Post subject: Travelmate? |
|
|
| I just found the same device on my Acer TravelMate 5742. For ThinkPads I wouldn't be so surprised, but this is a rather lower-end machine. It seems strange, I've found no reference about accelerometers in this line of machines, neither in the acer_wmi.c file. |
|
| Back to top |
|
|
|
Kernel & Hardware
