Bug 15167 - Lenovo Ideapad line support in acer_wmi?
Lenovo Ideapad line support in acer_wmi?
Product: Drivers
Classification: Unclassified
Component: Platform
All Linux
: P1 enhancement
Assigned To: Carlos Corbacho
Depends on:
Blocks: 56331
  Show dependency treegraph
Reported: 2010-01-28 22:20 UTC by Michał Witkowski
Modified: 2013-04-09 06:23 UTC (History)
3 users (show)

See Also:
Kernel Version: kernel26-rc
Tree: Mainline
Regression: No

Lenovo Idepad U330 DSDT (299.71 KB, application/octet-stream)
2010-01-28 22:20 UTC, Michał Witkowski
Lenovo Ideapad U330 patch for acer_wmi (1.03 KB, patch)
2010-04-21 07:05 UTC, Michał Witkowski
Details | Diff

Description Michał Witkowski 2010-01-28 22:20:18 UTC
Created attachment 24772 [details]
Lenovo Idepad U330 DSDT


I've noticed that in kernel 2.6.33-rc5, acer_wmi started getting loaded for my Lenovo Ideapad U330 laptop. Somehow, out of the blue, it started loading and doing weird stuff to me wifi rfkill (bug 15164), which... is a good thing :)

First of all, the wifi rfkill works using acer_wmi, which gives some hope :)
Second, it seems that my Ideapad shares quite a lot of code with other Acers, namely 4810TG. I was able to turn off my Ati card and use only the Intel one in switchable graphics mode, thanks to this code made for Acer laptops: http://ubuntuforums.org/showpost.php?p=7933876&postcount=11.

I've poked around my DSDT and it seems that the AMW0 and WMI0 things are there. Under Windows, there is a separate software rfkill for WiFi and Bluetooth, but both of these are controlled by the hardware switch. It would be fantastic to be able to use the bluetooth rfkill under Linux.

Could someone, who is more familiar with all this low-level stuff, please take a look into the DSDT of my laptop and tell me if there is any faint possiblity of it being compatible with acer_wmi?

Also, the dmi stuff on my laptop is a little borked, as dmidecode reports:

Handle 0x0001, DMI type 1, 27 bytes
System Information                 
        Manufacturer: LENOVO       
        Product Name: INVALID      
        Version: Lenovo IdeaPad U330
        Serial Number: 1S168001975001MX
        UUID: 4E1237A0-8374-11DD-886A-E9467D20CD40
        Wake-up Type: Power Switch                
        SKU Number: Montevina_Fab                 
        Family: Intel_Mobile    

Strange that Version  holds the Product Name, but that's life.
Comment 1 Zhang Rui 2010-01-29 01:07:18 UTC
re-assign to Carlos.
Comment 2 Zhang Rui 2010-03-10 03:22:30 UTC
ping Carlos...
Comment 3 Zhang Rui 2010-03-25 06:17:33 UTC
ping Carlos, :p

does the problem still exist in the latest upstream kernel, say 2.6.34-rc1?
Comment 4 Michał Witkowski 2010-04-20 21:31:53 UTC
It's not that much of a problem, as I've blacklisted the module.

It's only that I think that acer_wmi could be extended to support the Ideapad line.
Comment 5 Michał Witkowski 2010-04-20 21:51:52 UTC
Ok, a bit of a success right now, which proves that acer_wmi IS the way to go. I've edited and compiled acer-wmi.c from:
 577     /*
 578      * On laptops with this strange GUID (non Acer), normal probing doesn't
 579      * work.
 580      */
 581     if (wmi_has_guid(AMW0_GUID2)) {
 582         interface->capability |= ACER_CAP_WIRELESS;
 583         return AE_OK;
 584     }

 577     /*
 578      * On laptops with this strange GUID (non Acer), normal probing doesn't
 579      * work.
 580      */
 581     if (wmi_has_guid(AMW0_GUID2)) {
 582         interface->capability |= ACER_CAP_WIRELESS | ACER_CAP_BLUETOOTH;
 583         return AE_OK;
 584     }

I only forced the bluetooth capability. And guess what! I've now got bluetooth RFKILL which WORKS!

I know it's a dirty little hack and that Lenovo Ideapad U330 support could be nicely detected, but I'm no kernel hacker and I don't (yet) know how to do it.
Comment 6 Michał Witkowski 2010-04-21 07:05:26 UTC
Created attachment 26075 [details]
Lenovo Ideapad U330 patch for acer_wmi

This patch adds the following:
1. Support for forced bluetooth from quirks
2. Bluetooth rfkill for Ideapad U330
3. Working _reading_ of wireless rfkill state. Writing worked, reading always showed 0

Please note, 3. fixes problem with wireless rfkill being off after suspend.
The DMI_MATCH part is a bit tricky, because U330 has it's identification in version not model parts of DMI.
Comment 7 Michał Witkowski 2010-04-21 10:54:57 UTC
The above patch adds the most needed functionality: rfkill. However there is one more critical feature: being able to disable/enable the camera.

I've used the acer_ec.pl [1] script to toy around. In the DSDT (attached before) I found the following:
                        Offset (0x54), 
                        CAPR,   1,   

So I did:
root@hermes:~$ ./acer_ec.pl +f 0x54 0x01
REG[0x54] == 0x60
REG[0x54] := 0x61
REG[0x54] == 0x61
to turn off the onboard camera and the following to turn it off:
root@hermes:~$ ./acer_ec.pl -f 0x54 0x01
REG[0x54] == 0x61
REG[0x54] := 0x60
REG[0x54] == 0x60

It works really really well. However, I don't know how to add an entry in the /sys interface to expose this functionality. Could someone guide me how to do it?

Moreover, I found that touchpad state is available at 0x74 with flag 0x08.

[1] http://code.google.com/p/aceracpi/wiki/EmbeddedController
Comment 8 Michał Witkowski 2010-04-26 05:58:08 UTC
Could anyone comment on the above patch?
Comment 9 Michał Witkowski 2010-05-07 14:08:00 UTC
I just asked my friend who has a Lenovo Ideapad Y550 whether or not his machine is similar. Will post later on.

Apart from that, had anyone looked into the patch yet? It's not really intrusive and I'd like it to be included in the vanilla kernel, so that other owners of Lenovo hardware can take advantage of it.
Comment 10 Carlos Corbacho 2010-05-08 09:24:38 UTC
The patch looks fine to me; though I'd prefer to work out how to do autodetection on these Lenovo's, as I don't really want to start building up a list of DMI quirks just to make these laptops work (but for this kind of WMI interface, which is just a glorified wrapper for direct BIOS calls, this non trivial - last time I did it involved fiddling with the Windows Kernel Debugger to trace ACPI).

I'm aware that the touchpad state is available from the EC, but it's not terribly useful (you can't change it, and there's nothing that can really read it or cares about it), so I don't think it's worth exposing.

The camera state is more interesting, though I'm not aware of any subsystem through which to expose that, and if it can be controlled via some other mechanism, then it may not be that useful to expose it either.
Comment 11 Lee, Chun-Yi 2011-03-29 04:48:04 UTC
Just look at Michał's DSDT, there have VPC2004 device in DSDT, that means it must support by ideapad laptop driver.

My plan is add a patch to acer-wmi to check if ther ehave VPC2004 device, then ignore it and leave it to handle by ideapad laptop driver.
Comment 12 Lee, Chun-Yi 2012-03-15 09:34:03 UTC
Please try Ike's patch on acer-wmi, it avoid acer-wmi driver generate rfkill on
Lenovo machines:

From: Ike Panhc <ike.pan@canonical.com>
Date: Fri, 3 Feb 2012 16:46:39 +0800
Subject: [PATCH] acer-wmi: No wifi rfkill on Lenovo machines

Git-commit: 461e74377cfcfc2c0d6bbdfa8fc5fbc21b052c2a
Patch-mainline: v3.3-rc8
References: bnc#745236

We have several reports which says acer-wmi is loaded on ideapads
and register rfkill for wifi which can not be unblocked.

Since ideapad-laptop also register rfkill for wifi and it works
reliably, it will be fine acer-wmi is not going to register rfkill
for wifi once VPC2004 is found.

Also put IBM0068/LEN0068 in the list. Though thinkpad_acpi has no
wifi rfkill capability, there are reports which says acer-wmi also
block wireless on Thinkpad E520/E420.

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