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This is the development page for the Toshiba Laptop ACPI Extras driver for Linux, which provides access to custom methods of the ToshibaAcpi through the system proc directory. It is for certain newer (2001 and later) Toshiba laptops, such as the ToshibaLibretto.

New [plans for toshiba_acpi] have been announced.

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Please note: This driver is only intended to provide the extra support for ACPI functionality specific to Toshiba laptops. In other words, this driver is not intended to cover standard ACPI functions such as shutdown, reboot, suspend, hibernate, battery info, etc. Such generic functions are being supported by the ACPI4Linux project [1][2] and the Software Suspend 2 project [3]

Another important note: This driver does not work on all Toshiba laptops, particularly those models which seem to have a BIOS or other firmware which was not developed by Toshiba itself. New reverse engineering work will have to be done on these machines, or Toshiba will have to disclose the necessary details. (For support of machines with Phoenx BIOS, try the [Omnibook driver].) The error you will see in this case is:

The information on this page is only applicable to the latest version of the driver.

Install and Configure

If you can already load the 'toshiba_acpi' kernel module, you may skip this section.

If you have a 2.6 kernel, or a relatively recent 2.4 kernel (version 2.4.22 or newer), the driver is already included with the kernel source. Skip to 'Configure the kernel'.

Patch the kernel - If you have an older 2.4 kernel, or want to apply one of the experimental patches that are available on occassion, you'll have to apply a patch to the kernel source and compile it. [Download patches]

Assuming you have downloaded and unpacked the kernel source, enter the top directory and apply the patch with:

patch -p1 < some_patch_file

Configure the kernel - For a 2.6 series kernel, you'll find the driver located at:

Power management options / ACPI Support / Toshiba Laptop Extras

For a 2.4 series kernel, it's at:

General setup / Power Management support / ACPI support / ACPI Bus Manager / Toshiba Laptop Extras

Note that toshiba_acpi (needed for /proc/toshiba) doesn't seem to work with 2.6.12 kernels, but works again with 2.6.13 kernels as long as the generic hotkey driver is disabled.

Driver Use

If all is well, the directory toshiba should appear under /proc/acpi. Within that, proc files exist for examining and changing the state of various devices. Generally any user may view the state, but changing state requires root privilege.

As an example, let's look at the LCD device status (lines that start with $ are entered by the user, the other lines are output):

Now let's change the LCD brightness:

If doing this manually doesn't seem like much fun, there are a few programs that will monitor hotkeys and perform the approprite action:

[hotkey daemon example] - from driver author

Reference

Here are details about the various proc files:

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lcd - Brightness can be viewed and set with field brightness. Valid range is [0.brightness_levels-1]. Note that level 0 is not 'off'.

video - The LCD/CRT/TV video switch may be controlled with three fields lcd_out, crt_out, and tv_out. Each output may be toggled independently. To set more than one at the same time, separate the expressions with a semicolon. For example:

Note that changing the video output while an X display is active may have strange results. Switching to the text console and back to X seems to correct this.

Note that some machines do not have a TV output.

For those having trouble with this function, see ToshibaAcpiVideo.

fan - The fan state is shown with the read-only field running. A read-write field, force_on, allows you to enable the fan manually. Valid values are [0, 1]. (NOTE: If the general ACPI fan driver should one day improve to support the same functionality, this interface will be removed.)

keys - Hotkey events are queued, and a synchronous interface is provided to this queue. In the field hotkey_ready, a value of 1 indicates that there is at least one hotkey value available in the queue, and the head value can be read from the hotkey field. (For details about hotkey event codes, see Jonathan Buzzard's Toshiba HCI document [4].) Writing a value of 0 to hotkey_ready then advances the queue. Since only one consumer is supported, a user-space hotkey server would be needed to fan the queue output to multiple applications. During the consumer's init, the queue should be flushed by writing a 0 to hotkey_ready until a 0 value is read back.

version - Version information is available from two fields, driver and proc_interface. The proc interface version is important to allow user-space programs to handle multiple versions of the driver. The version will be incremented whenever a new driver release contains an incompatible change to the proc interface. Note that a change in the order of keys within a file, or an addition of new keys or files, is not considered an incompatible change.

Contributing

Please send bug fixes and ports to other kernel versions to <toshiba_acpi@memebeam.org>. Also, anyone is welcome to improve the documentation by editing this page. Adding questions is also helpful.

Questions

There is a patch to support the built-in bluetooth module in some of the Toshiba Laptops [5]. The patch exists for some time and it seems to be working. To find that specif patch was quite a hassle. My Question is now why isn't that patch incorporated in the ToshibaAcpiDriver. Are there any qualitiy problems with the code. What must be done to get it into the mainstream kernel?

See mention of bluetooth in Feature Poll section directly below, and ExperimentalToshibaAcpiDriver which allows use of the toshset utility. (Using the wiki is not a good way to ask questions-- this section will be deleted.)

Feature Poll

Vote for one of the following new features (or add a new one) by editing this page and incrementing the appropriate count. Yes, you're on your honor.

(4 vote) WWAN rfkill support. A patch which mostly works can be found [here] and was posted in [this] (german) Ubuntu forum.
(9 votes) mute button support (This feature request is not well stated. The driver already supports detection of all hotkey presses. It's up to userspace utilities to map that to speaker control on machines that don't handle it in firmware. Now, actually controlling the speaker is another story..)
(14 votes) acpid patch

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