On Sun, Nov 6, 2011 at 11:51 PM, Corentin Chary <corentin.chary@xxxxxxxxx> wrote: > On Sun, Nov 6, 2011 at 11:16 PM, Len Brown <lenb@xxxxxxxxxx> wrote: >>> I was looking at the DSDT of a new samsung laptop (I can send you the >>> output of acpidump if interested), and it export a standard ACPI ALS >>> device. So, it's actually great to see vendor using that, but it seems >>> that the series adding support for that and sent back in 2009 is not >>> available in the kernel. I'd really like to use my the ALS, what's the >>> current status of the driver ? Still blocked because we don't have a >>> generic sysfs class ? If yes, can't we just use a non-standard >>> interface ? It would still be better than no driver at all. >> >> Yes, I think ACPI ALS support has been waiting for hardware to justify >> its existence. >> >> When it first entered the spec, we were excited to see it was present >> in some high-end laptops, but IIR on closer examination the AML turned >> out to be dummy code. >> >> If you can verify that your Samsung really does implement ACPI ALS, >> then that is all we need to stumble forward. I just found some time to try the latest patch series I could found on gmane (v6 I think). Here are the results: $ uname -s -r Linux 3.0.0-14-generic $ tree -L 1 /sys/class/als/acpi_als0/ /sys/class/als/acpi_als0/ ├── device -> ../../../LNXSYSTM:00/device:00/PNP0A08:00/device:02/PNP0C09:00/ACPI0008:00 ├── display_adjustment ├── illuminance ├── power ├── subsystem -> ../../../../class/als └── uevent // light off $ cat display_adjustment 23% $ cat illuminance 7 // light on $ cat display_adjustment 74% $ cat illuminance 368 // finger on sensor $ cat display_adjustment 7% $ cat illuminance 1 So, it works perfectly, and since I've just added keyboard backlight support in samsung-laptop, that would be the last (kernel) bit to enable automagic screen/keyboard backlight :). -- Corentin Chary http://xf.iksaif.net -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
