[ltp] tpacpi bug in tpacpi::thinklight/brightness for X1 Carbon
Henrique de Moraes Holschuh
Thu, 2 Jan 2014 10:44:10 -0200
On Wed, 01 Jan 2014, Chris Schumann wrote:
> On 12/31/2013 07:42 AM, Henrique de Moraes Holschuh wrote:
> >On Tue, 31 Dec 2013, Henrique de Moraes Holschuh wrote:
> >>On Mon, 30 Dec 2013, Chris Schumann wrote:
> >>>>I am reading this, but I can't do much without access to a X1. The
> >>>>thinklight control uses a specific ACPI method, so your X1 has it or it
> >>>>would not have turned anything off.
> >>Meh. The "off" command uses the generic "update-cmos" handler (UCMS), which
> >>often just stores info in come nvram instead of doing something. In the
> >>keyboard backlight case, the OFF command for the lights (thinklight and
> >>apparently backlight) actually turns them off, but if there is an ON
> >>command, it is command 0x0e (which is supposed to just toggle the
> >>Please test it, see if thinkpad-acpi will give you the /proc/acpi/ibm/cmos
> >>file. If it still does in your kernel, echo "0x0e" > /proc/acpi/ibm/cmos
> >>might be useful. Other interesting cmos commands might be 0x0b to 0x0d.
> >It is also available in sysfs (far more likely to be supported than the
> >/proc node in a recent kernel). It is likely at
> That directory doesn't exist for me, but I have
> /sys/bus/platform/drivers/thinkpad_acpi/thinkpad_acpi/ and a whole
> bunch of stuff under that.
Try at /sys/devices/platform/thinkpad_acpi. If it is there, it is a more
stable node path.
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