Backlight control (Sharks Cove schematics)

radolfyr at web.de radolfyr at web.de
Sun Jul 3 17:18:24 CEST 2016


Ok. Now the new build kernel does not hang anymore. So some patch for the asus t100 seems to result in a hanging kernel on the click. However don't know which patch it is.
 
 
I found this:
https://bugs.freedesktop.org/show_bug.cgi?id=96571
With the toshiba click we get the same error. Maybe the patch in the last post works also for us (If it is working).
Sadly i could not test it...

I tried to apply the patch and build a 4.7rc4/5 kernel. However the click hangs on startup.
However these hangs have nothing to do with this patch. I just applied the asus t100 patches. The compiled kernel works with a t100.
Now I will try the vanilla kernel with just the keyboard/touchscreen fixes. Hopefully this is booting then...

best
regards
Stefan 

Gesendet: Donnerstag, 30. Juni 2016 um 17:48 Uhr
Von: "Nicolas Huillard" <nicolas at huillard.net>
An: click at tinc-vpn.org
Betreff: Backlight control (Sharks Cove schematics)
Hi all,

Reading the Sharks Cove schematics PDF (the TCM really seems to be the
same hardware), I see that the backlight is connected to the SIO_PWM(0)
output of the SoC (maybe some sort of SIO device driver need to be
enabled, just like GPIO).
The DSDT (found on
http://www.zaurus.org.uk/download/toshiba_click_mini_l9w/[http://www.zaurus.org.uk/download/toshiba_click_mini_l9w/] thanks Paul)
mentions two PWM devices as "Device (PWM1)" and "Device (PWM2)" with
HID/CID "80860F09" and various methods (Power State 0 and 3, Current
Resource Settings, etc.).
I guess controlling the backlight is a matter of actually using those
devices (or one of those, preferably the first one).

--
NH

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