[Gta04-owner] 3.7-kernel: poweroff?

Dr. H. Nikolaus Schaller hns at goldelico.com
Mon Feb 25 20:37:42 CET 2013

Hi Neil,

Am 22.02.2013 um 08:55 schrieb Dr. H. Nikolaus Schaller:

> Am 22.02.2013 um 02:01 schrieb NeilBrown:
>> On Thu, 21 Feb 2013 14:06:17 +0100 "Dr. H. Nikolaus Schaller"
>> <hns at goldelico.com> wrote:
>>> Hi Neil,
>>> I am not sure if I have broken something or if it is not implemented, but I found that "poweroff" does not power off... the console prints "Halt" and the red power LED remains on.
>>> I remember that I had a patch for the hw-validation kernel because the default implementation of Linux just ends in a loop but does not notify the TPS65950.
>> Works for me...
>> I use "poweroff -f" because I don't trust the shutdown scripts, and I don't
>> really care about running them. 
>>   poweroff -f
>> just calls sync() and then the 'reboot' system call with flags to say 'power
>> off'.
>> Console reports:
>> [  365.998046] Power down.
> This is missing with my extended kernel.
>> and all the LEDs (which it had turned on with
>>  for i in /sys/class/leds/*/trigger; do echo default-on > $i; done
>> ) turned off.
>> This is enabled by code in drivers/mfd/twl4030-power.c, particularly:
>> 		pm_power_off = twl4030_power_off;
>> which sets the power-off handler.
>> This is in mainline since commit 26cc3ab984cd00e95cb58ba5aaea4238ea56c700
>> which was in linux-3.3.
>> So I suggest testing if "poweroff -f" works.  If it does, then examine your
>> init scripts.  If it doesn't, then check if "twl4030_power_off" is getting
>> called.
>> I just tried "poweroff" (no flags) on my (Debian) phone and it does work.
>> It goes through
>> [ ok ] Unmounting temporary filesystems...done.
>> [ ok ] Deactivating swap...done.
>> [ ok ] Unmounting local filesystems...done.
>> [info] Will now halt.
> After that it hangs.
>> and then
>> [  115.671386] Power down.
>> and power is indeed down.
> So I must have some driver that is not properly unloading.
> Maybe PVR or Camera (stub) driver.

Yes, it is my incomplete ov9655 driver.

If I try to rmmod ov9655, the rmmod process hangs and does not respond to kill -9. There is not even a dmesg entry.

So it is very likely that the problem disappears when I have fixed the ov9655 driver.


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