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Old 05-22-2013, 10:38 AM   #1
Vava
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Open a web page at startup on a PaperWhite

Hi !


As part as a project I will need to display at startup the content of a web page (basically an image). And then update this content each hour (for example). I saw a thread (http://www.mobileread.com/forums/sho...d.php?t=210210) who will allow me to display the page in full screen.

But how can I do it at startup, without any "human" intervention ?

Then, it would be even better if I manage to fully replace the OS by a basic Linux who will only launch my web browser with the url I want.
Do you think this is possible and if so, do you have any ideas ?
I confess, I'm really new with kindle tablet and the project is quite short, so if it gets really complicated I will keep the first option.

Thanks for your advices.

Vadim
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Old 05-22-2013, 11:26 AM   #2
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I think it could be done using an upstart script and the end of the upstart process.
But wait for more info!
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Old 05-22-2013, 01:48 PM   #3
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http://www.mobileread.com/forums/sho...d.php?t=198484
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Old 05-23-2013, 02:48 AM   #4
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Thank you both, a script plus the event handler will do the trick !

But, I have an other question, is that possible to manage the processor activity ? For example, when the kindke puts itself on standby, I would like to reduce the cpu activity to 10% and shut off the WiFi. Do you know how can I do it ?
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Old 05-23-2013, 06:24 AM   #5
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Quote:
Originally Posted by Vava View Post
Thank you both, a script plus the event handler will do the trick !

But, I have an other question, is that possible to manage the processor activity ? For example, when the kindke puts itself on standby, I would like to reduce the cpu activity to 10% and shut off the WiFi. Do you know how can I do it ?
I don't really understand the question. When the Kindle is in standby, it's pretty much powered off. I don't think the Wifi is on in that state, and it shouldn't be processing anything (though I seem to recall that cronjobs still get executed, so take the above with a grain of salt).
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Old 05-23-2013, 08:26 AM   #6
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posted within the past week:
echo 'mem' >/sys/power/state

or something like that, search for my post in the thread subject of turning the Kindle off.
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Old 05-24-2013, 03:52 AM   #7
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Thanks ixtab for your informations, I will get the kindle today, I didn't knew about the sleep mode implications.
knc1, I saw your post, I will take a look at it ! Thanks too.
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Old 05-24-2013, 08:24 AM   #8
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Quote:
Originally Posted by ixtab View Post
I don't really understand the question. When the Kindle is in standby, it's pretty much powered off. I don't think the Wifi is on in that state, and it shouldn't be processing anything (though I seem to recall that cronjobs still get executed, so take the above with a grain of salt).
On my paperwhite - Which to all external signs is sound asleep ::

Plug in USB cable:
Code:
PM: resume of devices complete after 804.277 msecs
kernel: I PM:resume:duration=804.277:
Restarting tasks ... done.
g_ether gadget: high speed config #1: CDC Ethernet (ECM)
Battery: Resume - TimeSuspended(secs)=569234, NAC=0x1ed1, RSOC=98, capacity=92%
Battery: Resume - PostUpdate NAC=0x1c25, RSOC=98 
[root@kindle root]#
Which to me reads as if I forgot to shutdown USB network before putting it away the last time I used it.
(A change in the device's system resources will wake Linux from suspend - any Linux, even your desktop).

So the report says it sat in its case about 6.5 days, waiting for something to happen.
Used 8% of the battery capacity doing that.

According to the dmesg above - cron would not have been running - but I suspect the hardware timers where.
And obviously, the USB buses where powered (so the change in bus configuration could wake the sleeping kernel).

PS: Yes, earlier in the kernel message buffer it mentioned that the Wifi chip was powered off.

Last edited by knc1; 05-24-2013 at 08:32 AM.
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Old 05-25-2013, 06:34 AM   #9
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Knc1, could you explain how you get those type of logs please ? It seems really helpful
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Old 05-25-2013, 08:17 AM   #10
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Quote:
Originally Posted by Vava View Post
Knc1, could you explain how you get those type of logs please ? It seems really helpful
From SSH terminal connection:

dmseg (does not clear the buffer)
dmseg -c (does clear the buffer)

Re-direct to a file if you want to save the output.

From the KUAL launcher:
touch the: dmesg -> document button.

That does clear the buffer, but each generated text document is named by its date-time stamp of creation.

For the post above, I used the first method - because the screen saver was still displayed by the "wake on USB event" process.
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Old 05-25-2013, 10:39 AM   #11
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Thanks knc1 ! I have a final question, do you need to use SSH connection to perform sudo command ? When I tried to edit some file I get a permission denied and the sudo command is unknown..
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Old 05-25-2013, 10:45 AM   #12
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Thanks knc1 ! I have a final question, do you need to use SSH connection to perform sudo command ? When I tried to edit some file I get a permission denied and the sudo command is unknown..
On the Kindle ?
You are already running as root.

Some of the filesystems are mounted read-only;
Some of the filesystems can not be written by design.

"tried to edit some file" <<--- which one? where?
It makes a difference in the answer.
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Old 05-25-2013, 10:50 AM   #13
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Ok, for example, an "echo mem >/sys/power/state" is not working.
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Old 05-25-2013, 12:12 PM   #14
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Ok, for example, an "echo mem >/sys/power/state" is not working.
Maybe I mis-spelled the option(s)

do cat /sys/power/state
to see what options it expects.

if I mis-spelled a directory or file name - look for them near that spot in the system tree.
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Old 05-25-2013, 02:58 PM   #15
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The spelling is OK, that's why I don't understand... But, I found an other way to do it, so don't bother you And thank you for all your help !
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