System should wake up from screen saver mode with Touch Screen event

durai samy

Other Parts Discussed in Thread: AM3354

Hi,

We are working in screen saver functionality, It seems system is waking up from screen saver mode by pressing keys in USB keyboard only. We are expecting it should also wake up from touch screen event also.

Below is the kernel parameter configure,

"echo 10 > /sys/module/kernel/parameter/consoleblank" => Entering into screen saver mode after 10 sec.

"echo 0 > /sys/module/kernel/parameter/consoleblank" => Screen saver disabled.

Where do we need to configure for screen saver should respond to touch screen event?

Please help on this.

Regards

Durai

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Hi,

Which processor and what Linux version are you using?

0 durai samy over 10 years ago in reply to Biser Gatchev-XID

Intellectual 515 points

Hi Biser,

Please find the below details,

Processor : AM3354

Linux Kernel : 3.12

TI SDK Version : 7

Regards

Durai

0 Biser Gatchev-XID over 10 years ago in reply to durai samy

TI__Guru**** 393215 points

I have asked the SW team to help on this.

0 durai samy over 10 years ago in reply to Biser Gatchev-XID

Intellectual 515 points

Hi Biser,

Thanks! Do you have any update on this?

Regards

Durai

0 Biser Gatchev-XID over 10 years ago in reply to durai samy

TI__Guru**** 393215 points

Feedback will be posted here when available.

0 Kemal R. Shakir over 10 years ago in reply to Biser Gatchev-XID

TI__Guru 55345 points

Hello Durai,

Is your system goes in low-power mode when the screen goes blank?
Are you able to wake up the system trough the touch screen on standby:

echo standby > /sys/power/state

What is written in your /sys/devices/ocp.2/44e0d000.tscadc/power/wakeup file?

Best regards,
Kemal

0 durai samy over 10 years ago in reply to Kemal R. Shakir

Intellectual 515 points

Hi Kemal,

Thanks for reply,

The system does not goes to Low power when it is in Screen saver mode. I'm able to wake up the system from standby by using touch event.

Our is I2C based touch screen so 44e0d000.tscadc file not available.

Regards

Durai

0 Kemal R. Shakir over 10 years ago in reply to durai samy

TI__Guru 55345 points

Then, if you put the device in sleep mode during the screen saver, you'll be able to wake it up by touch screen otherwise you should create a handler which handles touch screen event and calls do_unblank_screen.

0 durai samy over 10 years ago in reply to Kemal R. Shakir

Intellectual 515 points

Hi Kemal,

Thanks for reply, I will check it. Have notice that if I press the key's in USB key board Screen saver time is resetting whereas touch screen is in active Screen saver time is not getting reset.I mean if I set the screen saver time is one minute and touch screen is active after a minute screen goes to off. This is not in USB keyboard event.

Do you have any idea about where the USB keyboard event is hooked for Screen saver settings?

Regards

Durai

0 Kemal R. Shakir over 10 years ago in reply to durai samy

TI__Guru 55345 points

Hello Durai,

Sorry for my late reply.

You can Check the vt screen saver source in the kernel source tree at location drivers/tty/vt for keyboard hooks. I assume that on keyboard event the kbd_event function in keyboard.c file is called which assigns 1 to do_poke_blanked_console. Also have a look at console_callback function in vt.c file which checks for expired blank timer and does do_blank_screen.

Best regards,
Kemal

0 durai samy over 10 years ago in reply to Kemal R. Shakir

Intellectual 515 points

Hi Kemal,

I would like to thank you by heart for your hint.Now Screen saver respond with touch screen event after called the "do_poke_blanked_console=1" and "schedule_console_callback()" in touch screen driver whenever co-ordinates are reporting.

Now if I touch the screen, system wake up from screen saver mode.

Happy to see the Community member helped for solving this issue :-)

Thanks kemal.

Regards

Durai

Processors

Processors forum

System should wake up from screen saver mode with Touch Screen event