Question about LCD

Lars-Peter Clausen lars at metafoo.de
Wed Mar 17 11:27:43 EDT 2010


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Carlos Camargo wrote:
> Hi
>
>> One question about LCD:
>>> How can I turn-on/off LCD?
>> On: echo 0 > /sys/class/lcd/*/lcd_power Off: echo 4 >
>> /sys/class/lcd/*/lcd_power
>>
>
>
> echo 0 > /sys/class/lcd/gpm940b0-lcd/lcd_power
>
> doesn't works :(
The display stays off? Make sure that the framebuffer is not blanked
as well.

echo 0 > /sys/class/graphics/fb0/blank
>
>
>> Uhm, that looks as if you the display timings were changed. Or
>> maybe the display contents is in CS1 range and somehow by
>> switching between both the LCD controllers DMA gets out of sync
>> or something.
>>
>> Does it always look the same after CS2 one write, or does it
>> change with every write?
>>
>>
> The same behavior on each CS2 write only.
And does it go away if you blank/unblank the framebuffer?

echo 4 > /sys/class/graphics/fb0/blank
echo 0 > /sys/class/graphics/fb0/blank

- - Lars
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