[Gta04-owner] Linux 3.2-rc2 on GTA04

Johannes Schauer j.schauer at email.de
Thu Nov 24 23:40:09 CET 2011


On Fri, Nov 25, 2011 at 09:20:36AM +1100, NeilBrown wrote:
> Something strange here.  Glad that the GPIO pin is clearly working,
> but cannot imagine why it isn't being turned on.
> How do "gta04_enable_lcd" and "gta04_disable_lcd" dmesg messages align with
> the other events.
> In particular, when the display is dark and you tap the display, do you get
> the message "gta04_enable_lcd" even though it doesn't turn on the backlight,
> or do you not get the message at all?

after bootup (me doing nothing - just xorg loading):

[   50.105957] td028ttec1_panel_suspend()
[   50.131927] gta04_disable_lcd()
[   50.911926] td028ttec1_panel_resume()

then I do

	echo 1 > /sys/class/gpio/gpio57/value

to turn it on (works)

when the display suspends after a 10 minute timeout (works and gets dark):

[  355.885772] td028ttec1_panel_suspend()
[  355.898132] gta04_disable_lcd()

then I tap the display (backlight doesnt turn on):

[  368.835754] td028ttec1_panel_resume()

then I do

	echo 1 > /sys/class/gpio/gpio57/value

to turn it on (works)

> (Also - glad to know the touch screen and display and all is basically
> working - that is all in upstream code now.  David's kernel had lots of
> display related patches that I don't need because Linus has them!).

indeed - the basic functionality is indeed there which is extremely great :)

another thing i'm playing with is the display resolution. currently it
omapfb.mode=lcd:640x480 which is of course wrong and distorts half of
the display output. I changed it to omapfb.mode=lcd:480x640 which made
the output of the linux penguin during bootup show up correctly but xorg
is now believing to have a 1024x768 display - wtf?? of course one only
sees the top left corner of the 1024x768 screen on the display...

what fixed this issue for the 3.1 kernel was:
but i guess the video= argument is now replaced by omapfb.mode ?

cheers, josch

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