<Jookia>
linux has a blue tint and i can't figure out why
<gamiee>
Blue tint?
<Jookia>
yes, see the image
<Jookia>
top is linux, bottom is u-boot
<gamiee>
It looks like more strong backlight for me.
<Jookia>
that's what i would imagine to be the case, but there's no reason for it
<Jookia>
the backlight voltage is the same in both cases
<gamiee>
Are you sure-> measured with multimeter?
<Jookia>
yes, measured with a scope
<Jookia>
I've scoped all the RGB timings, I've scoped the backlight LED
<gamiee>
Hm
<Jookia>
I've measured the MIPI DBI commands
<gamiee>
Can't you dump all LCD controller registers and compare?
<Jookia>
I've dumped and compared all the LCD controller registers and the bulk of the display engine registers
<gamiee>
No diff?
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<Jookia>
Not really for the controller, but I'm not sure about the DE. I turned off the mixing and pipeline
<Jookia>
It showed the same blue color
<Jookia>
Disabling DE output or whatever removed the color
<gamiee>
Hmmmmm
<Jookia>
Looking at the board schematics, the only possible thing I can think of is the LED backlight driver pin is floating and maybe this is picking up RF noise or something
<Jookia>
But I don't see anything on the scope
<Jookia>
I would expect the voltage to be drastically different to get a different backlight like this
<Jookia>
I have managed to get the panel to a state accidentally where it would no longer do this brightness. Messing with sync polarities between boots seems to do this
<Jookia>
I have also measured reset timings
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<tokyovigilante>
painful, and does
<tokyovigilante>
look very blue. maybe the colour temp is set wrong? will try your u-boot patch on my devices and see if there is any difference in rendering, it is currently ok in Linux though.
<Jookia>
my jookia_testing branch has the latest changes i've done today, including a fix in the sunxi code for timings
<tokyovigilante>
awesome thanks, I’m away currently so won’t be till next week.
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<mripard>
Jookia: have you tried dumping the DE and CRTC registers ?
<Jookia>
mripard: yeah. i'm not sure what to make of it yet
<Jookia>
i didn't see anything obvious
<mripard>
even when comparing to the U-Boot setup?
<Jookia>
yeah
<Jookia>
i'm not sure entirely what i'm looking for