[Librem-5-dev] Bringing up the lcd

[Guido Günther]

Hi,
On Wed, Mar 06, 2019 at 11:39:14AM +0800, Andy Green via Librem-5-dev wrote:
> Hi -
> 
> I'm running
> 
> Linux version 4.18.11-00385-g997d1697a591
> 
> which is HEAD from March 5th... how to bring up the LCD + backlight from the
> commandline?
> 
> Eg,
> 
> # echo 1 > /sys/class/backlight/backlight_dsi/bl_power
> # echo 100 > /sys/class/backlight/backlight_dsi/brightness
> 
> doesn't buy me anything.
> 
> # chvt 2
> 
> shows it spawned an agetty on the VT, but nothing displayed.
> 
> /sbin/agetty -o -p -- \u --noclear tty2 linux
> 
> Is it written somewhere how to bring up the display with current
> kernels?

If you already flashed a new image¹ (just updating the kernel is not
enough since you also need to update device tree) and the backlight
doesn't even turn on try reseating the ribbon cable². In case of a
complete blank display that's the number one cause.
Cheers,
 -- Guido

1: https://developer.puri.sm/Librem5/Development_Environment/Boards/imx8.html#flashing-emmc
2; https://source.puri.sm/Librem5/developer.puri.sm/issues/82

> 
> -Andy
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