[Gta04-owner] Display on Debian - Was: Debian Status

H. Nikolaus Schaller hns at goldelico.com
Sat Feb 18 17:46:39 CET 2017


> Am 18.02.2017 um 17:44 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
> 
> 
>> Am 18.02.2017 um 17:41 schrieb Josua Mayer <josua.mayer97 at gmail.com>:
>> 
>>>> Adding:
>>>> - display stays black. Any ideas?
>>> Hm. This can be a lot of things. Maybe X11 config.
>>> Do you see a /sys/class/backlight entry?
>> No x11. This is a minimal cli-only system.
>> /sys/class/backlight is as empty as can be.
>> I found that there are only 2 display connector modules available:
>> connector-analog-tv.ko, connector-hdmi.ko
>> With only the former loaded.
> 
> That is ok since the omap3 has no hdmi port.
> The panel is a separate driver.
> 
>> menuconfig lists DPI, HDMI, SDI and DSI.
>> Is this the key here?
>> 
>> And we are probably also missing the panel drivers.
> 
> Hm. The display system should work upstream - but maybe
> they are not configured?
> 
> Display backlight also needs some omap pwm driver so this
> can be the reason why it does not show up in /sys/class/backlight.

In http://download.goldelico.com/letux-kernel/letux-4.10-rc8/src/CONFIG
we have backlight/pwm related:

CONFIG_BACKLIGHT_CLASS_DEVICE=y
CONFIG_BACKLIGHT_GENERIC=m
CONFIG_BACKLIGHT_PWM=m
CONFIG_PWM=y
CONFIG_PWM_SYSFS=y
CONFIG_PWM_OMAP_DMTIMER=m

And for panel:

CONFIG_DRM_OMAP_PANEL_TPO_TD028TTEC1=m

BR,
Nikolaus


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