On 5/21/26 12:26 AM, Jérôme de Bretagne wrote: > On 5/20/26 18:40, Jérôme de Bretagne via B4 Relay wrote: >> From: Jérôme de Bretagne <[email protected]> >> >> Add backlight nodes and enable backlight so that it can be controlled >> with the corresponding buttons found on Surface Pro Type Cover keyboards. >> >> The nodes are almost identical to the ones from the ThinkPad X13s with >> a different enable GPIO for the vreg_edp_bl node. >> >> The difference was found by looking at the output of /sys/kernel/debug/gpio >> on the ThinkPad X13s to see the properties of its enable gpio9:
[...] > and ... backlight still works! It can also be enabled/disabled with: > /sys/class/backlight/backlight/bl_power > as expected. > > I have no clue why both gpio6 on pmc8280_2 and gpio6 on pmc8280c can enable > and disable the backlight. Is it a common scenario? Could it be that one of them is an ENABLE_BL pin, while the other one enables the regulator? Konrad
