Hi Dario,
----- Dario Binacchi <dario...@libero.it> a écrit : > Hi Guillaume, > > > Il 21/10/2021 16:47 Guillaume GARDET <guillaume.gar...@free.fr> ha scritto: > > > > > > Hi, > > > > Commit 76c2ff3e [0] broke backlight on Chromebook snow. > > A revert on top of 2021.10 restores the backlight. > > Not sure why it breaks on Chromebook snow yet. Dario, any idea how to fix > > this? > > Is it possible that max_level is equal to min_level and therefore division > by zero is done? I do not think so, because u-boot does not crash and the DTS file has multiple levels: https://source.denx.de/u-boot/u-boot/-/blob/master/arch/arm/dts/exynos5250-snow.dts#L243 I think the problem occurs when 'cur_level == max_level', which is also the default value in the DTS. If I change the default-brightness-level to 6 (instead of 7), then the backlight works again, which would confirm the assumption above. pwm_backlight_set_brightness seems to set cur_level to max value by default. Maybe the driver thinks there is nothing to do, since current level is also the desired level? Cheers, Guillaume > > Thanks and regards, > Dario > > > > Cheers, > > Guillaume