ChanServ changed the topic of #armlinux to: ARM kernel talk [Upstream kernel, find your vendor forums for questions about their kernels] | https://libera.irclog.whitequark.org/armlinux
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<mort>
Hey, I'm having trouble upgrading between Linux versions and am suspecting our devicetree is to blame. In Linux 5.7 (the version we're trying to migrate to), the backlight doesn't work, doesn't even show up in /sys/class/backlight. This is our backlight devicetree node, which used to work in 4.9 and 4.14: https://p.mort.coffee/ZYD
<geertu>
mort: Could it be a missing config symbol?
<mort>
hmm I can search for backlight in the menuconfig and see if anything looks wrong
<geertu>
- Enable CONFIG_BACKLIGHT_CLASS_DEVICE (needed for
<geertu>
CONFIG_BACKLIGHT_PWM, and no longer auto-enabled since commit
<geertu>
bcd69da98e36afcc ("video: backlight: Drop default m for
<geertu>
{LCD,BACKLIGHT_CLASS_DEVICE}")).
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<mort>
well that looks awfully relevant
<Xogium>
damn, this nick makes me shiver every time I read it :D
<Xogium>
mort: your nick means dead or death in french ;)
<mort>
yeah I know :D
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<Xogium>
ah so you do speak french
<mort>
une peu
<Xogium>
:D
<Xogium>
careful guys, we have an undead irc user
<mort>
mais mon francais n'est pas tres bon
<Xogium>
;)
<mort>
I got the nick before learning french though
<mort>
it's an anglification of another nick, mørt
<mort>
geertu: hmm BACKLIGHT_CLASS_DEVICE and BACKLIGHT_PWM are both =m
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<geertu>
mort: Is the backlight class module loaded (befoe the backlight pwm module)?
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<mort>
geertu: the "backlight" module is loaded and "used by" bl_pwm, bl_pwm is loaded but used by 0
<mort>
loading the pwm_bl module, it prints "pwm-backlight backlight: supply power not found, using dummy regulator"
<mort>
though that's not new, it did that in 4.9 as well and I don't think it should be an issue
<mort>
one difference is that the backlight module is builtin, not a module, in the 4.9 build
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<geertu>
mort: Try to make it builtin, and see what happens?
<mort>
currently waiting for a build which does precisely that :p
<mort>
it'll take a while for stupid reasons
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<mort>
geertu: well, making backlight =y instead of =m had no effect
<geertu>
mort: bummer
<mort>
yea
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