#linux-sunxi on 2019-06-02 — irc logs at freenode.irclog.whitequark.org

2018-08-03 10:18 rellla changed the topic of #linux-sunxi to: Allwinner/sunxi /development discussion - did you try looking at our wiki? https://linux-sunxi.org - Don't ask to ask. Just ask and wait! - https://github.com/linux-sunxi/ - Logs at http://irclog.whitequark.org/linux-sunxi - *only registered users can talk*

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02:57 <steev> anarsoul: any guidance in figuring out why the backlight pwm is getting disabled? unfortunately, googling debugging pwm issues brings up a ton of unrelated pwm

02:58 <steev> anarsoul: also, this thread on armbian shows somewhat more info in what i'm seeing - https://forum.armbian.com/topic/10509-11-pinebook-with-1080p-no-video-backlight-with-5x-kernels/

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03:17 <anarsoul> steev: no idea, it works fine for me

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03:49 <steev> i have to do the same thing with the tegra chromebook, which also has a 1080p screen instead of the typical 1366x768 (adding in regulator-always-on) - although there, the tendency is that it's intermittent whether the backlight regulator turns off or on.

03:53 <anarsoul> steev: regulator-always-on is not an option, in this case backlight power is not disabled when screen is off

03:53 <steev> i realize it's not a workable option for upstream

03:54 <steev> locally, if i have to choose between no video, and using extra power to have video... i'm going to patch it in

03:54 <steev> unless i can figure out how to debug what's going on, and unfortunately, no one seems to know how

03:57 <steev> Sorry, that was a bit more snippy than I meant it - I’m just frustrated with the fruitless searches on google for pwm debugging

04:04 <anarsoul> steev: I don't think there's anything special about pwm, just debug it as any other kernel driver

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04:21 <steev> hah. this boot it worked (although there's still a "bl-3v3: disabling" in the dmesg output

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05:02 <wens> what version kernel are you using? do you have the backlight driver enabled?

05:05 <steev> actually i'm thinking it isn't the issue - it's worked 3 reboots in a row now, though there's no console early on, but that's not a big deal

05:06 <steev> definitely need to do more digging, this is very weird

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15:41 <MoeIcenowy> martinayotte: the timer bug workaround code in armbian 4.19.38-sunxi64 seems to be not so good

15:41 <MoeIcenowy> one of my friend still triggered the timer bug just now

15:42 <MoeIcenowy> when he discovered his board travelled to 2209-09-16

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16:29 <anarsoul> MoeIcenowy: they probably backported only dts patch without actual fix

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19:34 <martinayotte> MoeIcenowy: This is strange since the commit has been done into "next" almost 2 months ago, and even earlier in "dev" : https://github.com/armbian/build/blob/master/patch/kernel/sunxi-next/0001-arm64-dts-allwinner-a64-Enable-A64-timer-workaround.patch

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20:12 <martinayotte> MoeIcenowy: anarsoul: I've checked armbian sunxi-next, and not only DTS patch is there, but also the code : https://github.com/armbian/build/blob/master/patch/kernel/sunxi-next/patch-4.19.30-31.patch

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