Bug 198823

Summary:	"backlight: pwm_bl Check the PWM state" patch switch off and disable Backlight on A13 tablet
Product:	Drivers	Reporter:	silviop (far5893)
Component:	Video(Other)	Assignee:	drivers_video-other
Status:	NEW ---
Severity:	normal	CC:	far5893, thierry.reding
Priority:	P1
Hardware:	ARM
OS:	Linux
Kernel Version:	4.14.19	Subsystem:
Regression:	Yes	Bisected commit-id:

Description silviop 2018-02-19 13:40:36 UTC

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/drivers/video/backlight/pwm_bl.c?h=v4.14.20&id=d1b81294575098d989be1f2f6bb628091ceaa87b

The check in patch at link stop back-light working on A13 Allwinner tablet in kernel 4.14 with mainstream dts.

With kernel 4.9 on same hardware  (and main stream dts) all is ok and working.

Comment 1 silviop 2018-02-22 13:27:51 UTC

If i remove that patch all is working on kernel 4.14.19 too!