kernel 5.4.x breaks backlight control on PiTFT(STMPE610) #3767
Comments
|
That commit has been back-ported into rpi-5.4.y (42a52f1a) and will be in the next firmware release. |
popcornmix
added a commit
to raspberrypi/firmware
that referenced
this issue
Jul 31, 2020
See: raspberrypi/linux#3765 kernel: overlays: Delete spi0-hw-cs See: raspberrypi/linux#3355 kernel: backlight: gpio: Explicitly set the direction of the GPIO See: raspberrypi/linux#3767 kernel: overlays: Add maxtherm overlay for MAX6675/31855 See: raspberrypi/linux#3763 firmware: arm_loader: Knock 1.7 seconds off boot time See: #1375 firmware: Imx477 external sync signals
popcornmix
added a commit
to Hexxeh/rpi-firmware
that referenced
this issue
Jul 31, 2020
See: raspberrypi/linux#3765 kernel: overlays: Delete spi0-hw-cs See: raspberrypi/linux#3355 kernel: backlight: gpio: Explicitly set the direction of the GPIO See: raspberrypi/linux#3767 kernel: overlays: Add maxtherm overlay for MAX6675/31855 See: raspberrypi/linux#3763 firmware: arm_loader: Knock 1.7 seconds off boot time See: raspberrypi/firmware#1375 firmware: Imx477 external sync signals
|
Please test latest rpi-update kernel and report if issue is resolved |
|
Yes, works fine. Thanks. |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Describe the bug
After the update of the Raspberry Pi OS to kernel 5.4 (from 4.19) the backlight control no longer works. When trying to turn on/off the backlight as described here the backlight simply stays on with no error output.
This issue seems to be fixed in kernel 5.5 by this commit. Compiling the current rpi-5.4.y branch with the gpio-backlight module from rpi-5.5.y results in the backlight control working again.
System
Raspberry Pi 2B
cat /etc/rpi-issue)?Raspberry Pi reference 2020-02-13
vcgencmd version)?Jul 17 2020 11:04:27
Copyright (c) 2012 Broadcom
version 21a15cb094f41c7506ad65d2cb9b29c550693057 (clean) (release) (start)
uname -a)?Linux raspberrypi 5.4.51-v7+ var->green.length may be left uninitialized #1 SMP Thu Jul 30 15:26:28 CEST 2020 armv7l GNU/Linux(mind you that this is my own build of the latest rpi-5.4.y branch with a fix applied)
The text was updated successfully, but these errors were encountered: