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Official Display • Re: Raspberry Pi OS (Bookworm) | Original Raspberry Pi Model B Rev 2 | Raspberry Pi Touch Display | Screen Backlight

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Please can you confirm the revision code for your Pi?
/proc/cpuinfo revision code reads as 000e

Code:

Revision: 000e
It's exactly the same as found on the 2x raspinfo.txt, attached to the original post.

ft5406 is failing on this platform for a long time. It's commented out as disable_touchscreen=1, sorry about omitting explicit mention - it's on the logs! Otherwise, it produces errors similar to the ones in parallel thread, and its presence doesn't fix the backlight anyways.

If backlight driver is from the mainstream kernel, I'd guess the fix will unlikely to materialise any time soon. Are there any work arounds possible? Switching between graphical and multi-user targets works for me most of the time, but kernel and glibc updates do require a reboot.

Something is definitely out there, but the driver is expecting it in a different place.

Code:

xxd /proc/device-tree/panel_disp@1/backlight00000000: 0000 0093xxd /sys/class/backlight/10-0045/bl_power 00000000: 300a                                     0.xxd /sys/class/backlight/10-0045/actual_brightness00000000: 3235 350a                                255.xxd /sys/class/backlight/10-0045/brightness00000000: 3235 350a                                255.xxd /sys/class/backlight/10-0045/display_name00000000: 4453 492d 310a                           DSI-1.xxd /sys/class/backlight/10-0045/max_brightness00000000: 3235 350a                                255.xxd /sys/class/backlight/10-0045/scale00000000: 756e 6b6e 6f77 6e0a                      unknown.xxd /sys/class/backlight/10-0045/type00000000: 7261 770a                                raw.

Statistics: Posted by xot — Wed Dec 11, 2024 3:17 pm



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