On 15.10.19 03:03, Rado S wrote: > =- Michael Biebl wrote on Mon 14.Oct'19 at 23:20:57 +0200 -= > >> Am 14.10.19 um 23:13 schrieb Rado S: >>> dell_backlight: Failed to write system 'brightness' attribute: No such >>> device or address >> >> Looks like a kernel or firmware/bios problem to me. >> >> Since you didn't use reportbug there is no information about your used >> kernel. > > It is in the journalctl output; > Linux version 4.19.0-6-686-pae (debian-ker...@lists.debian.org) (gcc version > 8.3.0 (Debian 8.3.0-6)) #1 SMP Debian 4.19.67-2 (2019-08-28) > > The dell d600 (also failing) uses the non-pae version of it. > The functioning vostro uses the same pae-version. > > What more information can I provide? >
It appears you have backlight device without a brightness attribute. Here this look like this > # ls -la /sys/class/backlight/intel_backlight/ > insgesamt 0 > drwxr-xr-x 3 root root 0 Okt 15 13:29 ./ > drwxr-xr-x 4 root root 0 Okt 15 01:15 ../ > -r--r--r-- 1 root root 4096 Okt 15 13:27 actual_brightness > -rw-r--r-- 1 root root 4096 Okt 15 13:27 bl_power > -rw-r--r-- 1 root root 4096 Okt 15 13:28 brightness > lrwxrwxrwx 1 root root 0 Okt 15 13:27 device -> ../../card0-LVDS-1/ > -r--r--r-- 1 root root 4096 Okt 15 01:15 max_brightness > drwxr-xr-x 2 root root 0 Okt 15 13:27 power/ > lrwxrwxrwx 1 root root 0 Okt 15 01:15 subsystem -> > ../../../../../../../class/backlight/ > -r--r--r-- 1 root root 4096 Okt 15 01:15 type > -rw-r--r-- 1 root root 4096 Okt 15 01:15 uevent I can get the current brightness via > # cat /sys/class/backlight/intel_backlight/brightness > 1500 and change it via > # echo 2000 > /sys/class/backlight/intel_backlight/brightness What's the output you get for your dell_backlight? -- Why is it that all of the instruments seeking intelligent life in the universe are pointed away from Earth?
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