Hi, the keyboard backlight has been working for me for the last couple of years without any problems and I was fine with the default values, so I wasn't too happy when I realized that a recent kernel upgrade has changed this by leaving the backlight always on. I've tracked down the "issue" to a specific commit (see [1]) from Mattia itself, so I guess he had every reason to make this change. I've dealt with the "problem" with a specific modprobe.d file. I'm wondering whether this is the right approach, though. The default behavior before even any "sony-laptop" module is loaded at all (e.g. within the BIOS and/or the bootloader selection menu) is to enable the keyboard backlight with a timeout of 10 seconds - at least on my machine. This has changed with the recent commit once the module is actually loaded and the backlight is never turned off again. The sysfs interface reports "-1" for both "kbd_backlight" and "kbd_backlight_timeout", which in itself is fine according to the message describing the commit as the values can't be known until having them set for the first time. But to my understanding the commit shouldn't change the default behavior for the keyboard backlight itself, as it actually doesn't touch the registers involved. But as the behavior has actually changed, something is definitely going on here, which might not necessarily be intentional. So is this something that has been overlooked, or is my understanding of the new behavior wrong? Best regards, Karol Babioch [1]: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/platform/x86/sony-laptop.c?id=294d31e8227c9892a89d6b3e58d17886b79ea4e6
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