Hi, Am 17.06.2012 01:16, schrieb Mattia Dongili: > I'm a bit lost at this point. Are you saying that you cannot get a > working backlight control with the old set-up you had? Yeah, I can't get it working. Tried nearly every kernel from 3.0 onwards. Don't know what is going on here :(. Any idea what could have caused this? > If so what else did you change in your set up? Well, I'm on Arch Linux, which is a rolling release distribution. So there is probably a lot of stuff, which has changed during the course of the last two to three months :(. > Also, any chance you could try to inspect/poke the acpi_video0 or > sony-laptop backlight directories without loading the nouveau driver? Yeah, sure. In both cases the brightness won't change. Here you have some excerpts in the case of "acpi_backlight=vendor" again: [root@vpcs ~]# grep . /sys/class/backlight/sony/*/* /sys/class/backlight/sony/actual_brightness:-13 /sys/class/backlight/sony/bl_power:0 /sys/class/backlight/sony/brightness:-13 /sys/class/backlight/sony/max_brightness:242 /sys/class/backlight/sony/type:platform I then echoed 100 to /sys/class/backlight/sony/brightness and dmesg reported the following: [ 89.631235] sony_laptop: found handle 0x0137 (offset: 0x0b) [ 89.753455] sony_laptop: __call_snc_method: [SN07:0x000000000000020b] [ 89.753457] sony_laptop: called SN07 with 0x020b (result: 0x0000) Not sure what this means, but probably nouveau is not the culprit here. Best regards, Karol Babioch
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