Hi, Am 16.06.2012 00:37, schrieb Mattia Dongili: > ok, let's forget about gnome popups for a moment, can you try using the > sysfs files directly? I suppose you expect me to use the "acpi_backlight=vendor" parameter? Because when leaving it out, I don't have any sony subdirectory within /sys/class/backlight. The only directory is /sys/class/backlight/acpi_video0, but changing the brightness directly there doesn't change anything. With the "acpi_backlight=vendor" boot paramater I got a sony sub directory (as well as a "nv" subdirectory), but see yourself: [johnpatcher@vpcs ~]$ ls -l /sys/class/backlight/ insgesamt 0 lrwxrwxrwx 1 root root 0 16. Jun 2012 nv_backlight -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-LVDS-1/nv_backlight lrwxrwxrwx 1 root root 0 16. Jun 01:00 sony -> ../../devices/virtual/backlight/sony I tried to change the brightness via sysfs with the following command: [root@vpcs sony]# cat actual_brightness brightness max_brightness -13 -13 242 [root@vpcs sony]# echo 150 > brightness But nothing changed. dmesg reports the following: [ 419.046851] sony_laptop: found handle 0x0137 (offset: 0x0b) [ 419.169874] sony_laptop: __call_snc_method: [SN07:0x000000000000020b] [ 419.169877] sony_laptop: called SN07 with 0x020b (result: 0x0000) [ 423.710466] sony_laptop: found handle 0x0137 (offset: 0x0b) [ 423.834322] sony_laptop: __call_snc_method: [SN07:0x000000000000020b] [ 423.834324] sony_laptop: called SN07 with 0x020b (result: 0x0000) [ 456.260994] sony_laptop: found handle 0x0137 (offset: 0x0b) [ 456.384772] sony_laptop: __call_snc_method: [SN07:0x000000000000020b] [ 456.384774] sony_laptop: called SN07 with 0x020b (result: 0x0000) [ 461.256523] sony_laptop: found handle 0x0137 (offset: 0x0b) [ 461.386744] sony_laptop: __call_snc_method: [SN07:0x0000000000a3010b] [ 461.386746] sony_laptop: called SN07 with 0xa3010b (result: 0x0000) Interestingly enough I can change the brightness via /sys/class/backlight/nv_backlight: [root@vpcs nv_backlight]# cat actual_brightness brightness max_brightness 100 100 100 [root@vpcs nv_backlight]# echo 50 > brightness By doing so, dmesg doesn't report anything, although the brightness is actually changing. To be honest, I don't understand what is going on here. Why are there two backlight classes? Why does one work (but isn't registered to Gnome), while the other doesn't work? I suppose that there is still something wrong with the acpi video driver, as I have to append "acpi_backlight=vendor"? Thanks so far. Hopefully you can make some sense out of this? Best regards, Karol Babioch
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