backports

[Maroman]

today I upgraded (automatically) kernel to version 3.16. at the moment I have

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dpkg -l | grep linux-image
ii  linux-image-3.14-0.bpo.2-amd64          3.14.15-2~bpo70+1                  amd64        Linux 3.14 for 64-bit PCs
ii  linux-image-3.16-0.bpo.2-amd64          3.16.3-2~bpo70+1                   amd64        Linux 3.16 for 64-bit PCs
ii  linux-image-amd64                       3.16+61~bpo70+1                    amd64        Linux for 64-bit PCs (meta-package)

it's good news because there is a lot of changes (if needed) - see here. but I have a problem with brightness. it doesn't work for my radeon hd6320 graphic card. is there any problem with acpi?

with older kernel (3.14) brightness data was set /sys/class/backlight/acpi_video0/actual_brightness. so

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:~$ cat /sys/class/backlight/acpi_video0/brightness
1


(brightness is set as 1%, 5% or less is quite enough).
interesting that /sys/class/backlight/directory has two subdirectories (links)

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~$ ls /sys/class/backlight/ -lh
total 0
lrwxrwxrwx 1 root root 0 Sep 28 17:32 acpi_video0 -> ../../devices/pci0000:00/0000:00:01.0/backlight/acpi_video0
lrwxrwxrwx 1 root root 0 Sep 28 17:33 radeon_bl0 -> ../../devices/pci0000:00/0000:00:01.0/drm/card0/card0-LVDS-1/radeon_bl0


with newer kernel one can try to change brightness either by mate preferences or manually but without any sign of changes. moreover there is no first acpi link.

I wonder if it works for different graphic cards. is it general problem or only for radeon? sb knows any solution for changing brightness? at the moment I'm working on older kernel (waiting for solution) since it's not essential for me to change it. but anyhow it's a little annoying.

cheers,

[Maroman]

can anyone of U change the backlight? or is it only local (my) problem with radeon card? in my case probable there is a problem with redeontool package of acpi. but how it works for different cards? of course I'm interested in conjunction to the newest kernel (3.16.3) . works fine with any older one .

cheers,

[Maroman]

kernel 3.16.5 installed and still no backlight change possibility for my radeon card . I'm a bit afraid to experiment with property radeon drivers since there isn't the last good working kernel (3.14) in repository. hope it's maintained for next kernels (works for 3.17 in siduction cinnamon).

cheers,