On Tue, 19 Aug 2014, Bertrik Sikken <bertrik@xxxxxxxxx> wrote: >> On Sun, 17 Aug 2014, Bertrik Sikken <bertrik@xxxxxxxxx> wrote: >>> On 15-8-2014 3:43, Jani Nikula wrote: >>>> On Thu, 14 Aug 2014, Bertrik Sikken <bertrik@xxxxxxxxx> wrote: >>> >>>>> Attached is dmesg output from booting kernel 3.14-2 (debian unstable) >>>>> with drm.debug=0xe and the samsung_laptop module enabled, from my >>>>> Samsung N150plus netbook. >>>> >>>> Have you tried 3.15? >>> >>> I've built the v3.15 kernel (using the .config file from debian >>> unstable and doing make oldconfig). >>> >>> The backlight is at maximum brightness after boot and I can't control >>> it using the backlight buttons, nor by writing to >>> /sys/class/backlight/samsung/brightness >>> (say half the value or 1/10th of max_brightness) >>> >>> Backlight does work when writing >>> /sys/class/backlight/intel_backlight/brightness >> >> How about disabling samsung backlight module with 3.15? > > I'm not sure what you mean by that. > > As I understand it, there are three ways to control the backlight on this > netbook: using intel_backlight, samsung_laptop (using a "sabi" interface) > and acpi_video. > Backlight control using the samsung_laptop driver no longer seems to work > after the change. If I disable it (e.g. by blacklisting it), I expect it > to no longer work at all obviously. > > What do you want me to test exactly? If the intel_backlight interface works in 3.15, I presume the problem is that you have a non-functional samsung backlight interface that is preferred over intel_backlight by your userspace. BR, Jani. > > Kind regards, > Bertrik > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Jani Nikula, Intel Open Source Technology Center _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
