On 19-8-2014 3:29, Jani Nikula wrote: > 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. I tested the intel_backlight interface in linux v3.15 with the samsung backlight module blacklisted. The intel_backlight interface still works. Regards, Bertrik _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
