Hi Michael, Thanks for the additional info!
My kernel is configured as follows: *grep BACKLIGHT /usr/src/linux/.config* # CONFIG_FB_BACKLIGHT is not set CONFIG_BACKLIGHT_LCD_SUPPORT=y CONFIG_BACKLIGHT_CLASS_DEVICE=m # CONFIG_BACKLIGHT_GENERIC is not set # CONFIG_BACKLIGHT_PROGEAR is not set # CONFIG_BACKLIGHT_APPLE is not set # CONFIG_BACKLIGHT_SAHARA is not set # CONFIG_BACKLIGHT_ADP8860 is not set # CONFIG_BACKLIGHT_ADP8870 is not set # CONFIG_LEDS_TRIGGER_BACKLIGHT is not set *find /sys | grep backlight* /sys/devices/platform/sony-laptop/kbd_backlight /sys/devices/platform/sony-laptop/kbd_backlight_timeout /sys/devices/platform/sony-laptop/als_backlight_levels /sys/devices/platform/sony-laptop/als_backlight /sys/devices/pci0000:00/0000:00:02.0/backlight /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/uevent /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/subsystem /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/device /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/bl_power /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/brightness /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/actual_brightness /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/max_brightness /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/type /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/power /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/power/async /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/power/runtime_status /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/power/runtime_usage /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/power/runtime_active_kids /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/power/runtime_enabled /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/power/control /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/power/runtime_suspended_time /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/power/runtime_active_time /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/power/autosuspend_delay_ms /sys/class/backlight /sys/class/backlight/acpi_video0 /sys/module/backlight /sys/module/backlight/holders /sys/module/backlight/holders/video /sys/module/backlight/holders/sony_laptop /sys/module/backlight/initstate /sys/module/backlight/uevent /sys/module/backlight/refcnt /sys/module/video/parameters/use_bios_initial_backlight /sys/module/sony_laptop/parameters/kbd_backlight_timeout /sys/module/sony_laptop/parameters/kbd_backlight *cat /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/type *firmware *cat /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/max_brightness *8 I haven't looked hard (yet) but right now I don't understand why I don't have this "intel_backlight" class. *grep I915 /usr/src/linux/.config* CONFIG_DRM_I915=m CONFIG_DRM_I915_KMS=y *lsmod | grep i915 *i915 310048 7 drm_kms_helper 22512 1 i915 cfbcopyarea 3056 1 i915 cfbimgblt 1968 1 i915 cfbfillrect 3312 1 i915 intel_agp 9556 1 i915 intel_gtt 12664 3 i915,intel_agp video 9604 1 i915 button 3528 1 i915 So yes, the i915 module is indeed loaded... any thoughts? Best regards, Joël On Tue, Feb 14, 2012 at 8:07 PM, Michael Zugelder <[email protected]>wrote: > On Di, 2012-02-14 at 19:33 +0100, Joël Bourquard wrote: > > Hi Michael, > > > > Thanks for the hint. Indeed I was booting with "acpi_backlight=vendor". > I > > removed it and now I get brightness levels 0-8 in KDE (instead of the > 0-4) > > which matches userspace. It's still quite bad, but it's an improvement > > already. > > > > Now, I'm always running in Stamina mode - so I'll try to add the > > intel_backlight module and see what happens... > > Hi Joël, > > do you only have the acpi_video0 switches? Grepping the kernel source > makes me think intel_backlight should always be available when using the > i915 module. > > > Since removing the acpi_backlight parameter changed the KDE behavior, > maybe > > I should try to re-introduce the parameter, but with a different value in > > order to (hopefully) force it to use the Intel backlight values? Or is > it > > impossible to do? > > The documentation to the switch reads: > acpi_backlight= [HW,ACPI] > acpi_backlight=vendor > acpi_backlight=video > If set to vendor, prefer vendor specific driver > (e.g. thinkpad_acpi, sony_acpi, etc.) instead > of the ACPI video.ko driver. > > So it seems you have already tried all possibilities. > > > Michael > >
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