sony-vaio-z-series team mailing list archive

[Joël Bourquard <joel.bourquard@xxxxxxxxx>]

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 <michael@xxxxxxxxxxxx>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
>
>