Hi I have done some testing: with ACPI_VIDEO: both alt and std interface works (SBLL/SBL2), but only while X is running (I think with ACPI_VIDEO all brighness change etc is handled by the IGD stuff in i915 which is only active if X is running) without ACPI_VIDEO: only alt interface changes brightness and it works regardless of X In both cases events for the buttons are generated and it depends on if hal/dbus and/or gnome-power-manager/kpower* is running if the the brightness get actually changed. Peter Am Samstag, den 03.01.2009, 22:57 +0000 schrieb Tony Vroon: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Peter Gruber wrote: > > Tested it on the S6410, and works as expected > > On the subject of the S6410 (and S6420, which I have), I believe I can > simplify the backlight handling a *LOT*. Peter, to confirm that, could > you tell me whether you have ACPI_VIDEO (a kernel config option) > disabled? I'm hoping for a kernel configuration of: > # CONFIG_ACPI_VIDEO is not set > > With ACPI_VIDEO disabled (a default on quite a lot of systems, as it > depends on video output switching) SBLL did indeed fail to update the > display brightness. Also, the display hotkeys failed to work. Events > were reported, but the "before" and "after" levels were always the same > value. > > After loading ACPI_VIDEO, the hotkeys came to life. Also, after looking > at the DSDT I decided to specifically disable use_alt, causing the > driver to use SBLL & GBLL instead of SBL2 & GBLS. > Display brightness continued to be controllable. (And the Fujitsu laptop > driver continues to be useful, as backlight control methods are not > present on the ACPI video device) > > So it seems to me that we should: > 1) explicitly depend on ACPI_VIDEO through Kconfig We also have to test if the ACPI_VIDEO scenario depends on DRM/DRM_I915 for the brightness handling and add a depend on those > 2) remove the use_alt framework > > Regards, > Tony V. > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v2.0.9 (GNU/Linux) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org > > iEYEARECAAYFAklf7VoACgkQp5vW4rUFj5qXigCfSsDP38ochJ7i6X3/eFiZ3SP1 > UqEAn28yGSYRBLmvWA3+vNhDSJ1ro5oS > =u1wO > -----END PGP SIGNATURE----- -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
