1. 17 Jun, 2009 1 commit
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  4. 07 Nov, 2008 1 commit
    • Thomas Renninger's avatar
      ACPI video: if no ACPI backlight support, use vendor drivers · c3d6de69
      Thomas Renninger authored
      
      
      If an ACPI graphics device supports backlight brightness functions (cmp. with
      latest ACPI spec Appendix B), let the ACPI video driver control backlight and
      switch backlight control off in vendor specific ACPI drivers (asus_acpi,
      thinkpad_acpi, eeepc, fujitsu_laptop, msi_laptop, sony_laptop, acer-wmi).
      
      Currently it is possible to load above drivers and let both poke on the
      brightness HW registers, the video and vendor specific ACPI drivers -> bad.
      
      This patch provides the basic support to check for BIOS capabilities before
      driver loading time. Driver specific modifications are in separate follow up
      patches.
      
      "acpi_backlight=vendor"
      	Prever vendor driver over ACPI driver for backlight.
      "acpi_backlight=video" (default)
      	Prever ACPI driver over vendor driver for backlight.
      Signed-off-by: default avatarThomas Renninger <trenn@suse.de>
      Acked-by: default avatarZhang Rui <rui.zhang@intel.com>
      Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
      Signed-off-by: default avatarLen Brown <len.brown@intel.com>
      c3d6de69