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authorDanny Kukawka <dkukawka@suse.de>2007-07-03 01:33:53 -0400
committerLen Brown <len.brown@intel.com>2007-07-03 01:33:53 -0400
commitf70ac0e9651aa8c07dffe72a44872f92054d42c3 (patch)
treec748973de21f228021e270cb5764029641d4d501 /drivers/media
parent23b0f015bf2c050b8b5399430ca64e1b3398cf76 (diff)
ACPI video: Don't export sysfs backlight interface if query _BCL fail
Currently the acpi video module export the backlight interface to sysfs also if acpi_video_device_lcd_query_levels() fails to read _BLC method (e.g. because the method is not available). In this case the userspace don't know which brightness level are supported and can't set a brightness level (echo return with: "write error: Invalid Argument"). This happend e.g. on a ASUS RF1 (correct supported by the asus-laptop module). The video module should not export the backlight interface if query _BLC fail, because you can't set anything from userspace and this make it useless. http://bugzilla.kernel.org/show_bug.cgi?id=8375 Signed-off-by: Danny Kukawka <dkukawka@suse.de> Acked-by: Luming Yu <luming.yu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/media')
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