diff options
| author | Danny Kukawka <dkukawka@suse.de> | 2007-07-03 05:33:53 (GMT) |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2007-07-03 05:33:53 (GMT) |
| commit | f70ac0e9651aa8c07dffe72a44872f92054d42c3 (patch) | |
| tree | c748973de21f228021e270cb5764029641d4d501 /drivers/cpufreq | |
| parent | 23b0f015bf2c050b8b5399430ca64e1b3398cf76 (diff) | |
| download | linux-fsl-qoriq-f70ac0e9651aa8c07dffe72a44872f92054d42c3.tar.xz | |
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/cpufreq')
0 files changed, 0 insertions, 0 deletions