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f70ac0e965
linux/drivers/acpi
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Danny Kukawka f70ac0e965 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>
2007-07-03 01:33:53 -04:00
..
dispatcher ACPICA: fix AML mutex re-entrancy 2007-02-15 16:13:16 -05:00
events ACPICA: revert "acpi_serialize" changes 2007-03-15 04:10:36 -04:00
executer ACPICA: revert "acpi_serialize" changes 2007-03-15 04:10:36 -04:00
hardware ACPI: resolve HP nx6125 S3 immediate wakeup regression 2007-03-12 14:49:26 -04:00
namespace ACPICA: revert "acpi_serialize" changes 2007-03-15 04:10:36 -04:00
parser ACPICA: Update copyright to 2007. 2007-02-02 21:14:31 -05:00
resources ACPI: fix boot hang w/o "noapic" on MSI MS-6390-L 2007-03-08 03:42:42 -05:00
sleep ACPI wakeup hooks for rtc-cmos 2007-05-08 11:15:18 -07:00
tables ACPICA: clear fields reserved before FADT r3 2007-04-28 20:55:06 -04:00
utilities ACPICA: fix AML mutex re-entrancy 2007-02-15 16:13:16 -05:00
ac.c ACPI: delete extra #defines in /drivers/acpi/ drivers 2007-02-12 23:50:52 -05:00
acpi_memhotplug.c ACPI: Remove duplicate definitions for _STA bits 2007-04-25 14:17:39 -04:00
asus_acpi.c backlight: Separate backlight properties from backlight ops pointers 2007-02-20 09:26:53 +00:00
battery.c Pull bugzilla-7200 into release branch 2007-02-16 22:11:37 -05:00
bay.c Pull fluff into release branch 2007-02-16 22:10:32 -05:00
blacklist.c ACPI: make blacklist more verbose 2007-03-09 21:19:05 -05:00
bus.c ACPI: use _STA bit names rather than 0x0F 2007-04-25 14:20:58 -04:00
button.c ACPI: delete extra #defines in /drivers/acpi/ drivers 2007-02-12 23:50:52 -05:00
cm_sbs.c ACPI: clean up ACPI_MODULE_NAME() use 2007-02-12 22:42:12 -05:00
container.c ACPI: Remove duplicate definitions for _STA bits 2007-04-25 14:17:39 -04:00
debug.c ACPI: clean up ACPI_MODULE_NAME() use 2007-02-12 22:42:12 -05:00
dock.c ACPI: dock: use NULL for pointer 2007-03-28 23:31:43 -04:00
ec.c ACPI: EC: Block queries until EC is fully initialized 2007-03-09 23:27:29 -05:00
event.c ACPI: clean up ACPI_MODULE_NAME() use 2007-02-12 22:42:12 -05:00
fan.c ACPI: delete extra #defines in /drivers/acpi/ drivers 2007-02-12 23:50:52 -05:00
glue.c workaround rtc-related acpi table bugs 2007-05-08 11:15:18 -07:00
Kconfig ACPI: video: output switch sysfs support 2007-05-09 22:44:38 -04:00
Makefile Pull sbs into release branch 2007-04-28 23:16:59 -04:00
numa.c Fix unnecesary meminit 2007-05-08 20:41:14 -07:00
osl.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
pci_bind.c ACPI: clean up ACPI_MODULE_NAME() use 2007-02-12 22:42:12 -05:00
pci_irq.c ACPI: clean up ACPI_MODULE_NAME() use 2007-02-12 22:42:12 -05:00
pci_link.c ACPI: delete extra #defines in /drivers/acpi/ drivers 2007-02-12 23:50:52 -05:00
pci_root.c ACPI: delete extra #defines in /drivers/acpi/ drivers 2007-02-12 23:50:52 -05:00
power.c Pull misc-for-upstream into release branch 2007-03-09 23:19:50 -05:00
processor_core.c ACPI: Remove duplicate definitions for _STA bits 2007-04-25 14:17:39 -04:00
processor_idle.c [PATCH] x86: Log reason why TSC was marked unstable 2007-05-02 19:27:08 +02:00
processor_perflib.c [CPUFREQ] Remove deprecated /proc/acpi/processor/performance write support 2007-04-26 14:32:02 -04:00
processor_thermal.c ACPI: delete extra #defines in /drivers/acpi/ drivers 2007-02-12 23:50:52 -05:00
processor_throttling.c ACPI: delete extra #defines in /drivers/acpi/ drivers 2007-02-12 23:50:52 -05:00
sbs.c ACPI: sbs: Common interface with CM battery 2007-03-22 01:15:58 -04:00
scan.c PNPACPI sets pnpdev->dev.archdata 2007-05-08 11:15:08 -07:00
system.c ACPI: delete extra #defines in /drivers/acpi/ drivers 2007-02-12 23:50:52 -05:00
tables.c Revert "ACPI: parse 2nd MADT by default" 2007-03-30 14:16:10 -04:00
thermal.c acpi-thermal: fix mod_timer() interval 2007-04-24 08:23:08 -07:00
toshiba_acpi.c backlight: Separate backlight properties from backlight ops pointers 2007-02-20 09:26:53 +00:00
utils.c ACPI: clean up ACPI_MODULE_NAME() use 2007-02-12 22:42:12 -05:00
video.c ACPI video: Don't export sysfs backlight interface if query _BCL fail 2007-07-03 01:33:53 -04:00