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| author | Vladimir Serbinenko <phcoder@gmail.com> | 2009-06-24 15:17:36 +0800 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-08-29 17:41:31 -0400 |
| commit | 4e231fa4cbd3ff53fcb7d76eccd6fd86a152a95f (patch) | |
| tree | 0c24249ed36ecba14fc35fd59dbedb1199c165f8 /drivers/acpi | |
| parent | 3b5e634103a5471d74e55d774e53db3df5c7b650 (diff) | |
| download | linux-3.10-4e231fa4cbd3ff53fcb7d76eccd6fd86a152a95f.tar.gz linux-3.10-4e231fa4cbd3ff53fcb7d76eccd6fd86a152a95f.tar.bz2 linux-3.10-4e231fa4cbd3ff53fcb7d76eccd6fd86a152a95f.zip | |
ACPI video: ignore buggy _BQC
_BQC doesn't return a value listed in _BCL method.
http://bugzilla.kernel.org/show_bug.cgi?id=13511
ingore the buggy _BQC method in this case
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Signed-off-by: Scott Howard <showard314@gmail.com>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/video.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index a0cd0c7ee9e..2020907921c 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -603,6 +603,7 @@ acpi_video_device_lcd_get_level_current(struct acpi_video_device *device, unsigned long long *level) { acpi_status status = AE_OK; + int i; if (device->cap._BQC || device->cap._BCQ) { char *buf = device->cap._BQC ? "_BQC" : "_BCQ"; @@ -618,8 +619,15 @@ acpi_video_device_lcd_get_level_current(struct acpi_video_device *device, } *level += bqc_offset_aml_bug_workaround; - device->brightness->curr = *level; - return 0; + for (i = 2; i < device->brightness->count; i++) + if (device->brightness->levels[i] == *level) { + device->brightness->curr = *level; + return 0; + } + /* BQC returned an invalid level. Stop using it. */ + ACPI_WARNING((AE_INFO, "%s returned an invalid level", + buf)); + device->cap._BQC = device->cap._BCQ = 0; } else { /* Fixme: * should we return an error or ignore this failure? |