From: Scott Howard <showard314@xxxxxxxxx> _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: Scott Howard <showard314@xxxxxxxxx> Acked-by: Zhang Rui <rui.zhang@xxxxxxxxx> --- drivers/acpi/video.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) Index: linux-2.6/drivers/acpi/video.c =================================================================== --- linux-2.6.orig/drivers/acpi/video.c +++ linux-2.6/drivers/acpi/video.c @@ -594,6 +594,7 @@ acpi_video_device_lcd_get_level_current( 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"; @@ -609,8 +610,15 @@ acpi_video_device_lcd_get_level_current( } *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? -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
