On Fri, 24 Apr 2009, Zhang Rui wrote: > > On Acer Aspire 5720, _BQC always returns a value 9 smaller than > the actual brightness level. > Add dmi quirk for this laptop. > http://bugzilla.kernel.org/show_bug.cgi?id=13121 > > Tested-by: Maxim Levitsky <maximlevitsky@xxxxxxxxx> > Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx> > --- > drivers/acpi/video.c | 30 +++++++++++++++++++++++++++++- > 1 file changed, 29 insertions(+), 1 deletion(-) > > Index: linux-2.6/drivers/acpi/video.c > =================================================================== > --- linux-2.6.orig/drivers/acpi/video.c > +++ linux-2.6/drivers/acpi/video.c > @@ -87,6 +87,8 @@ static const struct acpi_device_id video > }; > MODULE_DEVICE_TABLE(acpi, video_device_ids); > > +static int bqc_offset; > + are there other machines with a similar bqc_offset AML bug? If no, then I'd rather this simple workaround be simpler rather than be ready for a general case that will never happen... in any case, the code/comments should be clear that this is a hideoous workaround rather than how things are supposed to work. eg call it bqc_offset_idiotic_aml_workaround or something.. thanks, -Len Brown, Intel Open Source Technology Center > static struct acpi_driver acpi_video_bus = { > .name = "video", > .class = ACPI_VIDEO_CLASS, > @@ -556,7 +558,8 @@ acpi_video_device_lcd_get_level_current( > - 3 - (*level); > *level = device->brightness->levels[*level + 2]; > > - } > + } else if (bqc_offset) > + *level += bqc_offset; > device->brightness->curr = *level; > return 0; > } else { > @@ -698,6 +701,29 @@ acpi_video_bus_DOS(struct acpi_video_bus > return status; > } > > +static int video_bqc_offset(const struct dmi_system_id *d) > +{ > + bqc_offset = 9; > + return 0; > +} > + > +static struct dmi_system_id video_dmi_table[] __initdata = { > + /* > + * Acer Aspire 5720 _BQC method is broken, > + * it always returns a value smaller than the actual brightness level > + * http://bugzilla.kernel.org/show_bug.cgi?id=13121 > + */ > + { > + .callback = video_bqc_offset, > + .ident = "Acer Aspire 5720", > + .matches = { > + DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), > + DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"), > + }, > + }, > + {} > +}; > + > /* > * Simple comparison function used to sort backlight levels. > */ > @@ -2287,6 +2313,8 @@ EXPORT_SYMBOL(acpi_video_register); > > static int __init acpi_video_init(void) > { > + dmi_check_system(video_dmi_table); > + > if (intel_opregion_present()) > return 0; > > > > -- > 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 > -- 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
