On 10/14/2013 08:55 AM, Lennart Poettering wrote: > On the Yoga 13 the backlight control doesn't work via ACPI. (And doesn't > work either with the low-level platform driver ideapad_laptop; but > works correctly via the intel video driver). This patch hence adds the > Yoga 13 to the ACPI video detect blacklist, to make sure the broken ACPI > backlight device is never exposed to userspace. > > Note that this appears unrelated to the Windows 8 backlight issues tracked > here: > > https://bugzilla.kernel.org/show_bug.cgi?id=51231 > https://bugzilla.kernel.org/show_bug.cgi?id=60682 > > The Yoga's ACPI backlight controls work neither with nor without > acpi_osi="!Windows 2012" on the kernel command line. It appears that > backlight control via the EC simply is not available at all, regardless > whether done via ACPI or via the vendor driver. Just a side note, if the firmware of Yoga 13 has a _OSI("Windows 2012") query, then it should be solved with the patch proposed here: https://lkml.org/lkml/2013/10/11/409, Fix Win8 backlight issue. We are still discussing a proper default behaviour in that patchset. Thanks, Aaron > > Signed-off-by: Lennart Poettering <lennart@xxxxxxxxxxxxxx> > --- > drivers/acpi/video_detect.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c > index 940edbf..a88e8f7 100644 > --- a/drivers/acpi/video_detect.c > +++ b/drivers/acpi/video_detect.c > @@ -168,6 +168,14 @@ static struct dmi_system_id video_detect_dmi_table[] = { > DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"), > }, > }, > + { > + .callback = video_detect_force_vendor, > + .ident = "Lenovo Yoga 13", > + .matches = { > + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), > + DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Yoga 13"), > + }, > + }, > { }, > }; > > -- 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
