On Wed, 2015-07-22 at 07:52 +0200, Mathieu OTHACEHE wrote: > Thinkpad X240 laptop has a working acpi_video backlight control but > using the default native backlight control, brightness keys does not > work.
Is it because the events are not sent to user space? Can you please file a bug in https://bugzilla.kernel.org/ under the ACPI/Power-Video category and attach its acpidump/dmesg there? Thanks. Regards, Aaron > > This patch force acpi_video use for this laptop by adding an > exception in > video_detect_dmi_table. > > Signed-off-by: Mathieu OTHACEHE <m.othac...@gmail.com> > --- > 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 815f75e..c4bc5f2 100644 > --- a/drivers/acpi/video_detect.c > +++ b/drivers/acpi/video_detect.c > @@ -173,6 +173,14 @@ static const struct dmi_system_id > video_detect_dmi_table[] = { > DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"), > }, > }, > + { > + .callback = video_detect_force_video, > + .ident = "ThinkPad X240", > + .matches = { > + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), > + DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X240"), > + }, > + }, > > /* The native backlight controls do not work on some older > machines */ > {
