On Thu, 2013-10-24 at 16:13 +0800, Aaron Lu wrote: > On 10/16/2013 07:33 AM, Rafael J. Wysocki wrote: > > On Friday, October 11, 2013 09:27:42 PM Aaron Lu wrote: > >> v5: > >> 1 Introduce video.use_native_backlight module parameter and set its > >> value to false by default as suggested by Rafael. For Win8 systems > >> which have broken ACPI video backlight control, the parameter can be > >> set to 1 in kernel cmdline to skip registering ACPI video's backlight > >> interface. Due to this change, the acpi_video_verify_backlight_support > >> is moved from video_detect.c to video.c - patch 3/4; > >> 2 Rename bd_list_head and bd_list_mutex in backlight.c to > >> backlight_dev_list and backlight_dev_list_mutex as suggested by Rafael > >> - patch 1/4. > >> > >> v4: > >> Remove decleration and stub for acpi_video_unregister_backlight in > >> video.h of patch 2/4 since that function doesn't exist anymore in v3. > >> > >> v3: > >> 1 Add a new patch 4/4 to fix some problems in thinkpad-acpi module; > >> 2 Remove unnecessary function acpi_video_unregister_backlight introduced > >> in patch 2/4 as pointed out by Jani Nikula. > >> > >> v2: > >> v1 has the subject of "Rework ACPI video driver" and is posted here: > >> http://lkml.org/lkml/2013/9/9/74 > >> Since the objective is really to fix Win8 backlight issues, I changed > >> the subject in this version, sorry about that. > >> > >> This patchset has four patches, the first introduced a new API named > >> backlight_device_registered in backlight layer that can be used for > >> backlight interface provider module to check if a specific type backlight > >> interface has been registered, see changelog for patch 1/4 for details. > >> Then patch 2/4 does the cleanup to sepeate the backlight control and > >> event delivery functionality in the ACPI video module and patch 3/4 > >> solves some Win8 backlight control problems by avoiding register ACPI > >> video's backlight interface if: > >> 1 Kernel cmdline option acpi_backlight=video is not given; > >> 2 This is a Win8 system; > >> 3 Native backlight control interface exists. > >> Patch 4/4 fixes some problems in thinkpad-acpi module. > >> > >> Technically, patch 2/4 is not required to fix the issue here. So if you > >> think it is not necessary, I can remove it from the series. > >> > >> Aaron Lu (4): > >> backlight: introduce backlight_device_registered > >> ACPI / video: seperate backlight control and event interface > >> ACPI / video: Do not register backlight if win8 and native interface > >> exists > >> thinkpad-acpi: fix handle locate for video and query of _BCL > >> > >> drivers/acpi/internal.h | 4 +- > >> drivers/acpi/video.c | 457 ++++++++++++++++++++--------------- > >> drivers/acpi/video_detect.c | 4 +- > >> drivers/platform/x86/thinkpad_acpi.c | 31 ++- > >> drivers/video/backlight/backlight.c | 31 +++ > >> include/linux/backlight.h | 4 + > >> 6 files changed, 326 insertions(+), 205 deletions(-) > > > > I've added this series to my queue for 3.13. > > > > Since the next step will be to introduce a list of systems that need > > video.use_native_backlight=1 *and* don't break in that configuration, I don't > > see much point adding another Kconfig option for the default. > > > > Hopefully, in the future we'll be able to fix the problems causing > > video.use_native_backlight=1 to fail of the systems where it fails and then > > we'll be able to make that the default behavior and drop the option altogether. > > I've prepared a patch(at the end of the mail) to set use_native_backlight > by default for some systems. There are 3 systems currently that I'm > kind of sure that should be added: > > The ThinkPad T430s and X230 is: > Reported-by: Theodore Tso <tytso@xxxxxxx> > Reported-and-tested-by: Peter Weber <bugs@xxxxxxxxxxxx> > Reported-by: Igor Gnatenko <i.gnatenko.brain@xxxxxxxxx> > Reference: https://bugzilla.kernel.org/show_bug.cgi?id=51231 > > The Lenovo Yoga is: > Reported-by: Lennart Poettering <lennart@xxxxxxxxxxxxxx> > Reference: https://lkml.org/lkml/2013/10/13/178 > > From: Aaron Lu <aaron.lu@xxxxxxxxx> > Subject: [PATCH] ACPI / video: Add systems that should favor native backlight > interface > > Some system's ACPI video backlight control interface is broken and the > native backlight control interface should be used by default. This patch > sets the use_native_backlight parameter to true for those systems so > that video backlight control interface will not be created. To be > clear, the ThinkPad T430s/X230 and Lenovo Yoga 13 are added here. > > Reported-by: Theodore Tso <tytso@xxxxxxx> > Reported-and-tested-by: Peter Weber <bugs@xxxxxxxxxxxx> > Reported-by: Lennart Poettering <lennart@xxxxxxxxxxxxxx> > Reported-by: Igor Gnatenko <i.gnatenko.brain@xxxxxxxxx> > Signed-off-by: Aaron Lu <aaron.lu@xxxxxxxxx> > --- > drivers/acpi/video.c | 30 ++++++++++++++++++++++++++++++ > 1 file changed, 30 insertions(+) > > diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c > index d020df5..9a80a94 100644 > --- a/drivers/acpi/video.c > +++ b/drivers/acpi/video.c > @@ -412,6 +412,12 @@ static int video_ignore_initial_backlight(const struct dmi_system_id *d) > return 0; > } > > +static int __init video_set_use_native_backlight(const struct dmi_system_id *d) > +{ > + use_native_backlight = true; > + return 0; > +} > + > static struct dmi_system_id video_dmi_table[] __initdata = { > /* > * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121 > @@ -504,6 +510,30 @@ static struct dmi_system_id video_dmi_table[] __initdata = { > DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"), > }, > }, > + { > + .callback = video_set_use_native_backlight, > + .ident = "ThinkPad T430s", > + .matches = { > + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), > + DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T430s"), > + }, > + }, > + { > + .callback = video_set_use_native_backlight, > + .ident = "ThinkPad X230", > + .matches = { > + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), > + DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X230"), > + }, > + }, > + { > + .callback = video_set_use_native_backlight, > + .ident = "Lenovo Yoga 13", > + .matches = { > + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), > + DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Yoga 13"), > + }, > + }, > {} > }; > Aaron, add this notebook to list. I've CC'ed owner. And I've tested this patch on my TP X230 (add as Reported-and-Tested me please) + { + .callback = video_set_use_native_backlight, + .ident = "Dell Inspiron 7520", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), + DMI_MATCH(DMI_PRODUCT_VERSION, "Inspiron 7520"), + }, + }, -- Igor Gnatenko Fedora release 20 (Heisenbug) Linux 3.11.6-300.fc20.x86_64 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
