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linux/drivers/acpi/video_detect.c
Hans de Goede c5b94f5b78 ACPI: video: Change disable_backlight_sysfs_if quirks to acpi_backlight=native 
Some Toshibas have a broken acpi-video interface for brightness control
and need a special firmware call on resume to turn the panel back on.
So far these have been using the disable_backlight_sysfs_if workaround
to deal with this.

The recent x86/acpi backlight refactoring has broken this workaround:
1. This workaround relies on acpi_video_get_backlight_type() returning
   acpi_video so that the acpi_video code actually runs; and
2. this relies on the actual native GPU driver to offer the sysfs
   backlight interface to userspace.

After the refactor this breaks since the native driver will no
longer register its backlight-device if acpi_video_get_backlight_type()
does not return native and making it return native breaks 1.

Keeping the acpi_video backlight handling on resume active, while not
using it to set the brightness, is necessary because it does a _BCM
call on resume which is necessary to turn the panel back on on resume.

Looking at the DSDT shows that this _BCM call results in a Toshiba
HCI_SET HCI_LCD_BRIGHTNESS call, which turns the panel back on.

This kind of special vendor specific handling really belongs in
the vendor specific acpi driver. An earlier patch in this series
modifies toshiba_acpi to make the necessary HCI_SET call on resume
on affected models.

With toshiba_acpi taking care of the HCI_SET call on resume,
the acpi_video code no longer needs to call _BCM on resume.

So instead of using the (now broken) disable_backlight_sysfs_if
workaround, simply setting acpi_backlight=native to disable
the broken apci-video interface is sufficient fix things now.

After this there are no more users of the disable_backlight_sysfs_if
flag and as discussed above the flag also no longer works as intended,
so remove the disable_backlight_sysfs_if flag entirely.

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Arvid Norlander <lkml@vorpal.se>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
2022-09-09 21:58:16 +02:00

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/*
* Copyright (C) 2015 Red Hat Inc.
* Hans de Goede <hdegoede@redhat.com>
* Copyright (C) 2008 SuSE Linux Products GmbH
* Thomas Renninger <trenn@suse.de>
*
* May be copied or modified under the terms of the GNU General Public License
*
* video_detect.c:
* After PCI devices are glued with ACPI devices
* acpi_get_pci_dev() can be called to identify ACPI graphics
* devices for which a real graphics card is plugged in
*
* Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B)
* are available, video.ko should be used to handle the device.
*
* Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop,
* sony_acpi,... can take care about backlight brightness.
*
* Backlight drivers can use acpi_video_get_backlight_type() to determine which
* driver should handle the backlight. RAW/GPU-driver backlight drivers must
* use the acpi_video_backlight_use_native() helper for this.
*
* If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
* this file will not be compiled and acpi_video_get_backlight_type() will
* always return acpi_backlight_vendor.
*/
#include <linux/export.h>
#include <linux/acpi.h>
#include <linux/apple-gmux.h>
#include <linux/backlight.h>
#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/platform_data/x86/nvidia-wmi-ec-backlight.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#include <acpi/video.h>
static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
static void acpi_video_parse_cmdline(void)
{
if (!strcmp("vendor", acpi_video_backlight_string))
acpi_backlight_cmdline = acpi_backlight_vendor;
if (!strcmp("video", acpi_video_backlight_string))
acpi_backlight_cmdline = acpi_backlight_video;
if (!strcmp("native", acpi_video_backlight_string))
acpi_backlight_cmdline = acpi_backlight_native;
if (!strcmp("none", acpi_video_backlight_string))
acpi_backlight_cmdline = acpi_backlight_none;
}
static acpi_status
find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
{
struct acpi_device *acpi_dev = acpi_fetch_acpi_dev(handle);
long *cap = context;
struct pci_dev *dev;
static const struct acpi_device_id video_ids[] = {
{ACPI_VIDEO_HID, 0},
{"", 0},
};
if (acpi_dev && !acpi_match_device_ids(acpi_dev, video_ids)) {
dev = acpi_get_pci_dev(handle);
if (!dev)
return AE_OK;
pci_dev_put(dev);
*cap |= acpi_is_video_device(handle);
}
return AE_OK;
}
/* This depends on ACPI_WMI which is X86 only */
#ifdef CONFIG_X86
static bool nvidia_wmi_ec_supported(void)
{
struct wmi_brightness_args args = {
.mode = WMI_BRIGHTNESS_MODE_GET,
.val = 0,
.ret = 0,
};
struct acpi_buffer buf = { (acpi_size)sizeof(args), &args };
acpi_status status;
status = wmi_evaluate_method(WMI_BRIGHTNESS_GUID, 0,
WMI_BRIGHTNESS_METHOD_SOURCE, &buf, &buf);
if (ACPI_FAILURE(status))
return false;
/*
* If brightness is handled by the EC then nvidia-wmi-ec-backlight
* should be used, else the GPU driver(s) should be used.
*/
return args.ret == WMI_BRIGHTNESS_SOURCE_EC;
}
#else
static bool nvidia_wmi_ec_supported(void)
{
return false;
}
#endif
/* Force to use vendor driver when the ACPI device is known to be
* buggy */
static int video_detect_force_vendor(const struct dmi_system_id *d)
{
acpi_backlight_dmi = acpi_backlight_vendor;
return 0;
}
static int video_detect_force_video(const struct dmi_system_id *d)
{
acpi_backlight_dmi = acpi_backlight_video;
return 0;
}
static int video_detect_force_native(const struct dmi_system_id *d)
{
acpi_backlight_dmi = acpi_backlight_native;
return 0;
}
static int video_detect_force_none(const struct dmi_system_id *d)
{
acpi_backlight_dmi = acpi_backlight_none;
return 0;
}
static const struct dmi_system_id video_detect_dmi_table[] = {
{
/* https://bugzilla.redhat.com/show_bug.cgi?id=1128309 */
.callback = video_detect_force_vendor,
/* Acer KAV80 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"),
},
},
{
.callback = video_detect_force_vendor,
/* Asus UL30VT */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
},
},
{
.callback = video_detect_force_vendor,
/* Asus UL30A */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
},
},
{
.callback = video_detect_force_vendor,
/* Asus X55U */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
DMI_MATCH(DMI_PRODUCT_NAME, "X55U"),
},
},
{
.callback = video_detect_force_vendor,
/* Asus X101CH */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"),
},
},
{
.callback = video_detect_force_vendor,
/* Asus X401U */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
DMI_MATCH(DMI_PRODUCT_NAME, "X401U"),
},
},
{
.callback = video_detect_force_vendor,
/* Asus X501U */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
DMI_MATCH(DMI_PRODUCT_NAME, "X501U"),
},
},
{
.callback = video_detect_force_vendor,
/* Asus 1015CX */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"),
},
},
{
.callback = video_detect_force_vendor,
/* GIGABYTE GB-BXBT-2807 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
DMI_MATCH(DMI_PRODUCT_NAME, "GB-BXBT-2807"),
},
},
{
.callback = video_detect_force_vendor,
/* Samsung N150/N210/N220 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
},
},
{
.callback = video_detect_force_vendor,
/* Samsung NF110/NF210/NF310 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
},
},
{
.callback = video_detect_force_vendor,
/* Samsung NC210 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
},
},
{
.callback = video_detect_force_vendor,
/* Sony VPCEH3U1E */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
},
},
{
.callback = video_detect_force_vendor,
/* Xiaomi Mi Pad 2 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
},
},
/*
* Toshiba models with Transflective display, these need to use
* the toshiba_acpi vendor driver for proper Transflective handling.
*/
{
.callback = video_detect_force_vendor,
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R500"),
},
},
{
.callback = video_detect_force_vendor,
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R600"),
},
},
/*
* These models have a working acpi_video backlight control, and using
* native backlight causes a regression where backlight does not work
* when userspace is not handling brightness key events. Disable
* native_backlight on these to fix this:
* https://bugzilla.kernel.org/show_bug.cgi?id=81691
*/
{
.callback = video_detect_force_video,
/* ThinkPad T420 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
},
},
{
.callback = video_detect_force_video,
/* ThinkPad T520 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
},
},
{
.callback = video_detect_force_video,
/* ThinkPad X201s */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
},
},
{
.callback = video_detect_force_video,
/* ThinkPad X201T */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
},
},
/* The native backlight controls do not work on some older machines */
{
/* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
.callback = video_detect_force_video,
/* HP ENVY 15 Notebook */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
},
},
{
.callback = video_detect_force_video,
/* SAMSUNG 870Z5E/880Z5E/680Z5E */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
},
},
{
.callback = video_detect_force_video,
/* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME,
"370R4E/370R4V/370R5E/3570RE/370R5V"),
},
},
{
/* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
.callback = video_detect_force_video,
/* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME,
"3570R/370R/470R/450R/510R/4450RV"),
},
},
{
/* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
.callback = video_detect_force_video,
/* SAMSUNG 670Z5E */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
},
},
{
/* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
.callback = video_detect_force_video,
/* SAMSUNG 730U3E/740U3E */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
},
},
{
/* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
.callback = video_detect_force_video,
/* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME,
"900X3C/900X3D/900X3E/900X4C/900X4D"),
},
},
{
/* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
.callback = video_detect_force_video,
/* Dell XPS14 L421X */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
},
},
{
/* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
.callback = video_detect_force_video,
/* Dell XPS15 L521X */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
},
},
{
/* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
.callback = video_detect_force_video,
/* SAMSUNG 530U4E/540U4E */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
},
},
/* https://bugs.launchpad.net/bugs/1894667 */
{
.callback = video_detect_force_video,
/* HP 635 Notebook */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
},
},
/* Non win8 machines which need native backlight nevertheless */
{
/* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
.callback = video_detect_force_native,
/* Lenovo Ideapad S405 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
},
},
{
/* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
.callback = video_detect_force_native,
/* Lenovo Ideapad Z570 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
},
},
{
.callback = video_detect_force_native,
/* Lenovo E41-25 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
},
},
{
.callback = video_detect_force_native,
/* Lenovo E41-45 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
},
},
{
/* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
.callback = video_detect_force_native,
/* Apple MacBook Pro 12,1 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
},
},
{
.callback = video_detect_force_native,
/* Dell Inspiron N4010 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"),
},
},
{
.callback = video_detect_force_native,
/* Dell Vostro V131 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
},
},
{
/* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
.callback = video_detect_force_native,
/* Dell XPS 17 L702X */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
},
},
{
.callback = video_detect_force_native,
/* Dell Precision 7510 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
},
},
{
.callback = video_detect_force_native,
/* Acer Aspire 5738z */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
DMI_MATCH(DMI_BOARD_NAME, "JV50"),
},
},
{
/* https://bugzilla.redhat.com/show_bug.cgi?id=1012674 */
.callback = video_detect_force_native,
/* Acer Aspire 5741 */
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
},
},
{
/* https://bugzilla.kernel.org/show_bug.cgi?id=42993 */
.callback = video_detect_force_native,
/* Acer Aspire 5750 */
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
},
},
{
/* https://bugzilla.kernel.org/show_bug.cgi?id=42833 */
.callback = video_detect_force_native,
/* Acer Extensa 5235 */
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"),
},
},
{
.callback = video_detect_force_native,
/* Acer TravelMate 4750 */
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
},
},
{
/* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
.callback = video_detect_force_native,
/* Acer TravelMate 5735Z */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
},
},
{
/* https://bugzilla.kernel.org/show_bug.cgi?id=36322 */
.callback = video_detect_force_native,
/* Acer TravelMate 5760 */
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"),
},
},
{
.callback = video_detect_force_native,
/* ASUSTeK COMPUTER INC. GA401 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
},
},
{
.callback = video_detect_force_native,
/* ASUSTeK COMPUTER INC. GA502 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
},
},
{
.callback = video_detect_force_native,
/* ASUSTeK COMPUTER INC. GA503 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
},
},
{
.callback = video_detect_force_native,
/* Asus UX303UB */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"),
},
},
{
.callback = video_detect_force_native,
/* Samsung N150P */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
DMI_MATCH(DMI_BOARD_NAME, "N150P"),
},
},
{
.callback = video_detect_force_native,
/* Samsung N145P/N250P/N260P */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
},
},
{
.callback = video_detect_force_native,
/* Samsung N250P */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
DMI_MATCH(DMI_BOARD_NAME, "N250P"),
},
},
/*
* These Toshibas have a broken acpi-video interface for brightness
* control. They also have an issue where the panel is off after
* suspend until a special firmware call is made to turn it back
* on. This is handled by the toshiba_acpi kernel module, so that
* module must be enabled for these models to work correctly.
*/
{
/* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
.callback = video_detect_force_native,
/* Toshiba Portégé R700 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
},
},
{
/* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
/* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
.callback = video_detect_force_native,
/* Toshiba Satellite/Portégé R830 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
DMI_MATCH(DMI_PRODUCT_NAME, "R830"),
},
},
{
.callback = video_detect_force_native,
/* Toshiba Satellite/Portégé Z830 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
DMI_MATCH(DMI_PRODUCT_NAME, "Z830"),
},
},
/*
* Desktops which falsely report a backlight and which our heuristics
* for this do not catch.
*/
{
.callback = video_detect_force_none,
/* Dell OptiPlex 9020M */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
},
},
{
.callback = video_detect_force_none,
/* MSI MS-7721 */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"),
},
},
{ },
};
/*
* Determine which type of backlight interface to use on this system,
* First check cmdline, then dmi quirks, then do autodetect.
*/
static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native)
{
static DEFINE_MUTEX(init_mutex);
static bool nvidia_wmi_ec_present;
static bool native_available;
static bool init_done;
static long video_caps;
/* Parse cmdline, dmi and acpi only once */
mutex_lock(&init_mutex);
if (!init_done) {
acpi_video_parse_cmdline();
dmi_check_system(video_detect_dmi_table);
acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX, find_video, NULL,
&video_caps, NULL);
nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
init_done = true;
}
if (native)
native_available = true;
mutex_unlock(&init_mutex);
/*
* The below heuristics / detection steps are in order of descending
* presedence. The commandline takes presedence over anything else.
*/
if (acpi_backlight_cmdline != acpi_backlight_undef)
return acpi_backlight_cmdline;
/* DMI quirks override any autodetection. */
if (acpi_backlight_dmi != acpi_backlight_undef)
return acpi_backlight_dmi;
/* Special cases such as nvidia_wmi_ec and apple gmux. */
if (nvidia_wmi_ec_present)
return acpi_backlight_nvidia_wmi_ec;
if (apple_gmux_present())
return acpi_backlight_apple_gmux;
/* On systems with ACPI video use either native or ACPI video. */
if (video_caps & ACPI_VIDEO_BACKLIGHT) {
/*
* Windows 8 and newer no longer use the ACPI video interface,
* so it often does not work. If the ACPI tables are written
* for win8 and native brightness ctl is available, use that.
*
* The native check deliberately is inside the if acpi-video
* block on older devices without acpi-video support native
* is usually not the best choice.
*/
if (acpi_osi_is_win8() && native_available)
return acpi_backlight_native;
else
return acpi_backlight_video;
}
/* No ACPI video (old hw), use vendor specific fw methods. */
return acpi_backlight_vendor;
}
enum acpi_backlight_type acpi_video_get_backlight_type(void)
{
return __acpi_video_get_backlight_type(false);
}
EXPORT_SYMBOL(acpi_video_get_backlight_type);
bool acpi_video_backlight_use_native(void)
{
return __acpi_video_get_backlight_type(true) == acpi_backlight_native;
}
EXPORT_SYMBOL(acpi_video_backlight_use_native);
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