Hi,
On 9/9/22 17:32, Hans de Goede wrote:
> Some Toshibas have a broken acpi-video interface for brightness control, so
> far these have been using a special workaround in drivers/acpi/acpi_video.c
> which gets activated by the disable_backlight_sysfs_if module-param/quirks.
>
> 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 commit makes toshiba_acpi do a HCI_SET HCI_PANEL_POWER_ON call
> on resume on the affected models, so that the (now broken)
> acpi_video disable_backlight_sysfs_if workaround will no longer
> be necessary.
>
> Note this uses HCI_PANEL_POWER_ON instead of HCI_LCD_BRIGHTNESS
> to avoid changing the configured brightness level.
>
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> Changes in v2:
> - Add a turn_on_panel_on_resume module parameter to allow overriding
> the DMI quirk based setting
I have added these 2 patches to my review-hans (soon to be for-next)
branch now.
Regards,
Hans
> ---
> drivers/platform/x86/toshiba_acpi.c | 50 +++++++++++++++++++++++++++++
> 1 file changed, 50 insertions(+)
>
> diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
> index 900ee68a4c0b..aa55ed0d029d 100644
> --- a/drivers/platform/x86/toshiba_acpi.c
> +++ b/drivers/platform/x86/toshiba_acpi.c
> @@ -23,6 +23,7 @@
> #define PROC_INTERFACE_VERSION 1
>
> #include <linux/compiler.h>
> +#include <linux/dmi.h>
> #include <linux/kernel.h>
> #include <linux/module.h>
> #include <linux/moduleparam.h>
> @@ -50,6 +51,11 @@ MODULE_AUTHOR("John Belmonte");
> MODULE_DESCRIPTION("Toshiba Laptop ACPI Extras Driver");
> MODULE_LICENSE("GPL");
>
> +int turn_on_panel_on_resume = -1;
> +module_param(turn_on_panel_on_resume, int, 0644);
> +MODULE_PARM_DESC(turn_on_panel_on_resume,
> + "Call HCI_PANEL_POWER_ON on resume (-1 = auto, 0 = no, 1 = yes");
> +
> #define TOSHIBA_WMI_EVENT_GUID "59142400-C6A3-40FA-BADB-8A2652834100"
>
> /* Scan code for Fn key on TOS1900 models */
> @@ -100,6 +106,7 @@ MODULE_LICENSE("GPL");
> #define TOS_NOT_INSTALLED 0x8e00
>
> /* Registers */
> +#define HCI_PANEL_POWER_ON 0x0002
> #define HCI_FAN 0x0004
> #define HCI_TR_BACKLIGHT 0x0005
> #define HCI_SYSTEM_EVENT 0x0016
> @@ -3002,6 +3009,43 @@ static const char *find_hci_method(acpi_handle handle)
> return NULL;
> }
>
> +/*
> + * Some Toshibas have a broken acpi-video interface for brightness control,
> + * these are quirked in drivers/acpi/video_detect.c to use the GPU native
> + * (/sys/class/backlight/intel_backlight) instead.
> + * But these need a HCI_SET call to actually turn the panel back on at resume,
> + * without this call the screen stays black at resume.
> + * Either HCI_LCD_BRIGHTNESS (used by acpi_video's _BCM) or HCI_PANEL_POWER_ON
> + * works. toshiba_acpi_resume() uses HCI_PANEL_POWER_ON to avoid changing
> + * the configured brightness level.
> + */
> +static const struct dmi_system_id turn_on_panel_on_resume_dmi_ids[] = {
> + {
> + /* Toshiba Portégé R700 */
> + /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
> + .matches = {
> + DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
> + DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
> + },
> + },
> + {
> + /* Toshiba Satellite/Portégé R830 */
> + /* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
> + /* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
> + .matches = {
> + DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
> + DMI_MATCH(DMI_PRODUCT_NAME, "R830"),
> + },
> + },
> + {
> + /* Toshiba Satellite/Portégé Z830 */
> + .matches = {
> + DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
> + DMI_MATCH(DMI_PRODUCT_NAME, "Z830"),
> + },
> + },
> +};
> +
> static int toshiba_acpi_add(struct acpi_device *acpi_dev)
> {
> struct toshiba_acpi_dev *dev;
> @@ -3144,6 +3188,9 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev)
> ret = get_fan_status(dev, &dummy);
> dev->fan_supported = !ret;
>
> + if (turn_on_panel_on_resume == -1)
> + turn_on_panel_on_resume = dmi_check_system(turn_on_panel_on_resume_dmi_ids);
> +
> toshiba_wwan_available(dev);
> if (dev->wwan_supported)
> toshiba_acpi_setup_wwan_rfkill(dev);
> @@ -3260,6 +3307,9 @@ static int toshiba_acpi_resume(struct device *device)
> rfkill_set_hw_state(dev->wwan_rfk, !dev->killswitch);
> }
>
> + if (turn_on_panel_on_resume)
> + hci_write(dev, HCI_PANEL_POWER_ON, 1);
> +
> return 0;
> }
> #endif
