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| author | Hans de Goede <hdegoede@redhat.com> | 2022-06-04 17:18:05 +0300 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2022-09-03 13:17:27 +0300 |
| commit | a2ed70d0ecb11b7eb3ff14ed897cd0995c86651d (patch) | |
| tree | 622fab9c9395658b379a683c70e7f711355d2188 /drivers/acpi/video_detect.c | |
| parent | 4f04c7dc83fd4339b00421174edc8556b6bac2b1 (diff) | |
| download | linux-a2ed70d0ecb11b7eb3ff14ed897cd0995c86651d.tar.xz | |
platform/x86: toshiba_acpi: Stop using acpi_video_set_dmi_backlight_type()
acpi_video_set_dmi_backlight_type() is troublesome because it may end up
getting called after other backlight drivers have already called
acpi_video_get_backlight_type() resulting in the other drivers
already being registered even though they should not.
In case of the acpi_video backlight, acpi_video_set_dmi_backlight_type()
actually calls acpi_video_unregister_backlight() since that is often
probed earlier, leading to userspace seeing the acpi_video0 class
device being briefly available, leading to races in userspace where
udev probe-rules try to access the device and it is already gone.
In case of toshiba_acpi there are no DMI quirks to move to
acpi/video_detect.c, but it also (ab)uses it for transflective
displays. Adding transflective display support to video_detect.c would
be quite involved. But luckily there are only 2 known models with
a transflective display, so we can just add DMI quirks for those.
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Diffstat (limited to 'drivers/acpi/video_detect.c')
| -rw-r--r-- | drivers/acpi/video_detect.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c index be2fc43418af..74e2087c8ff0 100644 --- a/drivers/acpi/video_detect.c +++ b/drivers/acpi/video_detect.c @@ -191,6 +191,25 @@ static const struct dmi_system_id video_detect_dmi_table[] = { }, /* + * 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 |