| Message ID | 20201102205910.128241-2-alex.hung@canonical.com |
|---|---|
| State | New |
| Headers | show |
| Series | Add an OEM _OSI string to workaround auto-wakeup | expand |
diff --git a/drivers/acpi/osi.c b/drivers/acpi/osi.c index 6fce7fb..69f8820 100644 --- a/drivers/acpi/osi.c +++ b/drivers/acpi/osi.c @@ -68,6 +68,12 @@ osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = { * hybrid graphics supports. */ {"Linux-HPI-Hybrid-Graphics", true}, + /* + * Linux-Dell-USB4-Wakeup is used by BIOS to workaround auto wakeup + * on Tigerlake. This is done by skipping ALL_MONITOR_OFF when systems + * are going to s2idle. + */ + {"Linux-Dell-USB4-Wakeup", true}, }; static u32 acpi_osi_handler(acpi_string interface, u32 supported)
Some TGL systems wake up automatically from s2idle when connecting to a docking station with a monitor. The wake-up events are generated when BIOS sets ALL_MONITOR_OFF for power-saving on TGL systems. A BIOS workaround is used to skip ALL_MONITOR_OFF with an _OSI string "Linux-Dell-USB4-Wakeup". BugLink: http://bugs.launchpad.net/bugs/1902577 Signed-off-by: Alex Hung <alex.hung@canonical.com> --- drivers/acpi/osi.c | 6 ++++++ 1 file changed, 6 insertions(+)