5b2046a...
by
Hans de Goede <email address hidden>
HID: i2c-hid: Send power-on command after reset
Before commit 67b18dfb8cfc ("HID: i2c-hid: Remove runtime power
management"), any i2c-hid touchscreens would typically be runtime-suspended
between the driver loading and Xorg or a Wayland compositor opening it,
causing it to be resumed again. This means that before this change,
we would call i2c_hid_set_power(OFF), i2c_hid_set_power(ON) before the
graphical session would start listening to the touchscreen.
It turns out that at least some SIS touchscreens, such as the one found
on the Asus T100HA, need a power-on command after reset, otherwise they
will not send any events.
Fixes: 67b18dfb8cfc ("HID: i2c-hid: Remove runtime power management")
Cc: Kai-Heng Feng <email address hidden>
Signed-off-by: Hans de Goede <email address hidden>
Signed-off-by: Jiri Kosina <email address hidden>
(cherry picked from commit 43b7029f475e7497da1de1f4a1742241812bf266)
Signed-off-by: You-Sheng Yang <email address hidden>
Runtime power management in i2c-hid brings lots of issues, such as:
- When transitioning from display manager to desktop session, i2c-hid
was closed and opened, so the device was set to SLEEP and ON in a short
period. Vendors confirmed that their devices can't handle fast ON/SLEEP
command because Windows doesn't have this behavior.
- When rebooting, i2c-hid was closed, and the driver core put the device
back to full power before shutdown. This behavior also triggers a quick
SLEEP and ON commands that some devices can't handle, renders an
unusable touchpad after reboot.
- Most importantly, my power meter reports little to none energy saving
when i2c-hid is runtime suspended.
So let's remove runtime power management since there is no actual
benefit.
Signed-off-by: Kai-Heng Feng <email address hidden>
Acked-by: Hans de Goede <email address hidden>
Signed-off-by: Benjamin Tissoires <email address hidden>
(cherry picked from commit 67b18dfb8cfc6d6c2f45ba8c546088f5c14f5bd5)
Signed-off-by: You-Sheng Yang <email address hidden>
UBUNTU: [Config] Disable TSX by default when possible
Turn on CONFIG_X86_INTEL_TSX_MODE_OFF to disable Intel's Transactional
Synchronization Extensions (TSX) feature by default. TSX can only be
disable on certain, newer processors that support the IA32_TSX_CTRL MSR
via a microcode update. Intel says that future processors will also
support the MSR. On processors that support the MSR, TSX will be
disabled unless the system administrator overrides the configuration
with the "tsx" kernel command line option.
CVE-2019-11135
Based on master commit b9665b885ab310744d8ae53d6860782ec7851613.
