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[client/idd] input: wait for valid keyboard LED feedback

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Do not publish the default all-off LED value until Windows supplies a
real HID output report. Treat the first all-off report as valid and
retain known state across pipe reconnects.

Serialize feedback processing with connection invalidation so a stale
message cannot restore validity after disconnect.
This commit is contained in:
Geoffrey McRae
2026-08-21 13:55:15 +10:00
parent 7ca94e8959
commit efb397bbaf
3 changed files with 23 additions and 13 deletions
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5
idd/LGIdd/ipc/CInputPipeServer.cpp
View File

@@ -636,6 +636,11 @@ bool CInputPipeServer::OnPipeMessage(
const LGInputPipeMessage& frame =
*static_cast<const LGInputPipeMessage *>(message);
CSRWExclusiveLock connectionLock(m_connectionLock);
if (!(Atomic::Load(m_state, std::memory_order_relaxed) & 1))
return true;
if (frame.magic != LG_INPUT_PIPE_MAGIC ||
frame.version != LG_INPUT_PIPE_VERSION ||
frame.type != LG_INPUT_PIPE_MESSAGE_KEYBOARD_LEDS ||

10
idd/LGInput/ipc/CInputPipeClient.cpp
View File

@@ -82,10 +82,13 @@ void CInputPipeClient::OnPipeConnected()
{
CSRWExclusiveLock lock(m_feedbackLock);
m_feedbackSequence = 0;
m_feedbackReady = SendKeyboardLEDsLocked();
if (!m_feedbackReady)
m_feedbackReady = true;
if (m_keyboardLEDsValid && !SendKeyboardLEDsLocked())
{
m_feedbackReady = false;
DEBUG_WARN("Failed to report LGInput keyboard LEDs");
}
}
DEBUG_INFO("Connected to the LGIdd input transport");
}
@@ -353,10 +356,11 @@ void CInputPipeClient::UpdateKeyboardLEDs(uint8_t leds)
leds &= mask;
CSRWExclusiveLock lock(m_feedbackLock);
if (m_keyboardLEDs == leds)
if (m_keyboardLEDsValid && m_keyboardLEDs == leds)
return;
m_keyboardLEDs = leds;
m_keyboardLEDsValid = true;
if (m_feedbackReady && !SendKeyboardLEDsLocked())
{
m_feedbackReady = false;

1
idd/LGInput/ipc/CInputPipeClient.h
View File

@@ -51,6 +51,7 @@ private:
CPipeEndpoint m_endpoint;
CSRWLock m_feedbackLock;
bool m_feedbackReady = false;
bool m_keyboardLEDsValid = false;
uint64_t m_feedbackSequence = 0;
uint8_t m_keyboardLEDs = 0;
uint64_t m_lastSequence = 0;