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brightness/ddc: avoid re-probing already identified devices

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related #2049
This commit is contained in:
bbedward
2026-07-04 20:12:27 -04:00
parent 7355cc54b2
commit b01042d530
1 changed files with 8 additions and 1 deletions
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core/internal/server/brightness/ddc.go
+8 -1
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@@ -68,6 +68,12 @@ func (b *DDCBackend) scanI2CDevicesInternal(force bool) error {
activeBuses[i] = true activeBuses[i] = true
id := fmt.Sprintf("ddc:i2c-%d", i) id := fmt.Sprintf("ddc:i2c-%d", i)
// Don't re-probe identified monitors: DDC traffic during a wake
// sequence can disturb some monitors' own brightness handling.
if _, ok := b.devices.Load(id); ok {
continue
}
dev, err := b.probeDDCDevice(i) dev, err := b.probeDDCDevice(i)
if err != nil || dev == nil { if err != nil || dev == nil {
continue continue
@@ -107,7 +113,8 @@ func (b *DDCBackend) probeDDCDevice(bus int) (*ddcDevice, error) {
dummy := make([]byte, 32) dummy := make([]byte, 32)
syscall.Read(fd, dummy) //nolint:errcheck syscall.Read(fd, dummy) //nolint:errcheck
writebuf := []byte{0x00} writebuf := []byte{DDC_SOURCE_ADDR, 0x80}
writebuf = append(writebuf, ddcciChecksum(writebuf))
n, err := syscall.Write(fd, writebuf) n, err := syscall.Write(fd, writebuf)
if err == nil && n == len(writebuf) { if err == nil && n == len(writebuf) {
name := b.getDDCName(bus) name := b.getDDCName(bus)