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Code Packages Releases Activity

brightness: more aggressive ddc rescans on device changes

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This commit is contained in:
bbedward
2025-12-05 13:18:10 -05:00
parent ddda87c5a7
commit 2c48458384
4 changed files with 87 additions and 9 deletions
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62
core/internal/server/brightness/udev.go
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@@ -5,13 +5,18 @@ import (
"path/filepath"
"strconv"
"strings"
"sync"
"time"
"github.com/AvengeMedia/DankMaterialShell/core/internal/log"
"github.com/pilebones/go-udev/netlink"
)
type UdevMonitor struct {
stop chan struct{}
stop chan struct{}
rescanMutex sync.Mutex
rescanTimer *time.Timer
rescanPending bool
}
func NewUdevMonitor(manager *Manager) *UdevMonitor {
@@ -34,10 +39,8 @@ func (m *UdevMonitor) run(manager *Manager) {
matcher := &netlink.RuleDefinitions{
Rules: []netlink.RuleDefinition{
{Env: map[string]string{"SUBSYSTEM": "backlight"}},
// ! TODO: most drivers dont emit this for leds?
// ! inotify brightness_hw_changed works, but thn some devices dont do that...
// ! So for now the GUI just shows OSDs for leds, without reflecting actual HW value
// {Env: map[string]string{"SUBSYSTEM": "leds"}},
{Env: map[string]string{"SUBSYSTEM": "drm"}},
{Env: map[string]string{"SUBSYSTEM": "i2c"}},
},
}
if err := matcher.Compile(); err != nil {
@@ -49,7 +52,7 @@ func (m *UdevMonitor) run(manager *Manager) {
errs := make(chan error)
conn.Monitor(events, errs, matcher)
log.Info("Udev monitor started for backlight/leds events")
log.Info("Udev monitor started for backlight/drm/i2c events")
for {
select {
@@ -75,11 +78,54 @@ func (m *UdevMonitor) handleEvent(manager *Manager, event netlink.UEvent) {
sysname := filepath.Base(devpath)
action := string(event.Action)
switch subsystem {
case "drm", "i2c":
m.handleDisplayEvent(manager, action, subsystem, sysname)
case "backlight":
m.handleBacklightEvent(manager, action, sysname)
}
}
func (m *UdevMonitor) handleDisplayEvent(manager *Manager, action, subsystem, sysname string) {
switch action {
case "add", "remove", "change":
log.Debugf("Udev %s event: %s:%s - queueing DDC rescan", action, subsystem, sysname)
m.debouncedRescan(manager)
}
}
func (m *UdevMonitor) debouncedRescan(manager *Manager) {
m.rescanMutex.Lock()
defer m.rescanMutex.Unlock()
m.rescanPending = true
if m.rescanTimer != nil {
m.rescanTimer.Reset(2 * time.Second)
return
}
m.rescanTimer = time.AfterFunc(2*time.Second, func() {
m.rescanMutex.Lock()
pending := m.rescanPending
m.rescanPending = false
m.rescanMutex.Unlock()
if !pending {
return
}
log.Debug("Executing debounced DDC rescan")
manager.Rescan()
})
}
func (m *UdevMonitor) handleBacklightEvent(manager *Manager, action, sysname string) {
switch action {
case "change":
m.handleChange(manager, subsystem, sysname)
m.handleChange(manager, "backlight", sysname)
case "add", "remove":
log.Debugf("Udev %s event: %s:%s - triggering rescan", action, subsystem, sysname)
log.Debugf("Udev %s event: backlight:%s - triggering rescan", action, sysname)
manager.Rescan()
}
}