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feat: add laptop/display brightness modulation

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daniel committed 2026-10-02 12:14:40 +02:00
1 parent ef1e69ae83
commit 7979acc2eb
34 files changed
+1308 -78
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programs/include/Api/Syscall.hpp
+9 -3
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@@ -298,8 +298,14 @@ namespace montauk::abi {
never part of a session mask, never part of "all", and never
delegated by the compositor to what it launches. */
static constexpr uint64_t CAP_COMPOSITOR = 1ULL << 13;
static constexpr uint64_t CAP_ALL = (1ULL << 14) - 1;
static constexpr uint64_t CAP_STANDARD_SESSION = CAP_POWER_REQUEST | CAP_SUSPEND;
/* Set the backlight of the active display (SYS_DISPLAYBRIGHTNESS).
A seat preference rather than display administration, so every
session holds it; CAP_DISPLAY_ADMIN keeps mode setting. Reading the
level needs nothing. */
static constexpr uint64_t CAP_BRIGHTNESS = 1ULL << 14;
static constexpr uint64_t CAP_ALL = (1ULL << 15) - 1;
static constexpr uint64_t CAP_STANDARD_SESSION =
CAP_POWER_REQUEST | CAP_SUSPEND | CAP_BRIGHTNESS;
static constexpr uint64_t CAP_ADMIN_SESSION =
CAP_STANDARD_SESSION | CAP_PROCESS_ADMIN | CAP_STORAGE_ADMIN |
CAP_RAW_STORAGE | CAP_NETWORK_ADMIN | CAP_SET_TIME | CAP_USER_ADMIN |
@@ -351,7 +357,7 @@ namespace montauk::abi {
deferred delegation, not amplification. */
static constexpr uint64_t CAP_CONSENT_ELIGIBLE =
CAP_STORAGE_ADMIN | CAP_NETWORK_ADMIN | CAP_SET_TIME |
CAP_DISPLAY_ADMIN | CAP_LOG_READ;
CAP_DISPLAY_ADMIN | CAP_LOG_READ | CAP_BRIGHTNESS;
static_assert((CAP_CONSENT_ELIGIBLE & ~CAP_ADMIN_SESSION) == 0,
"consent can only hand out authority an admin session holds");
programs/include/gui/desktop.hpp
+12
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@@ -227,6 +227,18 @@ struct DesktopState {
montauk::abi::BatteryInfo battery_info;
uint64_t battery_last_poll;
// Display brightness. Present only while the active output has a
// controllable backlight (laptop panel, or a monitor answering DDC/CI).
SvgIcon icon_brightness;
bool brightness_present;
bool brightness_popup_open;
Rect brightness_icon_rect;
int brightness_level; // 0-100, as shown on the slider
bool brightness_dragging;
int brightness_pending; // drag sample not yet sent, -1 none
uint64_t brightness_last_send;
uint64_t brightness_last_poll;
bool vol_popup_open;
Rect vol_icon_rect;
int vol_level; // 0-100
programs/include/montauk/capabilities.h
+1
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@@ -38,6 +38,7 @@ namespace caps {
{"log_read", montauk::abi::CAP_LOG_READ},
{"system_image", montauk::abi::CAP_SYSTEM_IMAGE},
{"compositor", montauk::abi::CAP_COMPOSITOR},
{"brightness", montauk::abi::CAP_BRIGHTNESS},
};
// Never implied by "all": each must be named explicitly in a grant.
programs/include/montauk/consent.h
+3 -1
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@@ -31,10 +31,12 @@ namespace consent {
"0:/os/icons/network-wired.svg"},
{montauk::abi::CAP_SET_TIME, "change the system clock and time zone",
"0:/os/icons/preferences-system-time.svg"},
{montauk::abi::CAP_DISPLAY_ADMIN, "change the screen resolution and brightness",
{montauk::abi::CAP_DISPLAY_ADMIN, "change the screen resolution",
"0:/os/icons/preferences-desktop-display.svg"},
{montauk::abi::CAP_LOG_READ, "read the system log, which can reveal what other apps and devices are doing",
"0:/os/icons/utilities-log-viewer.svg"},
{montauk::abi::CAP_BRIGHTNESS, "change the screen brightness",
"0:/os/icons/preferences-desktop-display.svg"},
};
// Fallback for a capability without its own icon.