powerdevil: use X11 video mode extension as fallback for brightness control

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>

CMakeLists.txt

@@ -78,6 +78,7 @@ if(Q_WS_X11)
     add_feature_info("libXft" X11_Xft_FOUND "The X11 font API library may be used by kfontinst KCM")
     add_feature_info("libXinerama" X11_Xinerama_FOUND "The X11 XINERAMA extension library may be used by ksplash")
     add_feature_info("libXRes" X11_XRes_FOUND "The X Resource library may be used by ksysguard")
+    add_feature_info("libxf86vmode" X11_xf86vmode_FOUND "The X video mode extension library used by powerdevil")
 
     if(NOT X11_Xdamage_FOUND)
         message(FATAL_ERROR "The X11 damaged region extension library was not found. Required for compositing support in KWin.")

ConfigureChecks.cmake

@@ -64,6 +64,7 @@ macro_bool_to_01(X11_xf86misc_FOUND HAVE_XF86MISC) # kcontrol/keyboard
 macro_bool_to_01(X11_dpms_FOUND HAVE_DPMS) # powerdevil
 macro_bool_to_01(X11_XSync_FOUND HAVE_XSYNC) # kwin
 macro_bool_to_01(X11_XRes_FOUND HAVE_XRES) # ksysguard
+macro_bool_to_01(X11_xf86vmode_FOUND HAVE_XF86VMODE) # powerdevil
 
 check_function_exists(setpriority  HAVE_SETPRIORITY) # kscreenlocker 
 

appveyor.yml

@@ -15,7 +15,7 @@ build_script:
     sudo apt-get update -qq
 
     sudo apt-get install -qq cmake katie-dev katanalibs \
-        katana-baseapps xorg-dev libnm-dev libqalculate-dev \
+        katana-baseapps xorg-dev libnm-dev libqalculate-dev libxxf86vm-dev \
         libx11-xcb-dev libxcb-icccm4-dev libxcb-composite0-dev libxcb-damage0-dev \
         libxcb-xfixes0-dev libxcb-render0-dev libxcb-randr0-dev libxcb-shape0-dev \
         libxcb-shape0-dev libxcb-shm0-dev libxcb-sync-dev libxcb-image0-dev \

config-X11.h.cmake

@@ -39,3 +39,6 @@
 
 /* Define if you have the XRes extension */
 #cmakedefine HAVE_XRES 1
+
+/* Define if you have the xf86vmode extension */
+#cmakedefine HAVE_XF86VMODE

powerdevil/daemon/BackendConfig.cmake

@@ -3,9 +3,15 @@
 
 
 ########################## UPower Backend #####################################
-include_directories(${CMAKE_CURRENT_SOURCE_DIR}/backends/upower
-                    ${X11_INCLUDE_DIR}
-                    ${X11_Xrandr_INCLUDE_PATH})
+include_directories(
+    ${CMAKE_CURRENT_SOURCE_DIR}/backends/upower
+    ${X11_INCLUDE_DIR}
+    ${X11_Xrandr_INCLUDE_PATH}
+)
+
+if(X11_xf86vmode_FOUND)
+    include_directories(${X11_xf86vmode_INCLUDE_PATH})
+endif()
 
 set(powerdevilupowerbackend_SRCS
     backends/upower/upowersuspendjob.cpp
@@ -34,6 +40,11 @@ upower_kbdbacklight_interface)
 
 set(powerdevilupowerbackend_LIBS ${X11_LIBRARIES} ${QT_QTGUI_LIBRARY} ${X11_Xrandr_LIB} ${KDE4_KDEUI_LIBS})
 
+if(X11_xf86vmode_FOUND)
+    set(powerdevilupowerbackend_SRCS ${powerdevilupowerbackend_SRCS} backends/upower/xf86vmodegamma.cpp)
+    set(powerdevilupowerbackend_LIBS ${X11_Xxf86vm_LIB} ${X11_Xrandr_LIB})
+endif()
+
 ########################## Daemon variables ################################
 
 set(POWERDEVIL_BACKEND_SRCS ${powerdevilupowerbackend_SRCS})

powerdevil/daemon/backends/upower/powerdevilupowerbackend.cpp

@@ -37,6 +37,10 @@
 #include "upowersuspendjob.h"
 #include "login1suspendjob.h"
 
+#ifdef HAVE_XF86VMODE
+#include "xf86vmodegamma.h"
+#endif
+
 bool checkSystemdVersion(uint requiredVersion)
 {
 
@@ -57,8 +61,11 @@ bool checkSystemdVersion(uint requiredVersion)
 
 PowerDevilUPowerBackend::PowerDevilUPowerBackend(QObject* parent)
     : BackendInterface(parent),
-      m_brightnessControl(0), m_kbdMaxBrightness(0),
-      m_lidIsPresent(false), m_lidIsClosed(false), m_onBattery(false)
+      m_brightnessControl(0), m_randrHelper(0),
+#ifdef HAVE_XF86VMODE
+      m_gammaControl(0),
+#endif
+      m_kbdMaxBrightness(0), m_lidIsPresent(false), m_lidIsClosed(false), m_onBattery(false)
 {
 
 }
@@ -66,6 +73,9 @@ PowerDevilUPowerBackend::PowerDevilUPowerBackend(QObject* parent)
 PowerDevilUPowerBackend::~PowerDevilUPowerBackend()
 {
     delete m_brightnessControl;
+#ifdef HAVE_XF86VMODE
+    delete m_gammaControl;
+#endif
 }
 
 bool PowerDevilUPowerBackend::isAvailable()
@@ -151,6 +161,16 @@ void PowerDevilUPowerBackend::init()
         screenBrightnessAvailable = true;
     }
 
+#ifdef HAVE_XF86VMODE
+    if (!m_brightnessControl->isSupported()) {
+        m_gammaControl = new XF86VModeGamma();
+        if (m_gammaControl->isSupported()) {
+            kDebug() << "Using X Video Mode";
+            screenBrightnessAvailable = true;
+        }
+    }
+#endif
+
     // Capabilities
     setCapabilities(SignalResumeFromSuspend);
 
@@ -306,9 +326,15 @@ float PowerDevilUPowerBackend::brightness(PowerDevil::BackendInterface::Brightne
 
     if (type == Screen) {
         if (m_brightnessControl->isSupported()) {
-            //kDebug() << "Calling xrandr brightness";
+            kDebug() << "Calling XRandr brightness";
             result = m_brightnessControl->brightness();
         }
+#ifdef HAVE_XF86VMODE
+        else if (m_gammaControl->isSupported()) {
+            kDebug() << "Calling XF86VidMode gamma";
+            result = m_gammaControl->gamma();
+        }
+#endif
         kDebug() << "Screen brightness: " << result;
     } else if (type == Keyboard) {
         kDebug() << "Kbd backlight brightness: " << m_kbdBacklight->GetBrightness();
@@ -326,6 +352,11 @@ bool PowerDevilUPowerBackend::setBrightness(float brightnessValue, PowerDevil::B
         if (m_brightnessControl->isSupported()) {
             m_brightnessControl->setBrightness(brightnessValue);
             success = true;
+#ifdef HAVE_XF86VMODE
+        } else if (m_gammaControl->isSupported()) {
+            m_gammaControl->setGamma(brightnessValue);
+            success = true;
+#endif
         } else {
             success = false;
         }

powerdevil/daemon/backends/upower/powerdevilupowerbackend.h

@@ -22,6 +22,8 @@
 #ifndef POWERDEVILUPOWERBACKEND_H
 #define POWERDEVILUPOWERBACKEND_H
 
+#include <config-X11.h>
+
 #include <powerdevilbackendinterface.h>
 
 #include <QtDBus/QDBusConnection>
@@ -44,6 +46,7 @@
 class UdevHelper;
 class XRandRX11Helper;
 class XRandrBrightness;
+class XF86VModeGamma;
 
 class KDE_EXPORT PowerDevilUPowerBackend : public PowerDevil::BackendInterface
 {
@@ -88,6 +91,9 @@ private:
     QMap<BrightnessControlType, float> m_cachedBrightnessMap;
     XRandrBrightness         *m_brightnessControl;
     XRandRX11Helper *m_randrHelper;
+#ifdef HAVE_XF86VMODE
+    XF86VModeGamma *m_gammaControl;
+#endif
 
     OrgFreedesktopUPowerInterface *m_upowerInterface;
     OrgFreedesktopUPowerKbdBacklightInterface *m_kbdBacklight;

powerdevil/daemon/backends/upower/xf86vmodegamma.cpp

@@ -0,0 +1,108 @@
+/*  This file is part of the KDE project
+ *    Copyright (C) 2021 Ivailo Monev <xakepa10@gmail.com>
+ * 
+ *    This library is free software; you can redistribute it and/or
+ *    modify it under the terms of the GNU Library General Public
+ *    License version 2 as published by the Free Software Foundation.
+ * 
+ *    This library is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *    Library General Public License for more details.
+ * 
+ *    You should have received a copy of the GNU Library General Public License
+ *    along with this library; see the file COPYING.LIB.  If not, write to
+ *    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *    Boston, MA 02110-1301, USA.
+ * 
+ */
+
+#include <kdebug.h>
+
+#include "xf86vmodegamma.h"
+
+#include <config-X11.h>
+
+#include <string.h>
+
+// for reference:
+// https://cgit.freedesktop.org/xorg/app/xgamma/plain/xgamma.c
+
+// 50 means normal screen gamma, anything lower than that should make it darker
+// and higher should make it brighter
+static const float xgammaratio = 50.0;
+
+XF86VModeGamma::XF86VModeGamma()
+    : m_supported(false)
+{
+    int majorversion, minorversion;
+    if (!XF86VidModeQueryVersion(m_x11info.display(), &majorversion, &minorversion)) {
+        kWarning() << "XF86VidMode version query failed";
+        return;
+    }
+
+    int eventbase, errorbase;
+    if (!XF86VidModeQueryExtension(m_x11info.display(), &eventbase, &errorbase)) {
+        kWarning() << "XF86VidMode extension missing";
+        return;
+    }
+    Q_UNUSED(eventbase);
+    Q_UNUSED(errorbase);
+
+    // same version requirement as xgamma application
+    if (majorversion < 2) {
+        kWarning() << "XF86VidMode version too old" << majorversion << minorversion;
+        return;
+    }
+
+    m_supported = true;
+}
+
+XF86VModeGamma::~XF86VModeGamma()
+{
+}
+
+bool XF86VModeGamma::isSupported() const
+{
+    return m_supported;
+}
+
+float XF86VModeGamma::gamma() const
+{
+    float result = 0;
+
+    if (!m_supported) {
+        return result;
+    }
+
+    XF86VidModeGamma xgamma;
+    if (!XF86VidModeGetGamma(m_x11info.display(), m_x11info.screen(), &xgamma)) {
+        kWarning() << "Could not query gamma via XF86VidMode";
+        return result;
+    }
+    // result should be in the [0-100] range
+    result = (xgammaratio * xgamma.red * xgamma.green * xgamma.blue);
+
+    return result;
+}
+
+void XF86VModeGamma::setGamma(float gamma)
+{
+    if (!m_supported) {
+        return;
+    }
+
+    XF86VidModeGamma xgamma;
+    // in case new member is added
+    ::memset(&xgamma, 0, sizeof(XF86VidModeGamma));
+    // values should be in the [0.1-10.0] range
+    xgamma.red = (gamma / xgammaratio);
+    xgamma.green = (gamma / xgammaratio);
+    xgamma.blue = (gamma / xgammaratio);
+    if (!XF86VidModeSetGamma(m_x11info.display(), m_x11info.screen(), &xgamma)) {
+        kWarning() << "Could not set gamma via XF86VidMode";
+        return;
+    }
+
+    XSync(m_x11info.display(), False);
+}

powerdevil/daemon/backends/upower/xf86vmodegamma.h

@@ -0,0 +1,43 @@
+/*  This file is part of the KDE project
+ *    Copyright (C) 2021 Ivailo Monev <xakepa10@gmail.com>
+ * 
+ *    This library is free software; you can redistribute it and/or
+ *    modify it under the terms of the GNU Library General Public
+ *    License version 2 as published by the Free Software Foundation.
+ * 
+ *    This library is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *    Library General Public License for more details.
+ * 
+ *    You should have received a copy of the GNU Library General Public License
+ *    along with this library; see the file COPYING.LIB.  If not, write to
+ *    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *    Boston, MA 02110-1301, USA.
+ * 
+ */
+
+#ifndef XF86VMODEGAMMA_H
+#define XF86VMODEGAMMA_H
+
+#include <QtGui/qx11info_x11.h>
+
+#include <X11/Xlib.h>
+#include <X11/extensions/xf86vmode.h>
+#include <fixx11h.h>
+
+class XF86VModeGamma
+{
+public:
+    XF86VModeGamma();
+    ~XF86VModeGamma();
+    bool isSupported() const;
+    float gamma() const;
+    void setGamma(float gamma);
+
+private:
+    bool m_supported;
+    QX11Info m_x11info;
+};
+
+#endif // XF86VMODEGAMMA_H

powerdevil/daemon/backends/upower/xlibandxrandr.h

@@ -23,11 +23,7 @@ extern "C"
 {
 #include <X11/Xlib.h>
 #include <X11/Xatom.h>
-#define INT8 _X11INT8
-#define INT32 _X11INT32
 #include <X11/Xproto.h>
-#undef INT8
-#undef INT32
 #include <X11/extensions/Xrandr.h>
 }
 

powerdevil/daemon/backends/upower/xrandrbrightness.cpp

@@ -17,13 +17,14 @@
  * 
  */
 
+#include <kdebug.h>
+
 #include "xrandrbrightness.h"
 
 #include <config-X11.h>
 
 #include <stdio.h>
 #include <stdlib.h>
-
 #include <ctype.h>
 #include <string.h>
 #include <unistd.h>
@@ -33,15 +34,13 @@ XRandrBrightness::XRandrBrightness()
 {
     // init
     int major, minor;
-    if (!XRRQueryVersion (QX11Info::display(), &major, &minor))
-    {
-        qWarning("RandR extension missing");
+    if (!XRRQueryVersion (QX11Info::display(), &major, &minor)) {
+        kWarning() << "RandR extension missing";
         return;
     }
 
-    if (major < 1 || (major == 1 && minor < 2))
-    {
-        qWarning("RandR version %d.%d too old", major, minor);
+    if (major < 1 || (major == 1 && minor < 2)) {
+        kWarning() << "RandR version %d.%d too old" << major << minor;
         return;
     }
 
@@ -49,17 +48,15 @@ XRandrBrightness::XRandrBrightness()
     if (m_backlight == None)
         m_backlight = XInternAtom(QX11Info::display(), "BACKLIGHT", True);  // try with legacy atom
 
-    if (m_backlight == None)
-    {
-        qWarning("No outputs have backlight property");
+    if (m_backlight == None) {
+        kWarning() << "No outputs have backlight property";
         return;
     }
 
     m_resources = XRRGetScreenResources(QX11Info::display(), QX11Info::appRootWindow());
 
-    if (!m_resources)
-    {
-        qWarning("No available Randr resources");
+    if (!m_resources) {
+        kWarning() << "No available Randr resources";
         return;
     }
 }
@@ -77,8 +74,7 @@ bool XRandrBrightness::isSupported() const
         return false;
 
     // Verify that there are outputs that actually support backlight control...
-    for (int o = 0; o < m_resources->noutput; o++)
-    {
+    for (int o = 0; o < m_resources->noutput; o++) {
         if (backlight_get(m_resources->outputs[o]) != -1) {
             return true;
         }
@@ -91,20 +87,17 @@ float XRandrBrightness::brightness() const
 {
     float result = 0;
 
-    if (!m_resources)
+    if (!m_resources) {
         return result;
+    }
 
-    for (int o = 0; o < m_resources->noutput; o++)
-    {
+    for (int o = 0; o < m_resources->noutput; o++) {
         RROutput output = m_resources->outputs[o];
         double cur = backlight_get(output);
-        if (cur != -1)
-        {
+        if (cur != -1) {
             XRRPropertyInfo * info = XRRQueryOutputProperty(QX11Info::display(), output, m_backlight);
-            if (info)
-            {
-                if (info->range && info->num_values == 2)
-                {
+            if (info) {
+                if (info->range && info->num_values == 2) {
                     double min = info->values[0];
                     double max = info->values[1];
                     XFree(info);
@@ -126,17 +119,13 @@ void XRandrBrightness::setBrightness(float brightness)
     if (!m_resources)
         return;
 
-    for (int o = 0; o < m_resources->noutput; o++)
-    {
+    for (int o = 0; o < m_resources->noutput; o++) {
         RROutput output = m_resources->outputs[o];
         double cur = backlight_get(output);
-        if (cur != -1)
-        {
+        if (cur != -1) {
             XRRPropertyInfo * info = XRRQueryOutputProperty(QX11Info::display(), output, m_backlight);
-            if (info)
-            {
-                if (info->range && info->num_values == 2)
-                {
+            if (info) {
+                if (info->range && info->num_values == 2) {
                     double min = info->values[0];
                     double max = info->values[1];
 
@@ -164,13 +153,15 @@ long XRandrBrightness::backlight_get(RROutput output) const
     if (!m_backlight || XRRGetOutputProperty (QX11Info::display(), output, m_backlight,
                                               0, 4, False, False, None,
                                               &actual_type, &actual_format,
-                                              &nitems, &bytes_after, &prop) != Success)
+                                              &nitems, &bytes_after, &prop) != Success) {
         return -1;
+    }
 
-    if (actual_type != XA_INTEGER || nitems != 1 || actual_format != 32)
+    if (actual_type != XA_INTEGER || nitems != 1 || actual_format != 32) {
         value = -1;
-    else
+    } else {
         value = *((long *) prop);
+    }
     XFree (prop);
     return value;
 }