From 052b5e034055862287a73bdc9e45ded5a7eb8c12 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Thu, 8 Sep 2022 12:39:02 +0200
Subject: If no virtual output is found, prefer a disconnected one, then
 connected

---
 src/loginrpc.cpp | 65 +++++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 53 insertions(+), 12 deletions(-)

diff --git a/src/loginrpc.cpp b/src/loginrpc.cpp
index df28600..1d36103 100644
--- a/src/loginrpc.cpp
+++ b/src/loginrpc.cpp
@@ -59,23 +59,29 @@ void LoginRpc::handleCommandV1(const QString &command)
             if (y < 720) y = 720;
             if (x > 1920) x = 1920;
             if (y > 1080) y = 1080;
-            QString name = QString("%1x%2").arg(x).arg(y);
-            mode *mode = vert_refresh(x, y, 60, 0, 0, 0);
+            QString name = QString("%1x%2_30").arg(x).arg(y);
+            mode *mode = vert_refresh(x, y, 30, 0, 0, 0);
             QProcess p;
+            p.setProcessChannelMode(QProcess::MergedChannels);
+            qDebug() << "Creating new mode via xrandr";
             QStringList newmode = QStringList() << "--verbose" << "--newmode" << name << QString::asprintf("%.2f", mode->pclk)
                                      << QString::number(mode->hr) << QString::number(mode->hss) << QString::number(mode->hse) << QString::number(mode->hfl)
                                      << QString::number(mode->vr) << QString::number(mode->vss) << QString::number(mode->vse) << QString::number(mode->vfl)
                                      << "-hsync" << "+vsync";
+            // Create mode
+            p.start("xrandr", newmode);
+            p.waitForFinished(2000);
+            //bool lowResFallback = p.exitCode() != 0;
+            p.kill();
             // Get all outputs
             QStringList setMode("--verbose");
-            p.setProcessChannelMode(QProcess::MergedChannels);
             p.start("xrandr", QStringList());
             p.waitForFinished(2000);
             QString out = QString::fromLocal8Bit(p.readAll());
             QRegularExpression re("^(\\S+)\\s.*?(\\w*connected)", QRegularExpression::MultilineOption);
             QRegularExpressionMatchIterator it = re.globalMatch(out);
             QString virtOut, evdiOut;
-            QStringList allOutputs;
+            QStringList allOutputs, disconnectedOutputs, connectedOutputs;
             while (it.hasNext()) {
                 QRegularExpressionMatch m = it.next();
                 QString output = m.captured(1);
@@ -88,6 +94,11 @@ void LoginRpc::handleCommandV1(const QString &command)
                 } else {
                     allOutputs << output;
                 }
+                if (m.captured(2) == QStringLiteral("disconnected")) {
+                    disconnectedOutputs << output;
+                } else {
+                    connectedOutputs << output;
+                }
             }
             if (virtOut.isEmpty()) {
                 virtOut = evdiOut;
@@ -102,12 +113,8 @@ void LoginRpc::handleCommandV1(const QString &command)
                 for (auto output : allOutputs) {
                     setMode << "--output" << output << "--off";
                 }
-                qDebug() << "Setting mode" << newmode;
+                qDebug() << "Setting mode" << setMode;
                 p.setProcessChannelMode(QProcess::ForwardedChannels);
-                // Create mode
-                p.start("xrandr", newmode);
-                p.waitForFinished(2000);
-                p.kill();
                 // Add to virtual output
                 p.start("xrandr", QStringList() << "--verbose" << "--addmode" << virtOut << name);
                 p.waitForFinished(2000);
@@ -122,16 +129,50 @@ void LoginRpc::handleCommandV1(const QString &command)
                 }
             }
             // Either -1 if we didn't have a virtual one, or != 0 if xrandr setting failed
+            // Now as fallback, try enabling a disconnected output only
             if (ret != 0) {
-                // Play it safe and disable all the outputs
-                qDebug() << "Ret:" << ret << "- Trying to disable all outputs";
+                qDebug() << "Ret:" << ret << "- Trying to enable one disconnected output";
+                QString dis = disconnectedOutputs.first();
                 setMode.clear();
-                setMode << "--verbose" << "--fb" << name; // Explicit framebuffer size
+                setMode << "--verbose" << "--output" << dis << "--mode" << name;
                 for (auto s : allOutputs) {
+                    if (s == dis)
+                        continue; // Not the one we need
                     setMode << "--output" << s << "--off";
                 }
+                qDebug() << "Setting mode" << setMode;
+                p.setProcessChannelMode(QProcess::ForwardedChannels);
+                // Add to output
+                p.start("xrandr", QStringList() << "--verbose" << "--addmode" << dis << name);
+                p.waitForFinished(2000);
+                p.kill();
+                // Set
                 p.start("xrandr", setMode);
                 p.waitForFinished(2000);
+                ret = p.exitCode();
+                p.kill();
+            }
+            // Now as fallback, try enabling just one connected output
+            if (ret != 0) {
+                qDebug() << "Ret:" << ret << "- Trying to enable one connected output";
+                QString conn = connectedOutputs.first();
+                setMode.clear();
+                setMode << "--verbose" << "--output" << conn << "--mode" << name;
+                for (auto s : allOutputs) {
+                    if (s == conn)
+                        continue; // Not the one we need
+                    setMode << "--output" << s << "--off";
+                }
+                qDebug() << "Setting mode" << setMode;
+                p.setProcessChannelMode(QProcess::ForwardedChannels);
+                // Add to output
+                p.start("xrandr", QStringList() << "--verbose" << "--addmode" << conn << name);
+                p.waitForFinished(2000);
+                p.kill();
+                // Set
+                p.start("xrandr", setMode);
+                p.waitForFinished(2000);
+                ret = p.exitCode();
                 p.kill();
             }
         }
-- 
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