From 146f0716942496f9177725725d23228601c83a90 Mon Sep 17 00:00:00 2001
From: Angelo Naselli <anaselli@linux.it>
Date: Fri, 21 Apr 2023 23:20:37 +0200
Subject: Added XFdrake option to disable (3D) hardware acceleration for some
 cards (see bug #31695)

---
 lib/Xconfig/various.pm | 42 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 41 insertions(+), 1 deletion(-)

diff --git a/lib/Xconfig/various.pm b/lib/Xconfig/various.pm
index 114390f..d19d62b 100644
--- a/lib/Xconfig/various.pm
+++ b/lib/Xconfig/various.pm
@@ -61,6 +61,11 @@ sub default {
 	if_($card->{Driver} eq 'savage', HWCursor => 1),
 	if_($card->{Driver} eq 'intel' && $isLaptop, Clone => 0),
 	if_($card->{Driver} eq 'ati' && $isLaptop, Clone => 1, BIOSHotkeys => 0),
+	if_($card->{Driver} eq 'nouveau' ||
+            $card->{Driver} eq 'nvidia' ||
+            $card->{Driver} eq 'intel' ||
+            $card->{Driver} eq 'modesetting' ||
+            $card->{Driver} eq 'amdgpu', NoAccel => 0),
 	if_(defined $clone, Clone => $clone), # overrides driver-specific default
 	if_(exists $card->{DRI_GLX}, use_DRI_GLX => $card->{DRI_GLX} && !$card->{Xinerama}),
 	if_(member($card->{Driver}, qw(i128 ati sis trident via savage)), EXA => 0), #- list taken from http://wiki.x.org/wiki/ExaStatus
@@ -85,13 +90,21 @@ sub various {
 	    Clone => 0),
 	       if_($card->{Options}{BIOSHotkeys}, 
 	    BIOSHotkeys => 1),
-	      if_($card->{Options}{AccelMethod},
+	      if_($card->{Options}{AccelMethod} && $card->{Options}{AccelMethod} ne 'none',
 	    EXA => $card->{Options}{AccelMethod} eq 'EXA'),
 	      if_($card->{Options}{ModeValidation},
 	    ForceModeDVI => 1),
 	      if_($card->{Driver} eq 'nvidia', 
 	    RenderAccel => !$card->{Options}{RenderAccel},
 	      ),
+                if_($card->{Driver} eq 'nouveau' ||
+                $card->{Driver} eq 'intel' ||
+                $card->{Driver} eq 'amdgpu',
+            NoAccel => $card->{Options}{NoAccel},),
+                if_($card->{Driver} eq 'modesetting',
+            NoAccel => $card->{Options}{AccelMethod},),
+                if_($card->{Driver} eq 'nvidia',
+            NoAccel => !$card->{Options}{Accel},),
 	    HWCursor => !$card->{Options}{SWCursor},
 	    DontZap => (configure_ServerFlag($raw_X, 'DontZap') eq 'False' ? 0 : 1),
 	    if_($card->{DRI_GLX} || $use_DRI_GLX, use_DRI_GLX => $use_DRI_GLX),
@@ -223,6 +236,30 @@ sub config {
 	}
     }
 
+    if (exists $various->{NoAccel}) {
+        if ($card->{Driver} eq 'nvidia') {
+            if ($various->{NoAccel}) {
+                $card->{Options}{Accel} = 'false';
+            } else {
+                delete $card->{Options}{Accel};
+            }
+        } elsif ($card->{Driver} eq 'modesetting') {
+            if ($various->{NoAccel}) {
+                $card->{Options}{AccelMethod} = 'none';
+            } else {
+                delete $card->{Options}{AccelMethod};
+            }
+        } elsif ($card->{Driver} eq 'nouveau' ||
+                $card->{Driver} eq 'intel' ||
+                $card->{Driver} eq 'amdgpu') {
+            if ($various->{NoAccel}) {
+                $card->{Options}{NoAccel} = 'true';
+            } else {
+                delete $card->{Options}{NoAccel};
+            }
+        }
+    }
+
     Xconfig::various::runlevel($various->{xdm} ? 5 : 3);
 }
 
@@ -275,6 +312,9 @@ sub choose {
 	  exists $various->{EXA} ?
 	{ text => N("Use EXA instead of XAA (better performance for Render and Composite)"),
 	  type => 'bool', val => \$various->{EXA} } : (),
+	  exists $various->{NoAccel} ?
+	{ text => N("Disable Hardware Acceleration"),
+	  type => 'bool', val => \$various->{NoAccel} } : (),
 	{ label => N("Graphical interface at startup"), title => 1 },
 	{ text => N("Automatically start the graphical interface (Xorg) upon booting"),
 	  type => 'bool', val => \$various->{xdm} },
-- 
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