From 5527d37de6da75c7ed8a619519e0962e8c785a00 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Mon, 15 Nov 2021 17:08:27 +0100
Subject: [xorg] iris driver workaround: Only required for Mesa 20.x

21.x apparently fixed all the issues that appeared with the iris driver
and hardware acceleration. Check for Mesa 20 specifically. Also use a
more refined workaround by setting an env-var that only affects the iris
driver, which saves us from checking which driver appears to be in use
by grepping the Xorg log file.
---
 .../xorg/data/etc/X11/Xsession.d/10-fix-vmware-3d  | 33 +++++++++++-----------
 1 file changed, 16 insertions(+), 17 deletions(-)

(limited to 'core/modules/xorg')

diff --git a/core/modules/xorg/data/etc/X11/Xsession.d/10-fix-vmware-3d b/core/modules/xorg/data/etc/X11/Xsession.d/10-fix-vmware-3d
index eebf51d3..e9951eb3 100644
--- a/core/modules/xorg/data/etc/X11/Xsession.d/10-fix-vmware-3d
+++ b/core/modules/xorg/data/etc/X11/Xsession.d/10-fix-vmware-3d
@@ -1,26 +1,25 @@
 #!/bin/ash
 # ^ sourced
 
-# This is required for Mesa 20.0+ for now. Starting from this version,
+# This is required for Mesa 20.x for now. Starting from this version,
 # the new "Iris" OpenGL driver has been made default for intel Gen8
 # and newer, which unfortunately completely breaks 3D acceleration with
 # VMware 15.5.6 (as of 2020-08-04 with Mesa 20.0 + Ubuntu 20.04 as base)
+# and causes severe glitches with qemu und GVT-g
+# This bug seems to be fixed in Mesa 21.x
+
+test_file="/usr/lib/x86_64-linux-gnu/dri/iris_dri.so"
+[ -s "$test_file" ] || return 0 # Driver not present, do nothing
+# Get version
+mesa_version=$( grep -aoPm1 '(?<=Mesa version )[0-9]{2}\.[0-9]' "$test_file" )
+[ -z "$mesa_version" ] && mesa_version=$( grep -aoPm1 '(?<=Mesa )[0-9]{2}\.[0-9]' "$test_file" )
+mesa_version="${mesa_version%.*}"
+[ -z "$mesa_version" ] && return 0 # No version extracted, do nothing
+[ "$mesa_version" -gt 20 ] && return 0 # Version > 20, bug fixed
+
+# <= 20.x with iris driver present, enable workaround for glitches
+export INTEL_DEBUG=norbc
+unset mesa_version test_file
 
-drivers="$( grep -Po '(?<=modules/drivers/)\S+(?=_drv\.so)' /var/log/Xorg.0.log )"
-intel=false
-other=false
-for driver in $drivers; do
-	case "$driver" in
-	ati|amdgpu|nvidia|nouveau|vmware)
-		other=true
-		;;
-	intel)
-		intel=true
-		;;
-	esac
-done
-if $intel && ! $other; then
-	export MESA_LOADER_DRIVER_OVERRIDE=i965
-fi
 true
 
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