[tdebase][r14.0.x] bc08650d

kdesktop/lock/lockprocess.cc

diff --git a/kdesktop/lock/lockprocess.cc b/kdesktop/lock/lockprocess.cc

index dbe0da5..b4120f1 100644

--- a/kdesktop/lock/lockprocess.cc

+++ b/kdesktop/lock/lockprocess.cc

@@ -868,7 +868,11 @@

                 info = glXGetVisualFromFBConfig(x11Display(), fbc[j]);

                 if( info ) {

                     if (argb_visual) {

-                        if (info->depth < 32) {

+                        // Xorg can only use GPU compositing for ARGB32 8:8:8:8 visuals

+                        // Ensure the selected visual is 8 bits per RGB

+                        // Selecting a non-8-bit visual will result in stuttering and high

+                        // CPU load, while Xorg tries to composite each frame on the CPU!

+                        if ((info->depth < 32) || (info->bits_per_rgb != 8)) {

                             XFree( info );

                             info = NULL;

                             continue;

bc08650d	2018-06-24 12:41:57	Timothy Pearson
Fix kdesktop_lock screensaver stuttering on modern GPUs (cherry picked from commit 4ec011cd55856f3825672431b15c0318022c6948)
M kdesktop/lock/lockprocess.cc
kdesktop/lock/lockprocess.cc diff --git a/kdesktop/lock/lockprocess.cc b/kdesktop/lock/lockprocess.cc index dbe0da5..b4120f1 100644 --- a/kdesktop/lock/lockprocess.cc +++ b/kdesktop/lock/lockprocess.cc @@ -868,7 +868,11 @@ info = glXGetVisualFromFBConfig(x11Display(), fbc[j]); if( info ) { if (argb_visual) { - if (info->depth < 32) { + // Xorg can only use GPU compositing for ARGB32 8:8:8:8 visuals + // Ensure the selected visual is 8 bits per RGB + // Selecting a non-8-bit visual will result in stuttering and high + // CPU load, while Xorg tries to composite each frame on the CPU! + if ((info->depth < 32) \|\| (info->bits_per_rgb != 8)) { XFree( info ); info = NULL; continue;