Windows redrawing problems with glx and software rendering (llvmpipe)

[XoDefender]

GPU, drivers, and screen setup

name of display: :0
display: :0 screen: 0
direct rendering: Yes
Extended renderer info (GLX_MESA_query_renderer):
Vendor: Mesa/X.org (0xffffffff)
Device: llvmpipe (LLVM 15.0.6, 256 bits) (0xffffffff)
Version: 22.3.6
Accelerated: no
Video memory: 4762MB
Unified memory: yes
Preferred profile: core (0x1)
Max core profile version: 4.5
Max compat profile version: 4.5
Max GLES1 profile version: 1.1
Max GLES[23] profile version: 3.2
OpenGL vendor string: Mesa/X.org
OpenGL renderer string: llvmpipe (LLVM 15.0.6, 256 bits)
OpenGL core profile version string: 4.5 (Core Profile) Mesa 22.3.6
OpenGL core profile shading language version string: 4.50
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile

OpenGL version string: 4.5 (Compatibility Profile) Mesa 22.3.6
OpenGL shading language version string: 4.50
OpenGL context flags: (none)
OpenGL profile mask: compatibility profile

OpenGL ES profile version string: OpenGL ES 3.2 Mesa 22.3.6
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20

picom version

v10.2

Configuration:

Configuration file

shadow = true;
shadow-active = true;
shadow-radius = 10;
shadow-opacity = 0.2;
shadow-offset-x = -10;
shadow-offset-y = -7;
fading = false;
fade-in-step = 0.03;
fade-out-step = 0.03;
enable-transparency = false;
inactive-opacity = 1.0;
inactive-opacity-override = false;
focus-exclude = [ "class_g = 'Cairo-clock'" ];
opacity-rule = [ "0:_NET_WM_STATE@[0]:32a *= '_NET_WM_STATE_HIDDEN'", "0:_NET_WM_STATE@[1]:32a *= '_NET_WM_STATE_HIDDEN'", "0:_NET_WM_STATE@[2]:32a *= '_NET_WM_STATE_HIDDEN'", "0:_NET_WM_STATE@[3]:32a *= '_NET_WM_STATE_HIDDEN'", "0:_NET_WM_STATE@[4]:32a *= '_NET_WM_STATE_HIDDEN'" ];
corner-radius = 7;
rounded-corners-exclude = [ "window_type = 'dock'", "window_type = 'desktop'", "class_g ?= 'Firefox'" ];
blur-kern = "3x3box";
blur-background-exclude = [ "window_type = 'dock'", "window_type = 'desktop'", "class_g = 'firefox' && (window_type = 'popup_menu' || window_type = 'utility')", "_GTK_FRAME_EXTENTS@:c" ];
backend = "glx";
vsync = false;
dbus = false;
mark-wmwin-focused = true;
mark-ovredir-focused = true;
detect-rounded-corners = true;
detect-client-opacity = true;
use-ewmh-active-win = true;
unredir-if-possible = true;
detect-transient = true;
detect-client-leader = true;
glx-no-stencil = true;
glx-no-rebind-pixmap = true;
use-damage = true;
xrender-sync-fence = false;
no-ewmh-fullscreen = false;
log-level = "warn";
frame-opacity = 1.0;

Steps of reproduction

1. Start picom with glx backend on a virtual machine with the llvmpipe driver or with LIBGL_ALWAYS_SOFTWARE=1on a physical device
2. Hide and show a window or open a window which content dynamically changes

Expected behavior

the window redraws properly

Current Behavior

the window stops redrawing, the content updates (redraws) after window resizing

Other details

I understand that the problem is with software rendering, but it would be cool to run picom with glx and get rid of some xrender bugs even with such driver as llvmpipe. Probably, there is a way around. I will also investigate this problem by myself, so it would be great to hear any guesses, how it could be fixed)

[ivanp7]

Can confirm, I experience the same issue with llvmpipe+glx on picom v11.2

[XoDefender]

It works fine with the legacy glx backend and glx-no-rebind-pixmap = false;