Changes between Initial Version and Version 1 of xfwm4

Timestamp:

02/29/2020 04:42:45 AM (4 years ago)

Author:

ken@…

Comment:

Explain why xpresent can be a good idea

xfwm4

@@ +1 @@
+= xfwm4 =
+
+== using libxpresent ==
+
+With some AMD Zen APUs (e.g. Ryzen 2500U (Raven) and 3550M  (Picasso) xfwm4-4.14.0 produces text which is slow to render (e.g. tooltips are unreadable for a second or two, similar problems in terminals, e.g. text hard to read except when the cursor is on it. Also described as transparency artifacts.  see e.g. [https://forum.xfce.org/viewtopic.php?id=13232]
+
+The problem might only appear if the machine is a laptop, or perhaps it is related to Display Port outputs (my 2550U uses eDP according to xrandr, my 3400G desktop (Picasso) is connected to HDMI).
+
+The compositor can also get turned off, killing the desktop.
+
+Quoting from that forum, "In xfwm4, glx is the default vblank mode, but it also supports xpresent (which I believe works best for ati cards) and you can also turn it off."
+
+As a workaround, setting the vblank mode to off works (you need to be in X to do this, perhaps using a different windowmanager if the compositor has turned off and is 'sulking' - it certainly gives that impression on _my_ laptop, requiring several reboots to sort it out)
+
+{{{
+xfconf-query -c xfwm4 -p /general/vblank_mode -t string -s "off" --create
+}}}
+
+That appears to work, but setting it to xpresent is probably better, and that requires installing xpresent before xfwm4 (or rebuilding xfwm4 after installing xpresent) :
+{{{
+xfconf-query -c xfwm4 -p /general/vblank_mode -t string -s "xpresent" --create
+}}}
+
+== building xpresent ==
+
+The book currently points to source for v1.0.0, but the URL is "convoluted" with no obvious way of checking for newer versions. The homepage is apparently at [https://gitlab.freedesktop.org/xorg/lib/libxpresent] but that doesn't show any information about releases.
+
+For v1.0.0, and assuming you built X in /usr,
+{{{
+./autogen.sh --prefix=/usr &&
+make &&
+make install
+}}}
+
+
+
+[wiki:Xfce Up][[br]]
+[wiki:BlfsNotes Top]