1. Move the configuration file into /etc, to be consistent with other
configuration files created in BLFS.
2. We no longer need a separate "configure the graphic card" example
because the TearFree configuration file is already a good example.
3. Tearing issue is really not new after xf86-video-* removal. In some
xf86-video-* drivers a TearFree option is available but rarely
enabled by default (only the amdgpu driver when the output is rotated
or transformed). So this is actually the first time we document it
in BLFS.
4. It's really not difficult to observer the tearing by dragging a
window in twm, despite twm only renders the window border during
dragging.
With modesetting driver, $HOME/.local/share/xorg/Xorg.0.log contains:
[ 65817.713] (II) AIGLX: Loaded and initialized crocus
And there is no more "AIGLX error" messages.
I really don't understand what it is for. And I can run twm without it.
If someone has a good reason to use legacy fonts, please revert, but you
should at least consider marking it runtime and maybe demoting it to
optional.
Or any Qt5 app will complain:
qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in ""
Let's recommended them. On Wayland-based DEs we can export
QT_QPA_PLATFORM=wayland to avoid depending on xcb though.
It looks like we've forgotten some dependencies for Qt5 all the time.
And many dependencies of Qt5 are also needed by the alternative. I
gathered them via
readelf -d $(find -name \*.so) | grep NEEDED | grep -o '\[.*\]' |
sort | uniq | grep -v Qt 2>/dev/null
in the Qt5 alternative build directory.
In the regex we use `|` which is extended regex. So the `-r` (or `-E`,
or `--regexp-exteneded`) option is needed. We cannot squash them into
`-ir` because `-i[PREFIX]` has a special meaning: make a backup named
`tempconf[PREIX]`.
Also create an ENTITY for qt5 or qt5-alternate and use that
to specify the qt5 dependenies.
The complete KF5/plasma packages should use the full qt5 build, but
the lxqt kf5/plasma components only need qt5-alternate.
It's not really QEMU specific.
By the way, move the "additional cfg unneeded on most systems" into the
bottom of the page, and adjust it to refer modesetting driver instead of
radeon driver.
"N/A" means the hardware just does not support this feature.
Currently "Fixed pipe TCL" is N/A for all supported models,
"Geometry programs" and "Tessellation programs" are N/A for some early
supported models.
We used to assume the users to config the kernel properly in xf86 video
drivers. But (1) xf86 video drivers and mesa drivers are not one-to-one
mapping; (2) there are wayland-based DEs where no xf86 video drivers are
installed.
