On 2020-12-23, Paul <
nospam@needed.invalid> wrote:
William Unruh wrote:
Have just found another difference between Plasma and XFCE. Google Earth
works in Plasma and does not work in XFCE, at least in the version I
have.
I installed Google Earth 7.3.2.5776 (64-bit)
in Plasma on Mageia 7.1 with Plasma Desktop many months ago
and it worked fine. Recently, because share in Zoom does not work on
Plasma (the clients see a flickering/tearing image) I started to use
XFCE in which Zoom and Sharing does work. Now however, Google earth
refuses to work and in fact does not start up at all. I gives me an
error message which implies it cannot authorize itself and asks me to
check my network (it is fine) and quits. Google Earth does still work
under Plasma.
Any hints anyone might have?
There are controls galore in sync-to-retrace country.
https://www.reddit.com/r/kde/comments/99ykiw/screen_tearing_with_kde/
Unfortunately that does not help with the Google Earth problem.
(It was not helped by my putting Chrome in the Subject, rather than what
I meant which was Google Earth).
The "flicker/tearing" was a very bad translation of the reality in Zoom,
in which large blocks of the window I was sharing were replaced with the desktop background at a rate of about 1to 5 times per second. This is
not really tearing (it is large blocks not individual lines, and is
replacement of those blocks with the background Desktop), nor
flickering, and is not a problem on my own machine but the computers of
others who are trying to look at the window I am sharing. On my computer
the Zoom sharing looks completely fine. No problems at all. On all of
the people who are watching my share on Zoom on their machines--
Windows, Mac, all brands of Linux with all types of video cards-- see
this block replacement of parts of the window being shared with the
Desktop background from my machine at a rate of a few per second.
Ie, when Zoom reads the window from my machine, for sending out to
others, it seems that there is a mismatch and instead of sending out the
window it is supposed to it sends out the desktop "behind" the window.
And this occurs in blocks-- each block about 1/4 of the size of the
window and it tends to be along the outer edges of the window, and the
center block is rarely replaced.
The last post in the thread mentions that Chrome is always
synchronized to retrace (to avoid tearing for things it
has control over). Now, if a source of frames from somewhere
which is not synchronous to your 60FPS refresh rate comes
along, who knows what will happen.
As I said, on my machine in Zoom everything is OK, it is others with
whom I am sharing that see this mess. It is also recorded.
Anywhaty this behaviour of Zoom is not the purpose of this thread. It is
the behaviour of Google Earth-- it refuses to start with an error
message in XFCE but works fine in Plasma.
This is an example of one of the settings, that in the
past would have fixed tearing at the whole-screen level.
I don't know if Nouveau has the same sort of setting, a
Sync to VBlank to reduce tearing.
"nvidia-settings ... disable Sync to VBlank"
I have a Intel onboard graphics
--- MBSE BBS v1.0.7.17 (GNU/Linux-x86_64)
* Origin: A noiseless patient Spider (2:250/1@fidonet)
