On 20/01/2022 01:01, Ken Whitesell wrote:
On 1/19/2022 2:28 PM, Jon Turney wrote:
On 19/01/2022 00:02, Ken Whitesell wrote:
On 1/17/2022 1:29 PM, Ken Whitesell wrote:
Is there a known solution for this? (Or is it known that there is no
solution?)
Thanks for reporting this.
Any guidance, pointers, suggestions of avenues for further research,
or other information, will all be greatly appreciated.
After more research and experimentation, it appears to be related to
one of xorg-server, xorg-server-common, or xorg-server-xorg.
Installing the older version 1.20.12-1 of these packages allows the
windows to be moved between monitors without any issues. Upgrading to
the current version 21.1.3-1 creates the problems. I'm able to
replicate this behavior on two different laptops with two different
external monitors.
It seems likely that this is an unintended effect of changes in
xorg-server 21.1.0-1, trying to fix problems in this area (See [1])
Thanks for the references. I've read all the messages in the thread - I
was particularly intrigued by this comment:
wrt the font scaling issue, looking at the source, it seems that we
don't re-consider the display dpi after a WM_DISPLAYCHANGE message, but
keep on using the value determined at startup. This is probably a bug.
I'm curious enough to want to take a look at the code, but I've got no
belief that I'm going to be able to find an answer. (I'm *not* a C++
programmer. I can read it and write a little of it, but that's about
it.) I was going to start by comparing the last known-working version to
the first known-non-working version, but given that it's a major release
change, that's not likely going to be a useful approach. (I'm way out of
my league here. It's probably going to take me a long time just to get
to the point where I can even begin to explore this.)
The relevant change, which tries to fix the issue identified in that
comment, and probably introduces this issue is:
https://gitlab.freedesktop.org/jturney/xserver/-/commit/b19b6266d33f2b911dc1826ad5c03da135a39957
[...]
If I change the scaling from 125% to 100% on the laptop's display,
the problem appears until I restart Cygwin/X. Restarting Cygwin/X
shows it displaying properly, until I change the scaling again.
I could only reproduce this problem with mis-rendering when changing
the scaling on the secondary monitor.
Wow, I did a really poor job of writing that. I'm sorry.
For clarity, just in case you were unable to interpret what I meant by
what I wrote -
At start: Laptop scaling set at 125%, second monitor at 100%.
Mis-rendering occurs at start, on the second monitor only.
If I change the scaling on the laptop, while the current instance of
XWin is running - the same mis-rendering now occurs on the laptop.
Interestingly enough, if I change the laptop from 125% to 100%, the tops
are clipped as previously reported. But if I change the scaling from
125% to 150%, then the bottoms are clipped. (It kinda makes sense from
what you've written.)
If I then stop and restart XWin after having reset the scaling such that
both monitors have the same setting, then the problem doesn't appear.
Thanks for the clarification.
The laptop display is the primary monitor in all cases, correct?
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