GNU bug report logs - #76481
31.0.50; Extreme weirdness with GDK_SCALE=

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From: Jonathan Corbet <corbet <at> lwn.net>
To: Po Lu <luangruo <at> yahoo.com>
Cc: 76481 <at> debbugs.gnu.org
Subject: bug#76481: 31.0.50; Extreme weirdness with GDK_SCALE=
Date: Sat, 22 Feb 2025 10:28:26 -0700

Po Lu <luangruo <at> yahoo.com> writes:

> Jonathan Corbet <corbet <at> lwn.net> writes:
>
>> With emacs built to use GTK, and running under Wayland...  run:
>>
>>    $ GDK_SCALE= emacs
>>
>> The result is a number of hallucinogenic effects ranging from emacs just
>> showing up as a black square on the screen to window-resizing attempts
>> setting the frame to random sizes unrelated to mouse movements.
>>
>> Things work much better without GDK_SCALE= and I can happily take that
>> out (it was put into my scripts years ago for long-forgotten reasons),
>> but other users may be tripped up by this too.
>>
>> This happens even with "emacs -q".
>
> Are you building the X11 configuration of Emacs with GTK, or the PGTK
> configuration?
>
> At all events, please place a breakpoint on xg_get_scale and ascertain
> what it returns.  I suspect an oversigt in GDK, as it appears that Emacs
> does not access this environment variable directly.

OK, if I run it normally (without GDK_SCALE=), I get this

First return, called from x_set_scroll_bar_default_width(): 32
 from xg_update_frame_menubar(): 2
 from xg_wm_set_size_hint(): 2
 from xg_frame_set_char_size(): 2

from here on it's always 2

with GDK_SCALE= :

First return, called from x_set_scroll_bar_default_width(): 16
 from xg_update_frame_menubar(): 1
 from xg_wm_set_size_hint(): 1
 from xg_frame_set_char_size(): 1

...and always 1 thereafter.

Hope that helps?

Thanks,

jon

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