GNU bug report logs - #75936
monitor width reporting

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Message #8 received at 75936 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: "david" <david <at> ngdr.net>, Po Lu <luangruo <at> yahoo.com>,
 martin rudalics <rudalics <at> gmx.at>
Cc: 75936 <at> debbugs.gnu.org
Subject: Re: bug#75936: monitor width reporting
Date: Thu, 30 Jan 2025 08:52:25 +0200

> From: "david" <david <at> ngdr.net>
> Date: Wed, 29 Jan 2025 17:03:39 -0700
> 
> This is a bug that caused me some trouble; but mainly it is FYI.  The physical
> arrangement is a laptop, which has a 4K screen, driving a single 4K screen.  I
> get (still and always) the different results below from two different Emacs
> builds.

Can you tell more about the differences between these two builds?  Are
they builds of the same Emacs version with the same configure-time
switches/options and the same versions of the development tools, or
are any of those factors different between the builds (and if so,
which ones)?

> 
> The items below are:
> 
> A: code from a startup file; the messages are debug stuff, normally absent, the
>    intention behind the code is to compute the aspect ratio of a single monitor.
> 
> B and C: output from two different Emacs builds, see ned and nut directories.
>          The different widths matter to me because I am computing a ratio that
>          later wreak havoc 8-(  The creation dates probably matter to you.
>          Other than the dates I see no way to differentiate between the builds.
> 
>  A
>   ;; Probably this is not the aspect ratio of the full screen, probably the window manager will keep
>   ;; some of the screen for itself.
>   (defconst  .emacs-monitor-aspect-ratio
>     (let  ((geometry  (assoc  'geometry  (frame-monitor-attributes  (selected-frame))) ))
>       (message  (format  "geometry   %s"  geometry))
>       (message  (format  "width      %s" (float  (nth  3  geometry))))
>       (message  (format  "height     %s" (nth  4  geometry)))
>       (message  (format  "pix width  %s" (display-pixel-width)))
>       (message  (format  "pix height %s" (display-pixel-height)))
>       (message  (format  "mm width   %s" (display-mm-width)))
>       (message  (format  "mm height  %s" (display-mm-height)))
>       (message  (format  "screens    %s" (display-screens)))
>       (message  (format  "attributes %s" (display-monitor-attributes-list)))
>       (message  (format  "frame atts  %s" (frame-monitor-attributes)))
>       (/  (float  (nth  3  geometry))
>           (nth  4  geometry)))
>     "*The ratio width/height for the current display screen, calculated in screen pixels.")
> 
>  B
>     .emacs-emacs-directory:  /home/dajo/ned/emacs-29.3/
> geometry   (geometry 0 0 3840 2160)
> width      3840.0
> height     2160
> pix width  7680
> pix height 2160
> mm width   2032
> mm height  572
> screens    1
> attributes (((name . DP-1) (geometry 0 0 3840 2160) (workarea 0 72 3840 2088) (mm-size 597 336) (frames #<frame *scratch* - GNU Emacs at Aglaea 0x559619a129a8>) (source . XRandR 1.5)) ((name . eDP-1) (geometry 3840 0 3840 2160) (workarea 3840 0 3840 2160) (mm-size 309 173) (frames) (source . XRandR 1.5)))
> frame atts  ((name . DP-1) (geometry 0 0 3840 2160) (workarea 0 72 3840 2088) (mm-size 597 336) (frames #<frame *scratch* - GNU Emacs at Aglaea 0x559619a129a8>) (source . XRandR 1.5))
> 
> Nepenthes .emacs loading in GNU Emacs 29.3 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo version 1.16.0, Xaw scroll bars)
>  of 2024-07-18.
> 
>  C
>     .emacs-emacs-directory:  /home/dajo/nut/emacs-29.3/
> geometry   (geometry 0 0 7680 2160)
> width      7680.0
> height     2160
> pix width  7680
> pix height 2160
> mm width   2032
> mm height  572
> screens    1
> attributes (((name . combined screen) (geometry 0 0 7680 2160) (workarea 0 72 7680 2088) (mm-size 2032 572) (frames #<frame *scratch* - GNU Emacs at Aglaea 0x5620435c10a8>) (source . fallback)))
> frame atts  ((name . combined screen) (geometry 0 0 7680 2160) (workarea 0 72 7680 2088) (mm-size 2032 572) (frames #<frame *scratch* - GNU Emacs at Aglaea 0x5620435c10a8>) (source . fallback))
> 
> Nepenthes .emacs loading in GNU Emacs 29.3 (build 3, x86_64-pc-linux-gnu, X toolkit, cairo version 1.16.0, Xaw scroll bars)
>  of 2025-01-29.

Looks like one of the outputs reports two separate screens, whereas
the other reports a combined screen?  If so, aren't the differences
expected?  Or what am I missing?

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