[GH-ISSUE #1212] feature request, 'xephyr-extra-params -dpi' option #829

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opened 2026-05-05 06:56:25 -06:00 by gitea-mirror · 2 comments

gitea-mirror commented

2026-05-05 06:56:25 -06:00

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Originally created by @gso on GitHub (Apr 12, 2017).
Original GitHub issue: https://github.com/netblue30/firejail/issues/1212

Xephyr by the looks is unable to determine DPI, defaulting to 75 dpi, the result being not all but some applications render text in a smaller font than with the correct DPI setting (openbox by way of an example). The X Server -dpi option fixes this. At a cursory glance it's not possible to set this from within a Xephyr display (gamma setting issue). A 'xephyr-extra-params' setting would be useful:

-dpi resolution
sets the resolution for all screens, in dots per inch. To be used when the server cannot determine the screen size(s) from the hardware.

[Edit] The command to determine the DPI of a display: xdpyinfo |grep -B2 resolution

Originally created by @gso on GitHub (Apr 12, 2017). Original GitHub issue: https://github.com/netblue30/firejail/issues/1212 `Xephyr` by the looks is unable to determine DPI, defaulting to 75 dpi, the result being not all but some applications render text in a smaller font than with the correct DPI setting (`openbox` by way of an example). The [X Server `-dpi` option](https://www.x.org/archive/X11R6.8.0/doc/Xserver.1.html) fixes this. At a cursory glance it's not possible to set this from within a `Xephyr` display (gamma setting issue). A 'xephyr-extra-params' setting would be useful: > -dpi resolution > sets the resolution for all screens, in dots per inch. To be used when the server cannot determine the screen size(s) from the hardware. [Edit] The command to determine the [DPI of a display](https://wiki.archlinux.org/index.php/xorg#Display_size_and_DPI): `xdpyinfo |grep -B2 resolution`

gitea-mirror

2026-05-05 06:56:25 -06:00

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gitea-mirror commented

2026-05-05 06:56:33 -06:00

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@netblue30 commented on GitHub (Apr 12, 2017):

I'll put a fix in for the next release, thanks.

@netblue30 commented on GitHub (Apr 12, 2017): I'll put a fix in for the next release, thanks.

gitea-mirror commented

2026-05-05 06:56:36 -06:00

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@netblue30 commented on GitHub (May 10, 2017):

Support is on mainline. Go in /etc/firejail/firejail.config and add an xpra-extra-params statement - there is a dpi example in that file but is commented out. Let me know if you run into problems.

@netblue30 commented on GitHub (May 10, 2017): Support is on mainline. Go in /etc/firejail/firejail.config and add an xpra-extra-params statement - there is a dpi example in that file but is commented out. Let me know if you run into problems.

gitea-mirror referenced this issue

2026-05-05 10:07:29 -06:00

[PR #829] [MERGED] Fix typos found by lintian #3766

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Reference: github-starred/firejail#829

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