[winswitch] xpra dpi woes with a server running Ubuntu cosmic

Antoine Martin antoine at nagafix.co.uk
Thu Sep 13 15:41:54 BST 2018

On 13/09/2018 21:28, Perry E. Metzger wrote:
> On Thu, 13 Sep 2018 15:52:03 +0700 Antoine Martin
> <antoine at nagafix.co.uk> wrote:
>>> I found the values in the log. Opening up applications leads to
>>> crazy display sizes, and I saw this:
>>> 2018-09-11 20:54:07,844 client @18.265 Xpra X11 server version
>>> 2.3.2-r19729 64-b it
>>> 2018-09-11 20:54:07,845 client @18.266  running on Linux Ubuntu
>>> 18.10 cosmic 2018-09-11 20:54:07,849 DPI set to 17 x 21 (wanted
>>> 72 x 72) 2018-09-11 20:54:07,849  you may experience scaling
>>> problems, such as huge or sm all fonts, etc
>>> 2018-09-11 20:54:07,849  to fix this issue, try the dpi switch,
>>> or use a patched Xorg dummy driver  
>> Right, that's the simulated "hardware DPI" that some applications
>> use. Out of curiosity, which application misbehaved?
> Emacs. It behaved very, very badly.
>>> Is there a chance of contributing these patches upstream? It would
>>> help.  
>> That's very very unlikely to be merged upstream.
>> The DPI patch is really hackish.
> Is a less hackish version possible that upstream would take? It would
> eliminate the maintenance issue with every release.
Not in its present form. There have been talks of merging proper randr
support, but things have gone very quiet:
randr 1.5 support would allow us to configure virtual monitors.
Here's xpra's tracker ticket for this issue:

>> You can use ModulePath in xorg.conf:
>> ftp://www.x.org/pub/X11R7.7-RC1/doc/man/man5/xorg.conf.5.xhtml
>>>> As the Ubuntu 18.10 release nears, we will start pushing packages
>>>> to the beta repository, this will include the patched dummy
>>>> driver. Until then, you will need to compile the driver yourself
>>>> or use another workaround.  
>> I have started pushing packages to the xpra "cosmic" repositories,
>> including the patched dummy driver. Simply adding the repository and
>> updating should give you all you need.
> What's the correct line for my sources.list?
Place one of those in /etc/apt/sources.list.d/


>> If those packages work for you, please comment or close this ticket:
>> https://xpra.org/trac/ticket/1959
> Will do.

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