Bug 90143 - mouse-dpi-tool hint to compute resolution is wrong
Summary: mouse-dpi-tool hint to compute resolution is wrong
Status: RESOLVED FIXED
Alias: None
Product: libevdev
Classification: Unclassified
Component: Core (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: Peter Hutterer
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Blocks:
 
Reported: 2015-04-22 17:26 UTC by rodrigo
Modified: 2015-04-23 00:39 UTC (History)
1 user (show)

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Description rodrigo 2015-04-22 17:26:25 UTC 
When running mouse-dpi-tool /dev/... it says:

If your resolution is not in the list, calculate it with:
	resolution=xxxxxx/inches, or
	resolution=xxxxxx/(mm * 25.4)

The last line, the operation to convert mm to inches is wrong, you always have more mm than inches, so you divide to convert. The correct formula is:

	resolution=xxxxxx/(mm / 25.4)

or:

	resolution=xxxxxx / mm * 25.4

or, my preferred:

	resolution=xxxxxx * 25.4 / mm
Comment 1 Lennart Poettering 2015-04-22 17:41:46 UTC 
systemd is not the right component for this I fear. 

Let's reassign this to whot, he'll take care of it! Peter?
Comment 2 Peter Hutterer 2015-04-23 00:38:54 UTC 
whoopsy. Thanks, fix pushed.


commit d26973216c71559ac08d145aebd8dec6fba14349
Author: Peter Hutterer <peter.hutterer@who-t.net>
Date:   Thu Apr 23 10:36:55 2015 +1000

    tools: fix help string for manual DPI calculation

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