[systemd-bugs] [Bug 87435] hwdb: Logitech, Inc. RX 250 Optical Mouse DPI data (older model)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87435

--- Comment #6 from Thomas H.P. Andersen <phomes at gmail.com> ---
That sounds reasonable. I was working on a patch for mouse-dpi-tool to show the
frequencies in a histogram. If we only really need the max frequency then
current code is fine. In my testing the mouse would use 142.9Hz ~90% of the
time. I could not find any specific steps to trigger the higher or lower
frequencies. I guess the user just has to move the mouse for a while and hope
we have found the max?

When measuring I used a blank piece of paper with some lines to indicate the
distance I want to move. For laser mice I usually get a slightly higher dpi
than the mouse was specified for. E.g. 855 from a mouse claiming to do 800. For
the optical mice I got a lot worse dpi. ~200 dpi less than the spec for my
case. Simply drawing a lot of doodles with a pen on the paper helps.

For all the mice I tested I was able to find an advertised dpi on the internet.
I just tested that I could get reasonably close to that dpi with your tool and
then used the advertised value. Does that make sense?

Nitpick: the tool truncates the frequency when creating the hwdb entry. So for
142.9Hz it will use xxx at 142.

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/systemd-bugs/attachments/20150107/809172ce/attachment.html>