On 07/10/15 13:36, Pavel Andrejs wrote: > Hi, > first of all, please, let me know, if I am on a wrong mailing list. > This page > https://developer.ubuntu.com/en/start/ubuntu-for-devices/porting-new-device/ > lead me here. > > To the problem - I noticed this error message > > DirectionalDragArea: recognition properties are wrongly set. Gesture > recognition is impossible > > in unity8 log. I did some debugging a found that in > unity8/plugins/Ubuntu/Gestures/DirectionalDragArea.cpp there is a > method DirectionalDragArea::itemChange which calls > value.window->screen()->physicalDotsPerInch(). The last one returns a > bad value. This leads to an inf value pixelsPerMm later and disables > the gesture recognition. For now I solved this with a little hack - I > hardcoded pixelsPerMm to 306 / 25.4. With this the gesture recognition > works. I suppose I would eventually find the correct place for this > value, but some of you may have it faster :-)
Hey Pavel,
the QScreen::physicalDotsPerInch() calculation requires an accurate
value for QScreen::physicalSize(). That is supplied via qtmir/qtubuntu
by Mir.
Mir tries to get this info from the hardware, but either the hardware
doesn't know/lies, or Mir has a bug in retrieving this information.
On your device, please run this command:
sudo MIR_SOCKET=/run/mir_socket mirout
Here is the output I get on my Nexus 7:
Connected to server: <default>
Card 0: Max 2 simultaneous outputs
Output 0: Card 0, LVDS, connected, 1200x1920+0+0, used, on, 95mm x
151mm (7.0"), normal
1200x1920 60.00*+
Output 1: Card 0, DisplayPort, disconnected
where you see the physical dimensions of the display being printed. What
do you see?
-Gerry
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