[maemo-developers] [maemo-developers] Using Nokia 770 in vertical mode

[From: Tapani Pälli]

ext Benno Senoner wrote:

> Hi Tapani,
>
> Tapani Pälli wrote:
>
>> It is possible to do rotations even hardware accelerated. However the
>> current UI does not scale to it well (as seen from screenshot) and
>> therefore it is not a supported feature. nchip is using software xrandr
>> but you still need to compile kernel since screen updates don't work
>> correctly otherwise ... however using software xrandr you will loose a
>> bit in performance (additional copy in memory) and quite much in memory
>> (~750kb).
>>  
>>
> interesting.
> 750kb does not seem a big problem especially if you don't plan to
> start other memory consuming apps.
>
> The question is more about speed. What kind of slow down do you think
> one would experience ?
> If it's in the order of 20% or so then it's acceptable but if it's
> more twice than slow then I think hardware acceleration would
> be definitively needed.
>

This is just a wild guess but it's much less than 20%, haven't really
measured this.

> Apart from recompiling the kernel, how do you tell the X server start
> with eg a 90degrees rotation ?
> Is that a commandline / config file option or do you need to call some
> X11 function from an X client to rotate the screen ?
>

You'll need libXrandr on the device and then just compile 'xrandr'
command line tool to use that library :
http://cvs.freedesktop.org/xapps/xrandr/

>> BTW, if people on the list do experiments on this area or have any
>> thoughts about resize/rotation, please share them at :
>> http://maemo.org/maemowiki/MaemoScalability (ScalabilityBrainStorming).
>>  
>>
> Nice, I will certainly share my findings on the mailing list / wiki if
> I manage to make it work.
>
>>>
>>> Another thing I would like to do is having the Xserver on the 770
>>> listening on port 6000 (the default x11 port) and use an xhosts
>>> file to permit a linux PC to display the output of a X11 app on the
>>> nokia. Is that possible or is the Xserver on the 770 not able to
>>> support remote connections ?
>>>   
>>
>>
>>
>>
>> X in 770 is built with '--disable-tcp-transport', so the answer is no.
>>  
>>
> Thanks.
> The  question is if the X server can be rebuilt without
> --disable-tcp-transport
>
>
> if yes, what drawbacks /limitations it has, eg if disabling tcp-transport
> was only used to save memory/cpu or because the Nokia hardware in
> general has some limitations which
> makes it hard/impossible  to use X11 forwarding. (Which I hardly
> believe).
>

The executable size is smaller and it's much more secure. You should
consider using X through ssh or using vnc.

> thanks again for all your infos,
>
> cheers,
> Benno
>

// Tapani