Qt and toos small fonts / DPI

Hallo all,
I have compiled OE including QT4.4.3 and/or QT4.6. It works fine except on
7" LCD all fonts are very small (1-2mm) and touch screen works strange. 
It is properly calibrated via ts_calib and also ts_test works fine but
immediately when I start any QT application (including demos)it works
strange, small fonts, small buttons. I suspect maybe wrong DPI is being
calculated by QT but why. I have tried all env.variables for QWS to set the
resolution but it does not help... I use QWS for QT.

I was not able to find anything about this issue...
thanks, vlado

Check out everything again, what is involved.
Sometimes you have to be commented out.
In some files, default is 3.5".
Maybe it will help further.

problem solved, for 7" LCD (or any other screen)  QT mmWidth and mmHeight
must be used to force QT/E to calculate the correct DPI for different
physical screen size

export QWS_DISPLAY=LinuxFb:mmWidthXXX:mmHeightXXX

after this all fonts and dialogs looks pretty nice
anyhow I am struggling with toushscreen now but this is another issue, it
works but QT pointer behaves strange besides calibration

I guess the calibration is based are still on the old standards.
Depending on the inheritance must also be adjusted.

Hello ufon,
I'm not lucky as you!
Using the QWS_DISPLAY variable or using the "-display" option to run the QT
demos or example, does not make fonts and dialogs look good.

I'm using the QT4 programs compiled with Angstrom. I use:
export QWS_DISPLAY=LinuxFb:mmWidth=800:mmHeight=480; designer -qws

or:
designer -display "LinuxFb:mmWidth=800:mmHeight=480"

but with the same results.

Have you a new tips for this problem?

TIA
Clemente.

I also tried 

export QWS_DISPLAY=LinuxFb:mmWidth=800:mmHeight=480

and also

export QWS_DISPLAY=LinuxFb:mmWidth800:mmHeight480

and none of those worked

any solution?

i also have a big performance proplem on 7"

THX

You are supposed to specify REAL width and height of the display in
millimeters (hint should have been that parameter starts with mm) and NOT
number of pixels.

export QWS_DISPLAY=LinuxFB:mmWidth=155:mmHeight=95

BINGO!!!
Hello bobris,
thank you very much: I was convinced to use the pixel!

So the best ratio for my 7" is:
export QWS_DISPLAY=LinuxFB:mmWidth=310:mmHeight=190

exactly twice the physical dimension of the screen.

@SeppBauer
Yes I comfirm! Poor performance with 7" display!

THX pals, the dpi thing works perfect now,

Anybody have any idea how to fix the perfotrmance thingy? is it any better
with the new LCD and Arngström?

Seppo

greato to hear it works now, yes it is in mm not pixel
I have still problem with glitchy tousch screen in QT despite perfect
calibration in ts_cal. Could somebody sends me his TS and QT environment
variables (if it works for you)? I have angstrom baked from openembedded 
thanks, ufon

Hello ufon,
thanks again for the info.
I'm in the same situation: ts_test works very well with the touchscreen but
QT are too far to align with.

TIA 
Clemente

I have no time but next week I am going to debug it in QT/E why it works so
strange...

hi,

where did you place "export QWS_DISPLAY=LinuxFB:mmWidth=155:mmHeight=95"
???
On host befor compile qtopia? 
In /etc/init.d/rcS befor start qtopia? 
Latter does not work for me, qtopia does not start.

If you start your application from /bin/qt4 file, then 

edit /bin/qt4

find the line "export QWS_DISPLAY=:1"

and type
"export QWS_DISPLAY=LinuxFB:mmWidth=155:mmHeight=95"
after that line. Or change the original will work too..