text characters scrambled with xrandr and qt-4

[Sebastian Glita]

Tx,

I had indeed not enabled VRGB via `eselect fontconfig`; did also so via `rox-font`, but that didn't affect qt.

However, I can rotate normal, launch a qt application, then rotate left: this works.

Since KDE is not running, configuring QT>=4.5 is out of my hands (qtconfig seems limited).

http://www.qtsoftware.com/developer/task-tracker/index_html?method=advsearch&searchstr=subpixel&bugs=on&sugs=on&product=1&functionalarea=486&versionfound=&versionfixed=&priority=-1&status=-1&resolution=-1

http://forum.kde.org/printthread.php?tid=11298

http://labs.trolltech.com/blogs/2008/09/01/subpixel-antialiasing-on-x11/

Seba


----- Original Message ----
From: Behdad Esfahbod <behdad at behdad.org>
To: Adam Goode <adam at spicenitz.org>
Cc: Sebastian Glita <glseba at yahoo.com>; xorg at lists.freedesktop.org
Sent: Friday, March 6, 2009 9:18:13 PM
Subject: Re: text characters scrambled with xrandr and qt-4

Adam Goode wrote:
> Behdad Esfahbod wrote:
>> Sebastian Glita wrote:
>>> Hi,
>>>
>>> Maybe this is a qt-4 problem, but here it is:
>>> when:
>>>
>>> xrandr --output LVDS --rotate left
>>>
>>> and launch a QT (ver. >=4)  application text is scrambled: a multicoloured 20% first line each character.
>> Sounds like subpixel filtering using the wrong RGB order.  Which isn't
>> surprising given that you didn't change the RGB order to VRGB (or VBGR).  I'm
>> not sure how Qt picks that up other than fontconfig config files.  GNOME uses
>> XSETTINGS to propagate such things.
>>
> 
> I have also noticed this problem, and I did set to VRGB. I didn't
> realize it was related to xrandr. Time to file bugs somewhere?

Filed for GNOME:

  http://bugzilla.gnome.org/show_bug.cgi?id=574413

> Adam
>