Sometimes letters are "wrong"

Hello,

i am using OpenSuse 13.2 with Gnome. I have some bugs in font rendering which appears randomly but often. Sometimes one letter, not even umlauts, are rendered wrong. Do not know what the exact term is, but i show you in some examples.

http://i.imgur.com/FUa3IQx.png?1

In the first example is from console of course and you can see the letter ‘r’ is rendered wrong.

http://i.imgur.com/9gvkUNm.png?1

Second example is from firefox, where this bug appears the most, and the letter ‘m’ is wrong in this case.

http://i.imgur.com/Os40sdY.png?1

The last example is from firefox too, and as you can see, the letter ‘u’ in the word ‘Sperrungen’ is wrong in headline, but not in the rest of text.

All in all this is messing around with me all day. I installed ‘fontconfig-infinality’ for better fontrendering from here http://software.opensuse.org/package/fontconfig-infinality but it seems not to cause the problem, when i remove it from system, the bug is still there. Can not say if it was there after fresh system install because i used fontconfig from second day after fresh 13.2 installation.

Thank you in advance for taking time with my question,

Ace

Do you have a Radeon R7 240(250, 260) graphic card? There seems to be a problem with these and the open source radeon driver (or glamour).

See also this bug-report: https://bugs.freedesktop.org/show_bug.cgi?id=85864#c17

I have a Radeon HD7950. But it seems to be gone since i switched back from 3.17 to 3.16.6-2. Not sure by now, but i did not seen it in the last hours using the machine.

As it seems it still appears, but not as often as before. I only found two false letters the last hours working on the machine.