Trisquel 6 live doesnt get beyond plymouth (supposedly because of radeon card)

I have a system with a radeon card and tested a 6.0 image from 25-Feb. I did see the plymouth screen working (if it's the Trisquel text plus the blue/white alternating dots) and then saw some graphical glitch as X loaded but did get to desktop.

The resolution was odd and upon inspection of /var/log/Xorg.0.log I found out that it had decided to use vesa driver instead of radeon for whatever reason. This can probably be mitigated with a xorg.conf file explicitly ordering to use radeon once installed...

My radeon card is maybe 6 year old, XPRESS 200M 5955 (PCIE).

Horgeon, you could try adding the nomodeset boot parameter to see if that does help you. (For me it's mandatory anyways for suspend to work because of the quirks required.)

By corrupted I mean exactly that. The trisquel text with the blue dots showing the progress, without any graphical theme.

My card an onboard HD3300 and this gave a lot of headache in Ubuntu 12.10 and all its derivatives, and I suppose it is because of the newer kernel or xorg that is also backported in the 25 Jan iso. In every Ubuntu system it would boot and freeze the system after a few minutes, but xorg loaded.

In that iso it didn't load at all, I still get a black screen and no xorg. Nomodeset failed aswell...

This has been fixed in the "official" iso with no backports. The problem remains on the previous ISO with kernel 3.5.