https://bugzilla.kernel.org/show_bug.cgi?id=39612
--- Comment #4 from Linas linas_fi@ymail.com 2012-10-21 19:31:38 --- Created an attachment (id=84201) --> (https://bugzilla.kernel.org/attachment.cgi?id=84201) Xorg log mieq
Testing with 3.6.2, radeon.no_wb=1 is still needed, although it seems a bit better. You can get -with a little difficulty- to switch virtual terminals, so it is possible to SIGINT the xserver. Interestingly, although the first startx leads to a blank screen, a second startx runs the DE without being apparently affected. ?! Booting with radeon.no_wb=1 the DE shows directly the first time, as it should.
In one failed instance, the Xorg log showed errors of «[mi] EQ overflowing.», «[mi] EQ overflow continuing. 100 events have been dropped.», «[mi] EQ overflow continuing. 200 events have been dropped.»... I am attaching this log.