If I boot with my old setup (see attached xorg.conf) then I get an entire system crash at a black screen. Not even the SysRq keys can help to escape. That setup was still working with 1.7.7-14. Now with 7.6_1.12.3-1.2.3 I get a black screen.
Created attachment 65865 [details] xorg.conf
Created attachment 65866 [details] Xorg.0.log
You are using UMS which is no longer supported. Do you still have problems when you use KMS? If you really want to use UMS, you might try xf86-video-ati 6.14.6.
Also please attach your dmesg output.
I have not re-filed a bug report for KMS though it now got worse than ever before (mere pixel soup on both monitors, no way to start X) except downstreams (https://bugzilla.novell.com/show_bug.cgi?id=776569). Should I additionally file on kernel.org or here on freedesktop.org? (dmesg coming soon).
Created attachment 65890 [details] messages(dmesg)
Well; the power switch is the only thing that still works; no crash then ;) - we need to resolve Bug 53873 for getting the keyboard up if we want any interactive debugging.
Fortunately it is not the dual screenery that makes Xorg crash. I can boot in single screen mode without xorg.conf and then activate the second screen via xrandr. This is a bit unhandy since I will have to configure KDE for the second screen on every new boot by hand (i.e. plasma panel & icons) but there is a way to get Xorg well up and running!
Fortunately as Bug 53873 is more or less resolved I could go on to get a backtrace;: posted as own bug to make things clearer for you: *** Bug 54044 *** (The fact that it did not accept any more keyboard and mouse input had resembled a crash=).
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