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I enabled KMS for my system quite a while ago, and it worked without problems. After a long pause, I did a full system update today, and Xorg is telling me this: http://sprunge.us/FIYA
(As an observation, KMS doesn't seem to be active since the resolution doesn't change during booting, which it used to do.)
I have a Radeon HD 6770.
Downgrading to 6.14 didn't help at all: KMS was apparently disabled, KDE started, but with both displays in clone mode (which couldn't be changed), and X crashed when changing to tty and back to X.
There are a couple of threads reporting problems with the update, but I don't get a segfault, just the error message "no screens found".
Last edited by larsrh (2013-01-19 16:44:22)
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Fix KMS. UMS isn't supported anymore.
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KMS early start is enabled. I followed the instructions in https://wiki.archlinux.org/index.php/Ra … _KMS_start.
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linux video depends on more things then the xf86-video-* drivers.
Others with similar problems found that using the 3.7.1-2 kernel from [testing] repo solved problems on similar radeon cards as yours.
Try switching to that kernel.
Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.
(A works at time B) && (time C > time B ) ≠ (A works at time C)
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I tried to wait until 3.7 hit 'core', but now I tried using it from 'testing'. I upgraded 'linux' and 'linux-headers' and the error persists.
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Turns out it was indeed my fault. I had a file in modprobe.d which disabled KMS, but I don't know how it got there (it was there for quite a while – maybe I just didn't notice it). Removing it solved the problem.
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