Reproduce the issue, log in, and with the system frozen collect the
output of dmesg, your /var/log/Xorg.0.log, and your /var/log/kern.log.
Also, avivotool can be used to assist in debugging this issue.
avivotool is provided with the radeontool package, so to install it run:
sudo apt-get install radeontool
After installing it, you run it like this:
avivotool regs all > regdump_good.txt
avivotool regs all > regdump_broke.txt
Run it two times. Once when you have a working screen, and once in the
broken case (either from the tty console or logged into the sick box
remotely). Attach both of those to this bug report.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/715330
Title:
Freeze after login with KMS enabled on Radeon HD6310
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