[Bug 535572] [NEW] System hard locks with 2.6.33 mainline

[Ancoron Luziferis]

Public bug reported:

I'm currently using Kubuntu Lucid Alpha 3 with latest updates applied
and the more recent xorg drivers from the xorg-edgers PPA on launchpad
as this machine has a AMD/ATI Radeon HD4770 (RV740) and only the 2.6.33
kernel has the initialization fix to run this system at all (of course
vesa could be used otherwise but that is a waste of resources).

The system comes up in UMS only (KMS is still broken with this card). It
runs fine for a while and then hard locks at some point.

There is nothing in the logs. If I wouldn't run the clock at my Logitech
G15 LCD keyboard I wouldn't know when it locked up.

I monitor the system to exclude failing hardware.

Beside those hard locks I discovered some other oddities:

- KVM kernel modules (kvm, kvm-amd) doesn't load at boot time (not even with forcing them through /etc/modules)
- g15daemon starts but then just whipes away, LCD is black after that

Hardware:
- AMD Phenom II X4 955 (3.2GHz)
- 2x 2GB DDR3 RAM (1333MHz)
- Gigabyte GA-790XTA-UD4 motherboard
- AMD/ATI Radeon HD4770 (RV740)
- Dell WFP3007 30" LCD (2560x1600)
- 2x 500GB (Hitachi Deskstar T7K500, no RAID)

I've even updated the BIOS in hope that it fixes the issue.

$ lsb_release -rd
Description:    Ubuntu lucid (development branch)
Release:        10.04

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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System hard locks with 2.6.33 mainline
https://bugs.launchpad.net/bugs/535572
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