Forwarding this bug from Ubuntu reporter Marek Zdražil:
http://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/565877

[Problem]
[RV530] black and white stripes at boot

[Original Description]
Sometimes i get black-white stripes at boot, screenshoot included. i reboot one or twice and boots normally. this happens usually when i first turn on computer at day.

ubuntu: lucid x64
graphics: ati radeon x1650
drivers: ati opensource

DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+5ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic x86_64
Architecture: amd64
CheckboxSubmission: 1b0c50223f1714e7a03a05f664a334e4
CheckboxSystem: daed2f3d6643b4a84b4520a2427f8c2b
Date: Sun Apr 18 12:46:55 2010
Lsusb:
 Bus 002 Device 002: ID 0458:005a KYE Systems Corp. (Mouse Systems) Enhanced Device
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-21-generic root=UUID=3443847b-6314-4238-99c5-66229f204f69 ro quiet splash
ProcEnviron:
 PATH=(custom, user)
 LANG=cs_CZ.UTF-8SourcePackage: xorg
Symptom: display
Title: Xorg freeze
dmi.bios.date: 03/07/2008
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: FI
dmi.board.name: M55S-S3
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.type: 3
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrFI:bd03/07/2008:svn:pn:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnM55S-S3:rvr:cvn:ct3:cvr:
system: codename:           lucid
 architecture:       x86_64
 kernel:             2.6.32-21-generic