Comment 15 for bug 543045

Adding radeon.new_pll=0 to the kernel command line solved the issue for me.

So I added this (radeon.new_pll=0) for the GRUB bootloader. It's in the /etc/default/grub file in the GRUB_CMDLINE_LINUX_DEFAULT parameter (now it is: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.new_pll=0").

Laptop: ASUS Z53J series, MODEL=Z53J, MB ver.=F3JP, embedded VGA card=Radeon Mobility X1700.
Ubuntu flavour: KUbuntu.
No problem with Karmic Koala, the problem appeared after an upgrade to Lucid Lynx. Moreover, it appears after a fresh install of Lucid Lynx or while usind the Live-CD.
Problem: the screen flickers after the boot splash screen or just after login in and moving the mouse (apparently). The screen is unreadable.

Result of lspci -v (for the VGA part) :
01:00.0 VGA compatible controller: ATI Technologies Inc M66-P [Mobility Radeon X1700]
        Subsystem: ASUSTeK Computer Inc. Device 1242
        Flags: bus master, fast devsel, latency 0, IRQ 29
        Memory at c0000000 (32-bit, prefetchable) [size=256M]
        I/O ports at b000 [size=256]
        Memory at fdff0000 (32-bit, non-prefetchable) [size=64K]
        Expansion ROM at fdfc0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: radeon
        Kernel modules: radeon

Should I file a new bug report for more details ?