[Bug 34123] New: Radeon with KMS enabled causes X to start flickering ('GPU losing synchronisation')

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=34123

           Summary: Radeon with KMS enabled causes X to start flickering
                    ('GPU losing synchronisation')
           Product: xorg
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: gijs.hillenius at gmail.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=43190)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=43190)
Xorg log, 

A Thinkpad Z61m has a Radeon Mobility X1400 on board. Up until this weekend,
when Debian 6.0 was released, it was fine to use Debian 'testing & unstable' on
this laptop, as long as KMS was disabled, by adding "options radeon modeset=0"
to "/etc/modprobe.d/radeon-kms.conf".

Enabling KMS makes X not very useable, for after a while the screen will start
to flicker, sometimes very fast, making everything a blur, and sometimes
slower. In all cases, closing & opening the lid of the laptop helps restore X.

After Debian 6, newer Xorg related packages came into testing, and disabling
KMS was no longer an option, for in that case X simply would not start.

I don't know what the issue is, but on the linux-thinkpad mailing list it was
described this week as: "The GPU loses somehow its synchronization over time."

Attaching the X log

output from lspci -v 

01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility X1400
(prog-if 00 [VGA controller])
        Subsystem: Lenovo Device 202a
        Flags: bus master, fast devsel, latency 0, IRQ 30
        Memory at d8000000 (32-bit, prefetchable) [size=128M]
        I/O ports at 2000 [size=256]
        Memory at ee000000 (32-bit, non-prefetchable) [size=64K]
        [virtual] Expansion ROM at ee020000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: radeon

Debian Linux, linux-image 2.6.32-5-686

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