Comment 208 for bug 108527

Description of problem:
After enabling "desktop effects", display experiences random lockups during
display of said effects, and occasionally compiz will fail to start upon login.

Version-Release number of selected component (if applicable):
xorg-x11-drv-ati-6.6.3-1.fc6

How reproducible:
Just about every time.

Steps to Reproduce:
1. Buy a Lenovo ThinkPad T43p (http://www.thinkwiki.org/wiki/Category:T43p for
hardware specifications, I have the 15" 1600x1200 TFT).
2. Enable desktop effects using the xorg radeon driver.
3. Use desktop for a while, possibly log out and back in again.

Actual results:
On login, compiz will *sometimes* fail to start; disabling and then re-enabling
desktop effects fixes this. However, after several minutes to several hours of
use, the desktop will eventually hang (always in the middle of displaying a
fade, wobble, or other effect).

Expected results:
The same stability I got out of the non-AIGLX desktop. ;-) This was actually a
very stable setup prior to trying out AIGLX, with both the radeon driver and
with fglrx.

Additional info:
Here's the lspci info for my video card (I'll attach the full lspci output in a
moment, along with the xorg.conf I'm using and a relevant Xorg.0.log):

01:00.0 VGA compatible controller: ATI Technologies Inc M24 1T [FireGL M24 GL]
(rev 80) (prog-if 00 [VGA])
        Subsystem: IBM Unknown device 0570
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR+ FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort+ >SERR- <PERR-
        Latency: 0, Cache Line Size: 32 bytes
        Interrupt: pin A routed to IRQ 169
        Region 0: Memory at c0000000 (32-bit, prefetchable) [size=128M]
        Region 1: I/O ports at 3000 [size=256]
        Region 2: Memory at b0100000 (32-bit, non-prefetchable) [size=64K]
        [virtual] Expansion ROM at b0120000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 2
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [58] Express Endpoint IRQ 0
                Device: Supported: MaxPayload 128 bytes, PhantFunc 0, ExtTag+
                Device: Latency L0s <256ns, L1 <4us
                Device: AtnBtn- AtnInd- PwrInd-
                Device: Errors: Correctable- Non-Fatal- Fatal- Unsupported-
                Device: RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
                Device: MaxPayload 128 bytes, MaxReadReq 128 bytes
                Link: Supported Speed 2.5Gb/s, Width x16, ASPM L0s L1, Port 0
                Link: Latency L0s <256ns, L1 <2us
                Link: ASPM L1 Enabled RCB 64 bytes CommClk+ ExtSynch-
                Link: Speed 2.5Gb/s, Width x16
        Capabilities: [80] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-
                Address: 0000000000000000 Data: 0000
        Capabilities: [100] Advanced Error Reporting