[Bug 31859] New: graphics corruption on display :0 when using two sessions

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=31859

           Summary: graphics corruption on display :0 when using two
                    sessions
           Product: xorg
           Version: 7.5
          Platform: Other
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: Martin at Lichtvoll.de
         QAContact: xorg-team at lists.x.org


Created an attachment (id=40499)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=40499)
graphic corruptions after I switched back to :0 directly after starting :1

I am getting corrupted graphics on display :0 as soon as I start another
session. I am not getting corrupted graphics on the second display :1.

This is on a ThinkPad T42 with with Radeon KMS:

00:01.0 PCI bridge: Intel Corporation 82855PM Processor to AGP Controller (rev
03) (prog-if 00 [Normal decode])
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
        Latency: 96
        Bus: primary=00, secondary=01, subordinate=01, sec-latency=64
        I/O behind bridge: 00003000-00003fff
        Memory behind bridge: c0100000-c01fffff
        Prefetchable memory behind bridge: e0000000-e7ffffff
        Secondary status: 66MHz+ FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- <SERR- <PERR-
        BridgeCtl: Parity- SERR- NoISA+ VGA+ MAbort- >Reset- FastB2B-
                PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-

01:00.0 VGA compatible controller: ATI Technologies Inc RV350 [Mobility Radeon
9600 M10] (prog-if 00 [VGA controller])
        Subsystem: IBM Device 0550
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR+ FastB2B+ DisINTx-
        Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 66 (2000ns min), Cache Line Size: 32 bytes
        Interrupt: pin A routed to IRQ 11
        Region 0: Memory at e0000000 (32-bit, prefetchable) [size=128M]
        Region 1: I/O ports at 3000 [size=256]
        Region 2: Memory at c0100000 (32-bit, non-prefetchable) [size=64K]
        [virtual] Expansion ROM at c0120000 [disabled] [size=128K]
        Capabilities: [58] AGP version 2.0
                Status: RQ=80 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans-
64bit- FW+ AGP3- Rate=x1,x2,x4
                Command: RQ=32 ArqSz=0 Cal=0 SBA+ AGP+ GART64- 64bit- FW-
Rate=x4
        Capabilities: [50] Power Management version 2
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Kernel driver in use: radeon

And kernel:

martin at shambhala:~> cat /proc/version
Linux version 2.6.36-tp42-gtt-vram-apart-v2-dirty (martin at shambhala) (gcc
version 4.4.5 (Debian 4.4.5-4) ) #1 PREEMPT Thu Oct 21 12:10:49 CEST 2010

(which is a plain 2.6.36 with second last patch I think to fix bug #28402)

And the following userspace:

martin at shambhala:~> apt-show-versions | egrep
"(xserver-xorg/|xserver-xorg-core/|xserver-xorg-video-radeon/|libgl1-mesa-dri/|kdelibs5/|kde-window-manager/|libqt4-gui/)"
kde-window-manager/experimental-snapshots uptodate 4:4.5.1-0r2
kdelibs5/experimental-snapshots uptodate 4:4.5.3-0r1
libgl1-mesa-dri/experimental uptodate 7.9+repack-1
libqt4-gui/squeeze uptodate 4:4.6.3-4
xserver-xorg/squeeze uptodate 1:7.5+8
xserver-xorg-core/squeeze uptodate 2:1.7.7-9
xserver-xorg-video-radeon/squeeze uptodate 1:6.13.1-2+squeeze1

I am using KDE 4.5 with OpenGL compositing enabled on both sessions. But
graphics corruption on display :0 also happens, when I start GNOME without
compositing on the second display :1.

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