[Bug 2556] New: Changing to terminal, then back causes lockup mobility U1

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https://bugs.freedesktop.org/show_bug.cgi?id=2556          
     
           Summary: Changing to terminal, then back causes lockup mobility
                    U1
           Product: xorg
           Version: 6.8.2
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Keywords: regression
          Severity: major
          Priority: P2
         Component: Driver/Radeon
        AssignedTo: xorg-bugzilla-noise at freedesktop.org
        ReportedBy: jim-cornette at insight.rr.com


Since FC3 was installed, I get a lockup of the server when changing from X that
was started in runlevel 3 via startx.
To get the problem, you would ctl-alt-Fn to a terminal, then change back to the
loaded X. (alt-F7).
What happens is there is striped paterns on the top of the display, my computer
fan starts to race and there is no way to shut down or halt X.
I also noticed that this problem is effected when I would change my screen
resolution or try to start the game tuxracer. 

Below is lspci -vvv information.

01:05.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility U1
(prog-if 00 [VGA])
        Subsystem: Hewlett-Packard Company Pavilion ze4400 builtin Video
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping+ SERR- FastB2B+
        Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
        Latency: 66 (2000ns min), Cache Line Size 10
        Interrupt: pin A routed to IRQ 10
        Region 0: Memory at e0000000 (32-bit, prefetchable) [size=256M]
        Region 1: I/O ports at 9000 [size=256]
        Region 2: Memory at d0100000 (32-bit, non-prefetchable) [size=64K]
        Capabilities: [58] AGP version 2.0
                Status: RQ=48 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans-
64bit- FW- AGP3- Rate=x1,x2,x4
                Command: RQ=16 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 PME-Enable- DSel=0 DScale=0 PME-          
     
     
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