Same problem here, I use a ATI Radeon HD4870 (RV770 chip).
Since I upgraded to Kubuntu 9.10, every about 2-3 startups KDE is not starting,
but instead I get this GTK-like message "Ubuntu is running in low-graphics
mode".
I found out that if I click on console login, and then do a Ctrl+F2 and
Ctrl+F7 again, suddenly KDE starts up magically, running perfectly
normal, even with 3D desktop effects.
lspci -vvv
01:00.0 VGA compatible controller: ATI Technologies Inc RV770 [Radeon HD 4870]
Subsystem: ATI Technologies Inc Device 0502
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: 0, Cache Line Size: 32 bytes
Interrupt: pin A routed to IRQ 29
Region 0: Memory at d0000000 (64-bit, prefetchable) [size=256M]
Region 2: Memory at f7ee0000 (64-bit, non-prefetchable) [size=64K]
Region 4: I/O ports at c000 [size=256]
Expansion ROM at f7ec0000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: fglrx_pci
Kernel modules: fglrx, radeon
** Attachment added: "kdm.log"
http://launchpadlibrarian.net/35014238/kdm.log
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KDE doesn't start after 9.10 update. Radeon? KDM?
https://bugs.launchpad.net/bugs/465470
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