I'll add some info to this, since I experience the same behaviour. Might be related to bugs #98684, #98721 and/or #99003 and/or more.
I'm using kubuntu feisty beta ("release") with latest updates from today. Running with xorg driver "ati" is fine, using fglrx is not. xorg.conf (part): Section "Device" identifier "ATI Technologies Inc Radeon R300 NE [Radeon 9500 Pro]" boardname "ati" busid "PCI:2:0:0" driver "fglrx" screen 0 EndSection Hardware: 02:00.0 VGA compatible controller: ATI Technologies Inc Radeon R300 NE [Radeon 9500 Pro] (prog-if 00 [VGA]) Subsystem: ATI Technologies Inc Radeon R300 NE [Radeon 9500 Pro] 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: 255 (2000ns min), Cache Line Size: 32 bytes Interrupt: pin A routed to IRQ 19 Region 0: Memory at d0000000 (32-bit, prefetchable) [size=128M] Region 1: I/O ports at d000 [size=256] Region 2: Memory at e5000000 (32-bit, non-prefetchable) [size=64K] [virtual] Expansion ROM at e4000000 [disabled] [size=128K] Capabilities: [58] AGP version 3.0 Status: RQ=256 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW+ AGP3+ Rate=x4,x8 Command: RQ=1 ArqSz=0 Cal=0 SBA+ AGP- GART64- 64bit- FW- Rate=<none> 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- 02:00.1 Display controller: ATI Technologies Inc Radeon R300 [Radeon 9500 Pro] (Secondary) Subsystem: ATI Technologies Inc Radeon R300 NE [Radeon 9500 Pro] 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- Region 0: Memory at d8000000 (32-bit, prefetchable) [disabled] [size=128M] Region 1: Memory at e5010000 (32-bit, non-prefetchable) [disabled] [size=64K] 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- Error message from /var/log/Xorg.0.log: II) fglrx(0): Primary Controller - CRT on primary DAC (II) fglrx(0): Internal Desktop Setting: 0x00000008 (II) fglrx(0): POWERplay not supported on this hardware (EE) fglrx(0): === [swlDalHelperAddCustomizeMode] === CWDDEDI_DisplayGetSetModeTimingOverride failed: 7 (EE) fglrx(0): === [swlDalHelperAddCustomizeMode] === CWDDEDI_DisplayGetSetModeTimingOverride failed: 7 (EE) fglrx(0): === [swlDalHelperAddCustomizeMode] === CWDDEDI_DisplayGetSetModeTimingOverride failed: 7 Backtrace: 0: /usr/bin/X(xf86SigHandler+0x81) [0x80c5d91] 1: [0xffffe420] 2: /usr/lib/xorg/modules/drivers//fglrx_drv.so [0xb7567e5f] 3: /usr/lib/xorg/modules/drivers//fglrx_drv.so(DALCWDDE+0x1a2) [0xb75664a2] 4: /usr/lib/xorg/modules/drivers//fglrx_drv.so(swlDalHelperAddCustomizeMode+0x1a4) [0xb74fcd54] 5: /usr/lib/xorg/modules/drivers//fglrx_drv.so(atiddxPreInit+0xb7b) [0xb74d675b] 6: /usr/bin/X(InitOutput+0x9aa) [0x80a5b9a] 7: /usr/bin/X(main+0x27b) [0x807456b] 8: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xdc) [0xb7d8cebc] 9: /usr/bin/X(FontFileCompleteXLFD+0x1e1) [0x8073ab1] Fatal server error: Caught signal 11. Server aborting That's all, I can tell yo uright now, please tell me if you need more info! Thanks for any help Carsten -- Feisty crashes at login screen after enabling the proprietay driver https://launchpad.net/bugs/96652 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs