[Bug 76123] "System setting -> Monitor&Diplay -> Power saving" ruins xorg.conf

[Booty]

Public bug reported:

Hello, im using Kubuntu Edgy with kde 3.5.5
Also i have propertiary fglrx driver installed for my ATI videocard
When trying to set "Turn off monitor" option from default 5 hours to
my own value, xorg.xonf gets overwritten and X doesn't start next boot,
with following error:

(==) fglrx(0): TMDS coherent mode is enabled
Cannot find any valid mode
(EE) fglrx(0): PreInitModes failed
(EE) fglrx(0): PreInit failed
(II) fglrx(0): === [atiddxPreInit] === end

Backtrace:
0: /usr/bin/X(xf86SigHandler+0x81) [0x80c3971]
1: [0xffffe420]
2: /usr/lib/xorg/modules/drivers/fglrx_drv.so(atiddxFreeScreen+0x33) [0xb7476f23
]
3: /usr/bin/X(xf86DeleteScreen+0x6e) [0x80d1dbe]
4: /usr/bin/X(InitOutput+0xa18) [0x809ff68]
5: /usr/bin/X(main+0x276) [0x806e506]
6: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xdc) [0xb7d298cc]
7: /usr/bin/X(FontFileCompleteXLFD+0xa1) [0x806da51]

Fatal server error:
Caught signal 11.  Server aborting

** Affects: kdebase (Ubuntu)
     Importance: Undecided
         Status: Confirmed

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"System setting -> Monitor&Diplay -> Power saving" ruins xorg.conf
https://launchpad.net/bugs/76123