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[Ali Asad <aliasad20@xxxxxxxxx>]

Hi Ubuntu Folks, 
Tested on Lucid Lynx 10.04. I think this problem is worse on laptop for processors that has built-in Intel HD graphics (i3 and newer i5 and i7). For example, mine is an Intel core i5 cpu (i5 520M 2.40GHz) and BIOS is defaulted to the HD graphics and there are no BIOS options to change the default. Now, my 512 MB ATI Mobility Radeon HD 4550 Graphics card could not be used at all. After the installation of proprietary as well as open source driver for ATI - ended up getting a blank screen if explicitly xorg.conf is used for loading driver radeon or fglrx. Following are the details with regards to the attached /var/log/Xorg.0.log file. 

PC Model: DV4 HP-Pavilion 2112Tx
CPU: Intel Core i5 520M, 2.40GHz
OS: Ubuntu Lucid Lynx - 10.04
Graphics Card: ATI Mobility Radeon HD 4550


Output of lspci | grep VGA:
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02)
01:00.0 VGA compatible controller: ATI Technologies Inc M93 [Mobility Radeon HD 4500 Series]


In the /var/log/Xorg.0.log file please observe the following:

(II) RADEON(0): initializing int10
(EE) RADEON(0): Cannot read V_BIOS (3) Input/output error
(WW) RADEON(0): Failed to read PCI ROM!
(II) RADEON(0): Attempting to read un-POSTed bios
(WW) RADEON(0): Failed to read PCI ROM!
(WW) RADEON(0): Unrecognized BIOS signature, BIOS data will not be used
(II) UnloadModule: "radeon"
(II) UnloadModule: "int10"


** Attachment added: "/var/log/Xorg.0.log file"
   http://launchpadlibrarian.net/49729297/Xorg_error.log

-- 
xserver cannot read V_BIOS of second graphics card
https://bugs.launchpad.net/bugs/430919
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