ATI Proprietary Driver : Motherboard VGA black screen

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kanche
Posts: 2
Joined: 2015/01/30 13:27:08

ATI Proprietary Driver : Motherboard VGA black screen

Post by kanche » 2015/01/30 13:39:35

I have CentOS workstation in office. Today I tried to plug a second monitor in the motherboard VGA slot.The screen is not getting detected. Another workstation that does not have the proprietary fglrx driver installed can detect the intel vga out of the box. I want to get the motherboard display working with the fglrx driver because with open-source ati drivers, I get glitches like trailing cursors in the amd display.

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$ lspci | grep -E "VGA|3D" 
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos XT [Radeon HD 7470/8470 / R5 235 OEM]

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$ xrandr -q
Screen 0: minimum 320 x 200, current 1600 x 900, maximum 16384 x 16384
DFP1 disconnected (normal left inverted right x axis y axis)
DFP2 disconnected (normal left inverted right x axis y axis)
DFP3 disconnected (normal left inverted right x axis y axis)
DFP4 disconnected (normal left inverted right x axis y axis)
DFP5 disconnected (normal left inverted right x axis y axis)
CRT1 connected primary 1600x900+0+0 (normal left inverted right x axis y axis) 443mm x 249mm
   1600x900       60.0*+
   1280x1024      75.0     60.0  
   1440x900       60.0  
   1280x960       75.0     60.0  
   1152x864       75.0     60.0  
   1280x768       75.0     60.0  
   1280x720       75.0     60.0  
   1024x768       75.0     60.0  
   800x600        75.0     60.3  
   640x480        75.0     59.9  

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TrevorH
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Re: ATI Proprietary Driver : Motherboard VGA black screen

Post by TrevorH » 2015/01/30 14:25:40

Check your BIOS. Many will disable onboard graphics if an add-on card is present.
CentOS 6 will die in November 2020 - migrate sooner rather than later!
Info for USB installs on http://wiki.centos.org/HowTos/InstallFromUSBkey
CentOS 5 is dead, do not use it.
Full time Geek, part time moderator. Use the FAQ Luke

kanche
Posts: 2
Joined: 2015/01/30 13:27:08

Re: ATI Proprietary Driver : Motherboard VGA black screen

Post by kanche » 2015/02/02 11:47:57

Thank you @TrevorH for your reply. But dual display with the same config works in Windows. I feel it is not disabled in bios.

Sometimes, the second monitor mirrors a few lines while booting:

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[ Ok ] Started NFS file locking service
[ Ok ] Reached target Network File System Server
[ Ok ] Started Postfix Mail Transport Agent
[ Ok ] Started Crash recovery kernel arming
                                                                 -
but after that the centos splash screen shows up in the amd monitor and the other monitor remains stuck with those messages.

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