[NBLUG/talk] Display Resolution in Ubuntu Desktop
eric at nblug.org
Tue Apr 3 09:31:54 PDT 2007
Inline was fine.
So, when I compare the "yes" and the "no" logs I can definitely see what the
(II) ATI(0): VESA VBE DDC read failed
followed by nothing about the monitor, then eventually:
(II) ATI(0): DELL 1800FP: Using default hsync range of 31.50-37.90 kHz
(II) ATI(0): DELL 1800FP: Using default vrefresh range of 50.00-70.00 Hz
(then there's a bunch of errors about graphics modes that won't work due to
requiring higher hsync and/or vrefresh rates than it thinks the monitor can
(II) ATI(0): VESA VBE DDC read successfully
Then followed by actual probed data ("plug and play") from the monitor:
(II) ATI(0): Manufacturer: DEL Model: e000 Serial#: 809644887
(II) ATI(0): clock: 108.0 MHz Image Size: 359 x 287 mm
(II) ATI(0): h_active: 1280 h_sync: 1328 h_sync_end 1440 h_blank_end 1688 h_border: 0
(II) ATI(0): v_active: 1024 v_sync: 1025 v_sync_end 1028 v_blanking: 1066 v_border: 0
(II) ATI(0): Serial No: 7R47734G0B3W
(II) ATI(0): Monitor name: DELL 1800FP
(II) ATI(0): Ranges: V min: 56 V max: 85 Hz, H min: 30 H max: 80 kHz, PixClock max 140 MHz
(II) ATI(0): DELL 1800FP: Using default hsync range of 30.00-80.00 kHz
(II) ATI(0): DELL 1800FP: Using default vrefresh range of 56.00-85.00 Hz
(II) ATI(0): Maximum clock: 199.00 MHz
Note that the really big difference is that the hsync and vrefresh ranges
Then in your xorg.conf, you've got:
Identifier "DELL 1800FP"
Which works great when the monitor can be probed but doesn't work when the
monitor isn't available.
I suggest trying out editing xorg.conf and changing that monitor section to
look more like:
Identifier "DELL 1800FP"
HorizSync 30.0 - 80.0
VertRefresh 56.0 - 85.0
Then let us know if that works...
On Mon, Apr 02, 2007 at 07:24:43PM -0700, Steve Bursch wrote:
> Thanks for your quick response. I appreciate it.
> Attached are 3 text files which were created on the Ubuntu machine. These
> files were requested in the 2 previous responses I received to my query
> about Ubuntu display resolutions being different depending on the setting
> of my KVM switch.
> 1. xorg.conf
> 2. Xorg.0.log.KVM.no
> 3. Xorg.0.log.KVM.yes
> The file with the "no" extension is the log file created at boot time with
> the KVM switch set such that it is NOT servicing the Ubuntu machine during
> The file with the "yes" extension is the log file created at boot time
> with the KVM switch set such that it IS servicing the Ubuntu machine
> during bootup.
> It's not clear if I should have included these files "in line" rather than
> as attachments. Please let me if I should xmit the data differently, and
> I will accommodate.
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