Red Hat Bugzilla – Bug 214121
No video output from FC6 on nVidia NV6 [Vanta/Vanta LT]
Last modified: 2009-07-14 12:47:57 EDT
Description of problem:
While installation went OK in graphical mode, after the installation
completed X gave no graphical output (CRT led seems indicate no-signal or
power-saving mode) until I modified /etc/X11/xorg.conf using some lines from
Fedora Core 4 install
[note: I had the same problem with FC6test3]
Version-Release number of selected component (if applicable):
Do not know generally; on my setup it happenes with originial xorg.conf both
aftrer FC6test3 and FC6 installation
Steps to Reproduce:
No video output unless /etc/X11/xorg.conf modified
Should work out of the box, like in Fedora Core 4
I am including as attachements original and modified xorg.conf and xorg log files.
Created attachment 140416 [details]
original xorg.conf (not working for my setup)
Created attachment 140417 [details]
modified /etc/X11/xorg.conf which works for me
Created attachment 140418 [details]
/var/log/Xorg.0.log with original xorg.conf file (no video visible)
Created attachment 140419 [details]
/var/log/Xorg.0.log with modified xorg.conf file (video visible OK)
Sorry about possible mis-information: I do not know whether it would work with
Fedora Core 4 out of the box.
I have checked that I had Matrox G200 originally when I was installing FC4, and
than changed to Nvidia; The xorg.conf file was most probably vim-ed by me.
Tough to fix this one. We're inferring the supported sync ranges from the
monitor's advertised timings, but it's advertising that it supports
1600x1200@75, so that's what we pick, and then it doesn't work.
So just for interest's sake, does the card work if you use the non-working
xorg.conf in attachment #140416 [details], but with DefaultDepth 16? I wonder if we're
not hitting memory bandwidth instead of monitor limit.
Setting DefaultDepth to 16, or both DefaultDepth and Depth (in Display
SubSection) did not help;
If I set screen resolution for a user in KDE or GNOME to some usefule value,
like 1024x786 at 85Hz, then after startx monitors goes off for a second or two
and then on with defined resolution.
If I start X with my modified xorg.conf as was included (and no setting in
GNOME), the monitor starts at 1600x1200, 65Hz.
It is interesting to note, that
1. While I selected 85Hz in KDE, monitor OSD gives 84.9 Hz
2. X in Knoppix 5.1 seems to behave much better than FC6 on all machines I
tried: besides my home PC with Vanta, Compaq DeskPro with Intel 845,
CompaqProliant 3000 with some ATI: on all these machines FC6 required me to
tweak xorg.conf while Knoppix started out-of-the-box.
In the meantime I have upgraded monitor from CRT to
a DELL LCD, running at 1280x1024 resolution and 60Hz.
It is running perfectly well with standard xorg.conf.
On the other hand, when I run Knoppix it sets suboptiomal low resolution.
Changing version to '9' as part of upcoming Fedora 9 GA.
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