Red Hat Bugzilla – Bug 218416
Installation on dual-monitor system fails
Last modified: 2007-11-30 17:11:50 EST
Description of problem: Installing from DVD, graphical interface, nVidia NV44
(GeForce 6200) detected. Video card has both VGI and digital monitors plugged
in. Under Windows XP, digital is primary. When Fedora installation DVD boots,
info appears on digital screen. After "Probing for video card" and successfully
detecting it, both screens go almost blank-dark blue with some white dots-and
nothing further happens.
Rebooting, now info comes up on VGA screen, and installation proceeds normally.
Version-Release number of selected component (if applicable):
How reproducible: Follow steps above
Steps to Reproduce:
1. see description
Actual results: see description
Expected results: see description
Also permanently disabled the DVI input of the monitor in question.
Created attachment 143468 [details]
dmesg output after boot
Created attachment 143469 [details]
Prove we're not running nvidia
Created attachment 143471 [details]
(Sorry about the order, forgot attachments submit separately)
Probably related, description:
Nvida N430 chipset (GeForce6150), screen corruption during RHGB and login when
using the nv driver with a monitor plugged into both Digital DVI and VGA outputs.
(Green vertical bars on gray-greenish background during RHGB, corrupted version
of the same on login).
If RHGB is diabled text boot proceeds normally, corruption still occurs on
reaching login screen.
In either case the virtual consoles Ctl-Atl-Fx can still be reached. They are
initally corrupted (scrambled white on black), but logging in at one will clear
them (typing when logging in has visible effect on scrambling). However they
will not scroll to follow the prompt. This can be worked around by switching
backwards and forwards between them, which will update them.
If the nvidia driver is used:
Without RHGB, the system behaves normally.
With RHGB, the same corruption is observed during RHGB, but the display is
normal after the nvidia logo appears. However the virtual consoles are affected
as described above.
On removing the DVI connection everything is normal as far as the login screen
(the nv driver has a dissapearing pointer to be filed separately).
Attachments above taken after booting with nv (unfortunately can't remember RHGB
*** Bug 219416 has been marked as a duplicate of this bug. ***
Have now tried with DVI only, the nv driver and rhgb work. Problem related to
the lack of dual head support in nv driver? Is this true for the original submitter?
Sorry, but you are correct. nv driver just doesn't support multihead. Period.
Even so, would it be possible to have one display working and one display blank
rather than two corrupt displays? It would certainly be preferable, the
fundamental problem is not the lack of display one both monitors, it's that
there is no usable display.
Good idea, but I am afraid definitevely this is for upstream development. Try to
file a bug there.
Regardless of driver support, FC6 installation on computer A, video card A, DVI
cable A, did permanent, hardware damage to monitor A.
Monitor A fails on another computer B + video card B, using WinXP.
Different monitor B works on computer A + video card A, using WinXP.
Therefore, there is something wrong with the FC6 installation. At the start of
the install, monitor A + video card A + cable A displayed the Fedora logo, etc.
Then the screen went blank and monitor A DVI no longer worked.
Video card A is GeForce 6200; monitor A is Viewsonic VA2012wb. FC6 install probe
detected video card as nVidia NV44 GeForce 6200. Shortly thereafter, screen went
Hi, just to give yuo head up and that we will try to investigate this further ASAP.
Hi, ols6000, we have contacted people from NVidia and even they never met their
card damaging hardware. The current prevailing suspicion is that your monitor
was already on the edge of falling apart and installation of Fedora (by having
different demands then Windows) just pushed him over.
We will continue to follow this bug, but if you have any additional information,
please, feel free to comment here.
The monitor has behaved perfectly for a year, using its digital input. I don't
believe it was "on the edge of falling apart", whatever that means. I also note
that the Windows drivers had no trouble operating the monitor.
There has been a related bug posted that Fedora doesn't support dual-head video
If you are serious about investigating this bug, you will first find out what
the situation is with DVI+VGA video nVidia cards, then talk to Viewsonic about
what could make their monitor not identify itself as digital. The digital signal
paths are intact, and the monitor will display from the digital input, but only
if the computer is fooled into thinking an operating monitor is present.
If you believe that the problem is my monitor, take a monitor of your own, hook
it up to a DVI+VGA video nVidia card, and let 'er rip. It's not an experiment
I'm willing to try.
> If you believe that the problem is my monitor, take a monitor of
> your own, hook it up to a DVI+VGA video nVidia card, and let 'er
> rip. It's not an experiment I'm willing to try.
This is exactly what I did, even to the point of manually attempting to switch
to DVI input (it didn't want to and switched back to VGA). Monitor is AG Neovo M19.
Feedback from your manufacturer on the fault in your monitor would be useful if
it's still under warrranty.
I agree that feedback would be useful, and monitor is under warranty, but would
take 1 mo to repair. Also, it's not likely Viewsonic would tell me what they
found, or that they repair at the component level. They probably just swap the
Since VGA input still works, I am just using it w/o DVI. Viewsonic doesn't make
service manual available, so I can't dx problem myself. I suspect there is an
output on DVI connector that signals "DVI here", and that transistor is blown.
If I had more time, I could check DVI specs and verify this hypothesis.
*** This bug has been marked as a duplicate of 153718 ***