[Bug 23421] dualhead - 2. monitor off (not just blank / black) on radeon; xrandr

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=23421





--- Comment #17 from kapetr <kapetr at mizera.cz>  2009-09-04 03:52:02 PST ---
(In reply to comment #16)

Hello 

> 
> disconnected just means the driver wasn't able to detect a monitor on that
> port.  you might try swapping the cables.  Also, if the problematic monitor
> uses the secondary dac, you can try:
> Option "TVDACLoadDetect" "TRUE"
> for the nomodeset case.
> Another option is force the output on in your xorg.conf.  See the page I posted
> in comment 4.  You'll basically want to add a monitor section with the same
> identifier as the output name and with the sync ranges for your monitor and:
> Option "Enable" "TRUE"
> 

Thank You - I will try it. 
But why Xorg in Ubuntu can detect the connected monitors and the (newer) in
Fedora don't ? 

> 
> Are you saying VGA-0 and VGA-1 switch after a VT switch?  That shouldn't
> happen.  Is this with nomodeset or modeset?
> 

No, the output names VGA-0 VGA-1 are contrariwise in Ubuntu X Fedora.
I had take note of this in F11 without nomodeset, when the (only) 1 monitor
(which is known as VGA-1 in Ubuntu) was reported in Fedora like VGA-0


> > P.S. 
> > - How to set mode (resolution, ...) 
> > - and dualhead on startup ? 
> > - With kernel mode setting ?
> 
> using xrandr.  read the guide I posted in comment 4. once you have both outputs
> on:
> xrandr --output VGA-0 --right-of VGA-1
> for example.  If you are using nomodeset, you'll have to specify a virtual
> screen large enough for both heads.  in the kms case, the driver will take care
> of it automatically.
> 

Of course - I use xrandr.
I did mean something else with "startup" - when kernel boots. I have thing,
that in future xrandr will be obsolete and kernel takes the mode/dualhed
setting job.

Also e.g. how to set the graph. mode (like with vga=791 in past) with KMS ?
BTW - I have try set mode on "text" console with fbset -v 640x480-60, but the
screen was damaged and after try to switch to X console, the system (or maybe
just keyboard/screen) hang.

Is there some another tool to ask kernel to change video mode ?
Or old procedures (like vga=..., fbset, xrandr, ...) have just new "internals"
- calling kernel KMS routines ?


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