[Debian-eeepc-devel] Video out toggling
paulepanter at users.sourceforge.net
Wed Sep 10 06:57:22 UTC 2008
Am Dienstag, den 09.09.2008, 22:42 +0100 schrieb Phil Endecott:
> Hi Everyone,
> I have been playing with Fn+F5 video out toggling on my '901. I would
> guess that most of this applies equally to the smaller Eees. Assorted
> observations follow:
> 1. If the external monitor is attached when X starts, it chooses a size
> based on the DDC from the external monitor and the LCD just displays
> the top left corner (I don't think there's a way to pan this, is
> there?). This was surprising; I have no idea how to fix it.
> 2. Attempting to toggle when the XDM login screen is displayed doesn't
> work. My guess is that DISPLAY and/or XAUTHORITY is not being set
> correctly in this case. This could presumably be fixed in the
> scripts. (Where do errors from e.g. the xrandr command in the
> vga-toggle.sh script go to?)
> 3. The default script (well, the version that I have) sets the mode for
> the external monitor to 640x480, so only the top left portion of the
> screen is shown. Changing it to 1024x600 in
> /etc/default/eeepc-acpi-scripts fails because 1024x600 is not a mode
> that my external monitor advertises in its DDC. (In fact, I guess that
> very few if any monitors would advertise this mode; it's not one of the
> standard modes that needs only one bit of DDC data, and there's limited
> space in the DDC ROM for advertising non-standard modes.) However, I
> would be very surprised if there are any monitors made this millennium
> that would fail to display this mode if given it; at most you would
> need to press the "auto" button. And X already knows the timings for
> it because it's supplying it to the panel, so all that you need to do is
> xrandr --addmode VGA 1024x600
> before the existing "xrandr --output VGA --mode" and it will just
> work. A minor snag is that the current split between
> /etc/acpi/actions/vga-toggle.sh and /etc/default/eeepci-acpi-scripts
> doesn't suit this configuration.
> 4. 1024x600 renders no worse than 640x480 on my 1600x1200 external
> monitor; however, the scaling that the monitor does does not look
> great. 1024x768 looks much better after scaling because it's the same
> scale factor in X and Y. But 1024x768 is better than the LCD.
Could you elaborate on this last sentence please? I did not understand
it. Do you mean the internal monitor cannot handle 1024x768?
> solution is to use a 1024x600 "letter box" mode where there are 600
> active lines and 168 blank lines, so that the monitor thinks it's
> 1024x768. I got this to work with the following:
> xrandr --newmode 1024x600LB 78.8 1024 1040 1136 1312 600 601 604 800
> xrandr --addmode VGA 1024x600LB
> xrandr --output VGA --mode 1024x768LB
> That works, though it puts all the blank lines at the top of the
> image. For some reason my monitor didn't like it when I tried to put
> half the lines above and half below, but I may have mis-typed
> something. I'll have to get my scope out and try again.
> Presumably with some clever scripting you could cycle through all these
> various possibilities.
> Still to do:
> - I would be interested to hear from anyone with a widescreen monitor
> (e.g. 1440x900) who can try this.
> - Is there any way to use the native resolution of the external monitor
> and to show a scaled-down version on the Eee?
> - I am very keen to get external monitor switching working for the
> console. Also I'd like to get a 1024x600 console, which I think needs
> either a BIOS fix or some serious surgery in the intelfb driver. If
> anyone knows anything at all about this, _please_ get in touch!
Where did you find all this information. Manpages or can you share a
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