Dear Phil,
two questions. 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? > The > 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 great website? Thanks, Paul
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