HDMI out is limited to 640x480

what if you plug it in after boot, do you get the same behavior ?
might be that reading the EDID data does not work properly if you have connected HDMI on boot.

I checked that again. Unfortunately same behaviour.

First time I plugged HDMI I even had a picture in picture situation,
the external screen showing 640x480 pixel of the ac100 screen. But the
option 'same image in all monitors' of the Monitor preferences GUI was
greyed out.

I then managed to separate the screens, but still I have no
possibilities to modify the resolution of the external screen.

I ask myself if the 16:10 screen is the source of the problem...

2011/7/7 Oliver Grawert <email address hidden>:
> what if you plug it in after boot, do you get the same behavior ?
> might be that reading the EDID data does not work properly if you have connected HDMI on boot.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/806556
>
> Title:
>  HDMI out is limited to 640x480
>
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Additional Hardware information:

My Monitor: AOC zifas 2218ph

Plug & Play DDC2B Feature

This monitor is equipped with VESA DDC2B capabilities according to the VESA DDC STANDARD. It allows the monitor to inform the
host system of its identity and, depending on the level of DDC used, communicate additional information about its display capabilities.
The DDC2B is a bi-directional data channel based on the I2C protocol. The host can request EDID information over the DDC2B
channel.

Ppossible resolutions:

VGA 640x480 @60Hz
VGA 640x480 @72Hz
VGA 640x480 @75Hz
Dos-mode 720x400 @70Hz
Dos-mode 640x400 @71Hz
SVGA 800x600 @56Hz
SVGA 800x600 @60Hz
SVGA 848x480 @60Hz
SVGA 800x600 @72Hz
SVGA 800x600 @75Hz
XGA 1024x768 @60Hz
XGA 1024x768 @70Hz
XGA 1024x768 @75Hz
XGA 1024x768 @75Hz
XGA 1280x768 @60Hz
XGA 1280x768 @75Hz
SXGA 1280x1024 @60Hz
SXGA 1280x1024 @70Hz
SXGA 1360x768@60Hz
WSXGA 1680x1050 @60Hz
WSXGA+ 1680x1050@60Hz

Same problem here. Plugged in while Xorg was running. I was able to set a higher resolution through sysfs, but that corrupted the framebuffer. Monitor: Samsung SyncMaster 2443 B

kernel 2.6.38 has better support for EDID reading. It reads out EDID data correctly from my monitor (Lenovo 1920x1200), but also fails to set the correct resolution (only 1024x768). This may be a limitation of the (alpha status) tegra driver.

My test was partially sucessfull.
The setting was Ogra's 2.6.38 installation, Tegra 12 Alpha video driver, DVI-d to HDMI adaptor and a Dell P2311H monitor.
I've booted with the monitor pluged in, and it correctly displayed 1920x1200.
Although really slow I was surprised by the GPU of this machine.
The monitor showed all the screen while the display had an upper left clipping of it.

I also switched to the 2.6.38 kernel from the ac100 ppa. In my my
case, even though there is a slight improvement of image quality on
the ac100, the main issue remains unsolved.

My screen is not recognized correctly and would only display 640x480.
We will see if a newer nvidia-tegra driver will change that situation.

2011/8/15 Nicolás Wolovick <email address hidden>:
> My test was partially sucessfull.
> The setting was Ogra's 2.6.38 installation, Tegra 12 Alpha video driver, DVI-d to HDMI adaptor and a Dell P2311H monitor.
> I've booted with the monitor pluged in, and it correctly displayed 1920x1200.
> Although really slow I was surprised by the GPU of this machine.
> The monitor showed all the screen while the display had an upper left clipping of it.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/806556
>
> Title:
>  HDMI out is limited to 640x480
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ac100/+bug/806556/+subscriptions
>