Re: SOLVED Re: 2560x1600 display issue. (x11?, nvidia 8800 GTS, hdmi, dvi-d, Dell U3011)

On 04/08/2011 11:40 PM, Linuxguy123 wrote:
On Fri, 2011-04-08 at 23:09 -0600, Linuxguy123 wrote:
On Fri, 2011-04-08 at 22:17 -0600, Linuxguy123 wrote:
Any and all advice on how to proceed from here, ie exactly what to put
in the xorg.conf file to tell the driver to ignore EDID and probings
use a modeline directly, will be appreciated.
I just found this in the log file.

26.275] (WW) NOUVEAU(0): Option "UseEDID" is not used
I switched back to the nvidia driver and got this.

24.634] (**) NVIDIA(0): Option "UseEDID" "False"
[ 24.635] (**) NVIDIA(0): Enabling RENDER acceleration
[ 24.635] (**) NVIDIA(0): Ignoring EDIDs
[ 24.635] (II) NVIDIA(0): Support for GLX with the Damage and
Composite X extensions is
[ 24.635] (II) NVIDIA(0): enabled.
[ 26.072] (II) NVIDIA(GPU-0): Not probing EDID on DFP-0.
[ 26.073] (II) NVIDIA(GPU-0): Not probing EDID on DFP-1.
[ 26.080] (II) NVIDIA(0): NVIDIA GPU GeForce 8800M GTS (G92) at
PCI:1:0:0 (GPU-0)
[ 26.080] (--) NVIDIA(0): Memory: 524288 kBytes
[ 26.080] (--) NVIDIA(0): VideoBIOS:
[ 26.080] (II) NVIDIA(0): Detected PCI Express Link width: 16X
[ 26.080] (--) NVIDIA(0): Interlaced video modes are supported on
this GPU
[ 26.080] (--) NVIDIA(0): Connected display device(s) on GeForce
8800M GTS at PCI:1:0:0
[ 26.080] (--) NVIDIA(0): DFP-0
[ 26.080] (--) NVIDIA(0): DFP-1
[ 26.080] (--) NVIDIA(0): DFP-0: 330.0 MHz maximum pixel clock
[ 26.080] (--) NVIDIA(0): DFP-0: Internal Dual Link LVDS
[ 26.080] (--) NVIDIA(0): DFP-1: 165.0 MHz maximum pixel clock
[ 26.080] (--) NVIDIA(0): DFP-1: Internal Single Link TMDS

The good news is that UseEDID "False" is working.

The bad news is that DFP-1 is the HDMI port. So the video card channel
that feeds it is only rated for 165MHz output, which isn't enough to
drive the U3011 at 2560x1600. Ironically, HP uses 330 MHz of bandwidth
to drive the internal display, which is only 1680x1050.

BUT WAIT. This laptop will drive 2 displays if I turn off the internal
display. Surely the HDMI port would get the 330 MHz dlock then ? Long
story short, it doesn't. The dual link port stays assigned to the
internal display panel and the HDMI port gets the single link port.

Even though Nvidia advertises some G8800s to have dual dual link

"Two dual-link DVI outputs for digital flat panel display resolutions up
to 2560x1600"

"Dual Dual-link DVI Support:
Able to drive the industry's largest and highest resolution flat-panel
displays up to 2560x1600. Available on select GeForce 8800 and 8600

In summary, there is no external port on the HDX9494 with a pixel rate
high enough to properly drive the U3011. Unless one can redirect DFP-0
to the HDMI port, there is no way to fix this problem.

Is there a way to reassign the internal video card port to the HDMI
port ?

The other interesting thing is that HP lists the pixel rate for
1920x1200 as 193.5 MHz in the U3011 manual, which is greater than the
supposed 165 MHz clock limit on DFP-1 and it appears to drive it just

From the U3011 manual:
VESA, 1920 x 1200 74.6 60.0 193.5 -/+

You can't do 2560x1600 using the HDMI interface on the U3011. Only the
DVI (using dual DVI cable) and displayport interface will go up to that
resolution. The HDMI interface only goes up to 1920x1200. You could try
adapters, but only a small number of them actually work. The following
is from the U3011 users Manual:

Setting the display resolution to 2048 x 1280 (VGA input source) /
2560 x 1600 (DVI/DisplayPort^(TM) input sources) / 1920 x 1200 (HDMI
input source)(Optimal)

For maximum display performance with Microsoft^® Windows^® operating
systems, set the display resolution to 2048 x 1280 (VGA input source) /
2560 x 1600 (DVI/Display

Port input sources) / 1920 x 1200 (HDMI input source) pixels by
performing the following steps:


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