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Old 03-01-12, 09:03 AM   #1
andypurk
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Join Date: Oct 2005
Posts: 2
Default [BUG?] xorg.conf not working with dual Alienware2310/3D vision setup

I have a problem with the following setup:

Operating System:
RHELS 5.7 x86_64

Nvidia Driver:
295.20 (and earlier version tried over the last nine months) x86_64 version
Graphics Card:
Quadro 4000

Displays:
1) Alienware 2310 connected to DVI port with dual link cable
2) Alienware 2310 connected to DP port with adaptor cable and dual link DVI

3D Vision wireless setup.

The problem is that I can't get the xorg.conf file to allow twinview with one screen stereo (at 120Hz) and the second screen non-stereo (at 60Hz). We have a similar setup with one Alienware screen and one Samsung 60Hz screen where the twinview which 'half' stereo works fine.

If I start the system with the simple nvidia-xconfig generated xorg.conf file (with the Option "stereo" "10" line), then only one screen is enabled, but nvidia-settings can be used to enable second screen at 60Hz and with the desktop covering both screens. However, merging these settings with xorg.conf and rebooting leads to the second screen being disabled and it is only possible to run it at 640x480 using nvidia-settings.

The relevant part of the log file appears to be:
Quote:
(--) Feb 29 17:50:26 NVIDIA(0): Connected display device(s) on Quadro 4000 at PCI:3:0:0
(--) Feb 29 17:50:26 NVIDIA(0): Dell Alienware2310 (DFP-0)
(--) Feb 29 17:50:26 NVIDIA(0): Dell Alienware2310 (DFP-1)
(--) Feb 29 17:50:26 NVIDIA(0): Dell Alienware2310 (DFP-0): 330.0 MHz maximum pixel clock
(--) Feb 29 17:50:26 NVIDIA(0): Dell Alienware2310 (DFP-0): Internal Dual Link TMDS
(--) Feb 29 17:50:26 NVIDIA(0): Dell Alienware2310 (DFP-1): 165.0 MHz maximum pixel clock
(--) Feb 29 17:50:26 NVIDIA(0): Dell Alienware2310 (DFP-1): Internal Single Link TMDS
(**) Feb 29 17:50:26 NVIDIA(0): TwinView enabled
(II) Feb 29 17:50:26 NVIDIA(0): Display Devices found referenced in MetaMode: DFP-0, DFP-1
(**) Feb 29 17:50:26 NVIDIA(0): Using HorizSync/VertRefresh ranges from the EDID for display
(**) Feb 29 17:50:26 NVIDIA(0): device Dell Alienware2310 (DFP-0) (Using EDID frequencies
(**) Feb 29 17:50:26 NVIDIA(0): has been enabled on all display devices.)
(**) Feb 29 17:50:26 NVIDIA(0): Using HorizSync/VertRefresh ranges from the EDID for display
(**) Feb 29 17:50:26 NVIDIA(0): device Dell Alienware2310 (DFP-1) (Using EDID frequencies
(**) Feb 29 17:50:26 NVIDIA(0): has been enabled on all display devices.)
(WW) Feb 29 17:50:26 NVIDIA(0): Unable to find any NVIDIA 3D Vision Stereo mode timings for
(WW) Feb 29 17:50:26 NVIDIA(0): use with the EDID of Dell Alienware2310 (DFP-1); NVIDIA 3D
(WW) Feb 29 17:50:26 NVIDIA(0): Vision Stereo may not function properly. This might happen
(WW) Feb 29 17:50:26 NVIDIA(0): if no EDID is available for Dell Alienware2310 (DFP-1), or
(WW) Feb 29 17:50:26 NVIDIA(0): if the NVIDIA 3D Vision Stereo mode timings were
(WW) Feb 29 17:50:26 NVIDIA(0): invalidated, e.g., if a display port connection lacks
(WW) Feb 29 17:50:26 NVIDIA(0): adequate bandwidth.
(WW) Feb 29 17:50:26 NVIDIA(0): Native backend mode 640x480 is not compatible with NVIDIA 3D
(WW) Feb 29 17:50:26 NVIDIA(0): Vision; NVIDIA 3D Vision may not function properly on Dell
(WW) Feb 29 17:50:26 NVIDIA(0): Alienware2310 (DFP-1).
(II) Feb 29 17:50:26 NVIDIA(0): Assigned Display Devices: DFP-0, DFP-1
(II) Feb 29 17:50:26 NVIDIA(0): Validated modes:
(II) Feb 29 17:50:26 NVIDIA(0): "DFP-0:1920x1080_120+0+0,DFP-1:1920x1080_60+1920+0"
(II) Feb 29 17:50:26 NVIDIA(0): Virtual screen size determined to be 1920 x 1080
which shows the lack of bandwidth on the second connection meaning that stereo is not supported (as expected) but then running the screen at 60Hz seems to be skipped over as an option despite being a validated mode.

We can continue to use the nvidia-settings program (and load the settings at login), but I would prefer to set up machines using xorg.conf for portability. The same problem persists if I configure xorg.conf to use edid file generated by nvidia-settings.

Attached are the nvidia-bug-report output (with the second screen was plugged into the alternate DP port), the full Xorg.0.log file for which part is quoted above and a working xorg.conf file from the other machine mentioned.

An additional point:

The second machine (with different screens) also behaves differently under KDE, where it is possible to configure both the screens separately, whereas with the dual Alienware screens there is only ever the large virtual screen (3840 x 1080) which can be configured.
Attached Files
File Type: gz nvidia-bug-report.log_forforum.gz (84.6 KB, 36 views)
File Type: log Xorg.0_broken.log (27.5 KB, 28 views)
File Type: bz2 Working_xorg.conf.bz2 (929 Bytes, 33 views)
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Old 03-02-12, 12:59 AM   #2
sandipt
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Default Re: [BUG?] xorg.conf not working with dual Alienware2310/3D vision setup

Are you using DisplayPort to Dual Link DVI - 3D Vision Capable/supported dongle ?
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Old 03-02-12, 09:54 AM   #3
andypurk
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Default Re: [BUG?] xorg.conf not working with dual Alienware2310/3D vision setup

Quote:
Originally Posted by sandipt View Post
Are you using DisplayPort to Dual Link DVI - 3D Vision Capable/supported dongle ?
It is only a single link DisplayPort to DVI adaptor cable (connecting to a dual-link DVI cable), but surely that shouldn't matter as I am only requesting 60Hz refresh rate for the 2nd screen. We don't need both screens to display stereo.
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Old 03-15-12, 02:19 AM   #4
sandipt
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Default Re: [BUG?] xorg.conf not working with dual Alienware2310/3D vision setup

Internal Bug ID 951184 to track this issue. Don't need both screens to display stereo.
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