[Nouveau] NV43: Native resolution not available on Dell 2007FP

Fri May 4 17:08:50 PDT 2012

On Saturday, 5 May 2012, Mark Hills wrote:

> On Sat, 5 May 2012, Maarten Maathuis wrote:
>
> > On Fri, May 4, 2012 at 5:55 PM, Mark Hills <mark at pogo.org.uk> wrote:
> > > I have a Dell 2007FP monitor. NV43 (GeForce 6600) can not use the
> native
> > > resolution.
> > >
> > > 1600x1200 is listed under "DDC gathered Modelines" with the rest of the
> > > info, but then is missing from "probed modes".
> > >
> > > I have a secondary card, NV4a (GeForce 6200, PCI). It works with this
> > > card. This card does not show "DDC gathered modelines" at all, and
> > > 1600x1200 is listed under "probed modes".
> > >
> > > Does this mean the NV4a card is not using the DDC info? Is it a bug
> > > preventing 1600x1200 being used with the NV43, or some consequence of
> DDC
> > > info?
> > >
> > > I am using Nouveau from Git, and kernel 3.4.0-rc4. The proprietary
> NVidia
> > > driver fully works, as does another 1600x1200 monitor (Lacie).
> > >
> > > Thanks
> > >
> > > --
> > > Mark
> > >
> > >
> > >
> > > [  4676.920] (--) NOUVEAU(0): Chipset: "NVIDIA NV43"
> > > [  4676.920] (II) NOUVEAU(0): Creating default Display subsection in
> Screen section
> > >        "Default Screen Section" for depth/fbbpp 24/32
> > > [  4676.920] (==) NOUVEAU(0): Depth 24, (--) framebuffer bpp 32
> > > [  4676.920] (==) NOUVEAU(0): RGB weight 888
> > > [  4676.920] (==) NOUVEAU(0): Default visual is TrueColor
> > > [  4676.920] (==) NOUVEAU(0): Using HW cursor
> > > [  4676.920] (==) NOUVEAU(0): GLX sync to VBlank disabled.
> > > [  4676.920] (==) NOUVEAU(0): Page flipping enabled
> > > [  4676.920] (==) NOUVEAU(0): Swap limit set to 1 [Max allowed 2]
> > > [  4676.940] (II) NOUVEAU(0): Output DVI-I-1 has no monitor section
> > > [  4676.966] (II) NOUVEAU(0): Output DVI-I-2 has no monitor section
> > > [  4677.054] (II) NOUVEAU(0): Output TV-1 has no monitor section
> > > [  4677.073] (II) NOUVEAU(0): EDID for output DVI-I-1
> > > [  4677.073] (II) NOUVEAU(0): Manufacturer: DEL  Model: a021  Serial#:
> 809779539
> > > [  4677.073] (II) NOUVEAU(0): Year: 2006  Week: 21
> > > [  4677.073] (II) NOUVEAU(0): EDID Version: 1.3
> > > [  4677.074] (II) NOUVEAU(0): Digital Display Input
> > > [  4677.074] (II) NOUVEAU(0): Max Image Size [cm]: horiz.: 41  vert.:
> 31
> > > [  4677.074] (II) NOUVEAU(0): Gamma: 2.20
> > > [  4677.074] (II) NOUVEAU(0): DPMS capabilities: StandBy Suspend Off
> > > [  4677.074] (II) NOUVEAU(0): Supported color encodings: RGB 4:4:4
> YCrCb 4:4:4
> > > [  4677.074] (II) NOUVEAU(0): Default color space is primary color
> space
> > > [  4677.074] (II) NOUVEAU(0): First detailed timing is preferred mode
> > > [  4677.074] (II) NOUVEAU(0): redX: 0.640 redY: 0.330   greenX: 0.300
> greenY: 0.600
> > > [  4677.074] (II) NOUVEAU(0): blueX: 0.150 blueY: 0.060   whiteX:
> 0.312 whiteY: 0.329
> > > [  4677.074] (II) NOUVEAU(0): Supported established timings:
> > > [  4677.074] (II) NOUVEAU(0): 720x400 at 70Hz
> > > [  4677.074] (II) NOUVEAU(0): 640x480 at 60Hz
> > > [  4677.074] (II) NOUVEAU(0): 640x480 at 75Hz
> > > [  4677.074] (II) NOUVEAU(0): 800x600 at 60Hz
> > > [  4677.074] (II) NOUVEAU(0): 800x600 at 75Hz
> > > [  4677.074] (II) NOUVEAU(0): 1024x768 at 60Hz
> > > [  4677.074] (II) NOUVEAU(0): 1024x768 at 75Hz
> > > [  4677.074] (II) NOUVEAU(0): 1280x1024 at 75Hz
> > > [  4677.074] (II) NOUVEAU(0): Manufacturer's mask: 0
> > > [  4677.074] (II) NOUVEAU(0): Supported standard timings:
> > > [  4677.074] (II) NOUVEAU(0): #0: hsize: 1280  vsize 1024  refresh: 60
>  vid: 32897
> > > [  4677.074] (II) NOUVEAU(0): #1: hsize: 1600  vsize 1200  refresh: 60
>  vid: 16553
> > > [  4677.074] (II) NOUVEAU(0): #2: hsize: 1152  vsize 864  refresh: 75
>  vid: 20337
> > > [  4677.074] (II) NOUVEAU(0): Supported detailed timing:
> > > [  4677.074] (II) NOUVEAU(0): clock: 162.0 MHz   Image Size:  367 x
> 275 mm
> > > [  4677.074] (II) NOUVEAU(0): h_active: 1600  h_sync: 1664  h_sync_end
> 1856 h_blank_end 2160 h_border: 0
> > > [  4677.074] (II) NOUVEAU(0): v_active: 1200  v_sync: 1201  v_sync_end
> 1204 v_blanking: [...]
> >
> > Hi, the nouveau driver contains a table that list per gpu generation
> > the maximum bandwidth a single tmds link can sustain.
> >
> > Your NV4A is newer than your NV43, it can do the full 165 MHz, instead
> > of the 155 MHz that the NV43 gets. Your 1600x1200 mode requires 162
> > MHz.
> >
> > I do not know if the limits are accurate, but a reduced blanking
> > 1600x1200 should use less bandwith, so if you somehow can get such a
> > mode into the system (maybe there is a kernel option to do this), but
> > this i do not know.
>
> Thanks, I see what you're saying. I think the relevant code looks to be
> get_tmds_link_bandwidth.
>
> But then if the mode given by the DDC is over this limit, I don't
> understand why the proprietary drivers do not have the same problem.
>
> Does it mean that the prietary driver is falling-back to one of its own
> built-in 1600x1200 modes?

I've looked at this issue previously, and IIRC the binary driver builds a
reduced blanking mode instead of what the monitor reports.

> The same NV43 with Nouveau is happy with the 1920x1200 of another Dell
> screen, and the 1600x1200 of the Lacie. These modes are:
>
> [ 13816.407] (II) NOUVEAU(0): Modeline "1920x1200"x0.0  154.00  1920 1968
> 2000 2080  1200 1203 1209 1235 +hsync -vsync (74.0 kHz)
> [ 13816.428] (II) NOUVEAU(1): Modeline "1600x1200"x0.0  130.89  1600 1620
> 1700 1780  1200 1201 1204 1225 +hsync +vsync (73.5 kHz)
>
> Maybe I can find time to revert the kernel and try and NVidia drivers, to
> check the Xorg.0.log file.
>
> Thanks for your help.
>
> --
> Mark
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