On Saturday, 5 May 2012, Mark Hills wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Sat, 5 May 2012, Maarten Maathuis wrote: > On Fri, May 4, 2012 at 5:55 PM, Mark Hills <<a>mark@pogo.org.uk</a>> 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@70Hz > > [ 4677.074] (II) NOUVEAU(0): 640x480@60Hz > > [ 4677.074] (II) NOUVEAU(0): 640x480@75Hz > > [ 4677.074] (II) NOUVEAU(0): 800x600@60Hz > > [ 4677.074] (II) NOUVEAU(0): 800x600@75Hz > > [ 4677.074] (II) NOUVEAU(0): 1024x768@60Hz > > [ 4677.074] (II) NOUVEAU(0): 1024x768@75Hz > > [ 4677.074] (II) NOUVEAU(0): 1280x1024@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?</blockquote> <div>I've looked at this issue previously, and IIRC the binary driver builds a reduced blanking mode instead of what the monitor reports.</div> <div> </div> <div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> 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</blockquote>