Re: Blanky rivafb vs snowy nvidiafb with 2.6.12

[Giuseppe Bilotta <bilotta78@hotpop.com>]

On Thu, 29 Sep 2005 05:01:15 +0800, Antonino A. Daplas wrote:

> Giuseppe Bilotta wrote:
>> Hello all,
>> 
> 
>> * I have thus tried the new nvidiafb driver, which seems to work ok,
>> except for the minor detail that the display is extremely snowy.
>> Attempts to change the timing options with fbset fail: fbset seems to
>> accept the settings, no error message is given, but nothing is
>> changed. The X nv driver select the correct timings, so I tried
>> modeline2fb to make fbset use those, but still nothing changes.
>> 
> 
> What's the dmesg output?

"""
nvidiafb: nVidia device/chipset 10DE0112
nvidiafb: nVidia Corporation NV11 [GeForce2 Go]
nvidiafb: EDID found from BUS2
nvidiafb: CRTC 1 is currently programmed for DFP
nvidiafb: Using DFP on CRTC 1
Panel size is 1600 x 1200
nvidiafb: MTRR set to ON
Console: switching to colour frame buffer device 200x75
nvidiafb: PCI nVidia NV11 framebuffer (32MB @ 0xE0000000) 
"""

(do you need more?)

>  What's fbset -i output?

Right after modprobing nvidiafb:

"""
mode "1600x1200-61"
    # D: 160.000 MHz, H: 75.758 kHz, V: 60.606 Hz
    geometry 1600 1200 1600 20889 8
    timings 6250 256 64 46 1 192 3
    accel true
    rgba 8/0,8/0,8/0,0/0
endmode

Frame buffer device information:
    Name        : NV11
    Address     : 0xe0000000
    Size        : 33554432
    Type        : PACKED PIXELS
    Visual      : PSEUDOCOLOR
    XPanStep    : 8
    YPanStep    : 1
    YWrapStep   : 0
    LineLength  : 1600
    MMIO Address: 0xfc000000
    MMIO Size   : 16777216
    Accelerator : Unknown (43)  
"""

After trying fbset "1600x1200":

"""
mode "1600x1200-61"
    # D: 160.000 MHz, H: 75.758 kHz, V: 60.606 Hz
    geometry 1600 1200 1920 17408 8
    timings 6250 256 64 46 1 192 3
    accel true
    rgba 8/0,8/0,8/0,0/0
endmode

Frame buffer device information:
    Name        : NV11
    Address     : 0xe0000000
    Size        : 33554432
    Type        : PACKED PIXELS
    Visual      : PSEUDOCOLOR
    XPanStep    : 8
    YPanStep    : 1
    YWrapStep   : 0
    LineLength  : 1920
    MMIO Address: 0xfc000000
    MMIO Size   : 16777216
    Accelerator : Unknown (43)  
"""

The "1600x1200" mode is:

"""
mode "1600x1200"
  geometry   1600 1200   1920 17467   8
  timings    6172   304 64   46 1   192 3
  hsync high
  vsync high
endmode 
"""

So as you can see the problem is that the timings are NOT set by
fbset. No error messages or anything.

> Can you try doing fbset -accel false and see if it makes a difference?

Nope, same thing. Also with modprobe nvidiafb noaccel=1.

-- 
Giuseppe "Oblomov" Bilotta

"I weep for our generation" -- Charlie Brown