PCI configuration space of the VGA controller and laptop LCD picture quality.

PCI configuration space of the VGA controller and laptop LCD picture quality.

[SD]

Dear All.

I still can't figure out why Fedora (13,14,15) shows LCD picture much worse then opensuse 11.1.

So my next question - can it be because of different PCI configuration space of my
00:02.0 VGA compatible controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 04).

"lspci -xxxx" gives me different outputs on fedora and opensuse although both of them are installed on the same laptop, on the same HD and use the same hardware.

As long as I still want to use Fedora on my laptop I would like to ask - can picture quality be spoiled by different PCI configuration?

Thanks in advance.

Re: PCI configuration space of the VGA controller and laptop LCD picture quality.

[Felix Miata]

On 2011/01/13 11:58 (GMT-0800) SD composed:

> I still can't figure out why Fedora (13,14,15) shows LCD picture much
> worse then opensuse 11.1.

What does "worse" mean? Most people who see "worse" are actually complaining
about fonts, and in most cases even then they don't define what is "worse"
about the fonts. Can you upload screenshots of both so people can see what
"worse" means?

That said, Fedora sets some system wide variables that affect X
quality/behavior in /etc/X11/Xresources:

Xft.dpi
Xft.hintstyle
Xft.hinting

openSUSE doesn't do that. If you comment those away in Fedora, or match the
Xft.dpi number to your LCD's actual DPI, you may find the difference is
reduced or disappears, particularly if actual DPI varies more than nominally
from the Xft.dpi setting. OTOH, they may produce little or no improvement if
you've set your DTE to force DPI or tweaked its font smoothing settings.

If you need to comment further, also specify which DTE you use, as that can
matter as well in future responses.

> As long as I still want to use Fedora on my laptop I would like to ask -
> can picture quality be spoiled by different PCI configuration?

I highly doubt it, other than if it's wrong there's no picture to assess the
quality of.
-- 
"How much better to get wisdom than gold, to choose
understanding rather than silver." Proverbs 16:16 NKJV

  Team OS/2 ** Reg. Linux User #211409

Felix Miata  ***  http://fm.no-ip.com/

Re: PCI configuration space of the VGA controller and laptop LCD picture quality.

[SD]

--- On Thu, 1/13/11, Felix Miata <mrmazda@earthlink.net> wrote:

> From: Felix Miata <mrmazda@earthlink.net>
> Subject: Re: [Intel-gfx] PCI configuration space of the VGA controller and laptop LCD picture quality.
> To: intel-gfx@lists.freedesktop.org
> Date: Thursday, January 13, 2011, 11:29 PM
> On 2011/01/13 11:58 (GMT-0800) SD
> composed:
> 
> > I still can't figure out why Fedora (13,14,15) shows
> LCD picture much
> > worse then opensuse 11.1.
> 
> What does "worse" mean? Most people who see "worse" are
> actually complaining
> about fonts, and in most cases even then they don't define
> what is "worse"
> about the fonts. Can you upload screenshots of both so
> people can see what
> "worse" means?
> 
> That said, Fedora sets some system wide variables that
> affect X
> quality/behavior in /etc/X11/Xresources:
> 
> Xft.dpi
> Xft.hintstyle
> Xft.hinting
> 
> openSUSE doesn't do that. If you comment those away in
> Fedora, or match the
> Xft.dpi number to your LCD's actual DPI, you may find the
> difference is
> reduced or disappears, particularly if actual DPI varies
> more than nominally
> from the Xft.dpi setting. OTOH, they may produce little or
> no improvement if
> you've set your DTE to force DPI or tweaked its font
> smoothing settings.
> 
> If you need to comment further, also specify which DTE you
> use, as that can
> matter as well in future responses.
> 
> > As long as I still want to use Fedora on my laptop I
> would like to ask -
> > can picture quality be spoiled by different PCI
> configuration?
> 
> I highly doubt it, other than if it's wrong there's no
> picture to assess the
> quality of.
> -- "How much better to get wisdom than gold, to choose
> understanding rather than silver." Proverbs 16:16 NKJV
> 
>  Team OS/2 ** Reg. Linux User #211409
> 
> Felix Miata  ***  http://fm.no-ip.com/
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 

Thanks for the answer and questions.

Picture quality I meant is what I think after some bad experience with Fedora 13, 14 and now rawhide 15 it is backlight, it is not solid or smooth like on opensuse 11.1. On all fedora it looks like backlight flickers, and it doesn't make picture solid (smooth).

I check everything and compare everything I can. It is not font, or DPI because both OS on the same laptop and I made exactly the same settings.
But after less then an hour on Fedora my eyes start aching. I start to suspect backlight frequency or something else, because first that one can notice is higher screen brightness and therefor colors are brighter also. I did the same xgamma settings, backlight level is also the same.
 
Only thing is different, which I can see myself (and find myself) is PCI configuration.
Latter I will send here picture of screen with different colors from opensuse and fedora, also video PCI memory dump


      

Re: PCI configuration space of the VGA controller and laptop LCD picture quality.

[SD]

Ok. Some outputs:
1. On Fedora 14

$ xrandr --verbose
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 4096 x 4096
LVDS1 connected 1024x768+0+0 (0x42) normal (normal left inverted right x axis y axis) 304mm x 228mm
        Identifier: 0x41
        Timestamp:  24882
        Subpixel:   horizontal rgb
        Gamma:      1.4:1.4:1.4
        Brightness: 1.0
        Clones:    
        CRTC:       1
        CRTCs:      1
        Transform:  
                    1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
                   filter: 
        EDID:
                00ffffffffffff0006af512400000000
                010f0103801e17780a87f594574f8c27
                27505400000001010101010101010101
                01010101010164190040410026301888
                360030e4100000180000000f00000000
                00000000000000000020000000fe0041
                554f0a202020202020202020000000fe
                004231353058473032205634200a0000
        scaling mode:   Full aspect
                supported: None         Full         Center       Full aspect 
  1024x768 (0x42)   65.0MHz -HSync -VSync *current +preferred
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock   48.4KHz
        v: height  768 start  771 end  777 total  806           clock   60.0Hz

00:02.0 VGA compatible controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 04)
00: 86 80 92 25 07 00 90 00 04 00 00 03 00 00 80 00
10: 00 00 00 d0 01 e0 00 00 08 00 00 a0 00 00 08 d0
20: 00 00 00 00 00 00 00 00 00 00 00 00 aa 17 62 20
30: 00 00 00 00 d0 00 00 00 00 00 00 00 0b 01 00 00
40: 00 00 00 00 e0 00 00 00 09 00 09 21 02 a2 8b 90
50: 0a 00 30 00 19 00 00 b8 00 00 00 00 00 00 80 5f
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 01 00 22 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f0: 00 00 64 34 00 00 00 00 00 00 05 00 00 00 00 00



On OpenSuse 11.1

xrandr --verbose
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 2048 x 1200
LVDS connected 1024x768+0+0 (0x3c) normal (normal left inverted right x axis y axis) 304mm x 228mm
        Identifier: 0x3b
        Timestamp:  28235
        Subpixel:   horizontal rgb
        Clones:    
        CRTC:       1
        CRTCs:      1
        EDID_DATA:
                00ffffffffffff0006af512400000000
                010f0103801e17780a87f594574f8c27
                27505400000001010101010101010101
                01010101010164190040410026301888
                360030e4100000180000000f00000000
                00000000000000000020000000fe0041
                554f0a202020202020202020000000fe
                004231353058473032205634200a0000
        PANEL_FITTING: full
                supported: center       full_aspect  full        
        BACKLIGHT_CONTROL: combination
                supported: native       legacy       combination  kernel      
        BACKLIGHT: 15625 (0x00003d09) range:  (0,15625)
  1024x768 (0x3c)   65.0MHz -HSync -VSync *current +preferred
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock   48.4KHz
        v: height  768 start  771 end  777 total  806           clock   60.0Hz


00:02.1 Display controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 04)
00: 86 80 92 27 07 00 90 00 04 00 80 03 00 00 80 00
10: 00 00 10 d0 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 aa 17 62 20
30: 00 00 00 00 d0 00 00 00 00 00 00 00 00 00 00 00
40: 00 00 00 00 e0 00 00 00 09 00 09 21 02 a2 8b 90
50: 0a 00 30 00 19 00 00 b8 00 00 00 00 00 00 80 5f
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 01 00 22 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f0: 00 00 64 34 01 00 00 00 00 00 05 00 00 00 00 00


As you all can see the configuration of the pci video is different and screen picture is different. Can it be connected?


Thank you.