Nouveau - Feb 2008 - [Bug 14703] New: On NV17 on laptop screen: certain resolutions are scrambled

http://bugs.freedesktop.org/show_bug.cgi?id=14703

           Summary: On NV17 on laptop screen: certain resolutions are
                    scrambled
           Product: xorg
           Version: git
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: phillipezolt at gmail.com
         QAContact: xorg-team at lists.x.org
            Blocks: 14405


With git, I am able to use xrandr 1.2 on most of the modes that my laptop
screen
supports. 

However, these resolutions are corrupted when I switch to them: 1152x864
and1024x768.  It is as if the flat panel isn't reading out enough
columns to put on the display.

(For example, if the display is 1024x768, the flat panel might be
showing 1020, and as a result, each line wraps around to the next.)

In 1024x768, my screen kinda looks like the following:
111111111111111111111111111111
111222222222222222222222222222
222223333333333333333333333333
333333333444444444444444444444
444444444444

Notice how it is shifted over more and more as you go down the screen.
...
However, once you get to the middle, the pattern appears to go in the
other direction, but that might just be random garbage.
The upper part of the screen has my gnome-panel, but is just shifted.

I hope that is clear...
...
The rest of the resolutions work.  Here is my xrandr output for reference:

Screen 0: minimum 320 x 200, current 1680 x 1050, maximum 1680 x 1680
VGA-0 disconnected (normal left inverted right x axis y axis)
LVDS-0 connected 1680x1050+0+0 (normal left inverted right x axis y
axis) 331mm x 207mm
  1680x1050      59.9*+   60.0
  1360x768       59.8     60.0
  1280x800       60.0
  1152x864       60.0
  1280x768       60.0
  1280x720       60.0
  1024x768       60.0
  800x600        60.3
  640x480        59.9
....


See bug 14403 for more details about my config.


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--- Comment #1 from Phillip Ezolt <phillipezolt at gmail.com>  2008-02-27
11:07:29 PST ---
Created an attachment (id=14617)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=14617)
Working 1024x768 (with no randr)


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--- Comment #2 from Phillip Ezolt <phillipezolt at gmail.com>  2008-02-27
11:08:09 PST ---
Created an attachment (id=14618)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=14618)
regdump::Working 1152x864 (with no randr)


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--- Comment #3 from Phillip Ezolt <phillipezolt at gmail.com>  2008-02-27
11:08:45 PST ---
Created an attachment (id=14619)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=14619)
regdump::broken 1152x864 (with randr 1.2)


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--- Comment #4 from Phillip Ezolt <phillipezolt at gmail.com>  2008-02-27
11:09:24 PST ---
Created an attachment (id=14620)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=14620)
regdump::broken 1024x768 (with randr 1.2)


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Stuart Bennett <sb476 at cam.ac.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sb476 at cam.ac.uk




--- Comment #5 from Stuart Bennett <sb476 at cam.ac.uk>  2008-02-28
06:45:37 PST ---
Hi, comparative dumps for a working scaled resolution (say 800x600) would be
useful. Also, please state which randr12 scaling modes the problem occurs with
--
different scaling modes can be set with 'xrandr --output LVDS-0 --set
SCALING_MODE <mode>', where <mode> is one of aspect, noscale,
and fullscreen


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--- Comment #6 from Phillip Ezolt <phillipezolt at gmail.com>  2008-02-29
05:41:43 PST ---
Created an attachment (id=14714)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=14714)
regdump: Working 800x600 w/randr 1.2 (Default scaling...Aspect?)

This reg dump is from the 800x600 res in randr 1.2 mode.  It uses the default
scaling mode, which from my other experiments, appears to be 'aspect'.

More info to follow later today. 


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--- Comment #7 from Phillip Ezolt <phillipezolt at gmail.com>  2008-02-29
08:11:58 PST ---
Alright I've run the battery of scaling options on all of the resolutions
that
randr 1.2 reports. 

            Aspect        No Scale       Fullscreen
1360x768     Works         Corrupt            Works
1280x800     Works         Corrupt            Works 
1152x864     Corrupt       Corrupt            Works
1280x768     Works         Corrupt            Works
1280x720     Works         Corrupt            Works
1024x724     Corrupt       Corrupt            SquiggleFont
800x600      Works         Clipped            SquiggleFont
640x480      Works         Clipped            SquiggleFont


'Corrupt' means the screen is corrupted and the lines are shifted as
described
above. 

'Clipped' means the screen is looks correct, but it has been
(significantly)
clipped.  Like I am looking into a small window in the screen. (Centered, btw)

'SquiggleFont' means that I can see the screen as it should be.
(everything is
aligned properly), but the fonts seem to have pixels shifted around.

So, in other words, it is readable, there are definite corruptions. 


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--- Comment #8 from Maarten Maathuis <madman2003 at gmail.com>  2008-02-29
13:12:45 PST ---
Did you ever use the blob and noticed what scaling options nvidia-settings
offered?

Could you make a picture of the SquiggleFont?

Could you check the broken aspect ratio modes, and see if they have some kind
of message like: "scaling resolution for widescreen/portrait
something"


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--- Comment #9 from Maarten Maathuis <madman2003 at gmail.com>  2008-02-29
13:19:04 PST ---
I forgot to add, the message may appear in xorg log, about half way the output
modeset, if that means anything to you.


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--- Comment #10 from Phillip Ezolt <phillipezolt at gmail.com>  2008-03-01
10:43:18 PST ---
>Did you ever use the blob and noticed what scaling options nvidia-settings
> offered?
I used the blob long, long ago. I THINK that it (unlike nv) used something like
aspect.  I remember liking the nv driver better because every mode was
fullscreen. 
> Could you make a picture of the SquiggleFont?
If I try to do a screen shot, it shows up just fine, so it seems like it is
definitely a display problem.  I'll take a picture with my digital camera. 
>Could you check the broken aspect ratio modes, and see if they have some
kind
> of message like: "scaling resolution for widescreen/portrait
something"
Yes.  "Scaling resolution on a widescreen panel" is present in both of
the
broken modes (1152x864, 1024x768). I did notice something that I missed before.
One of the modes is clipped on the bottom. (And it says: Scaling resolution on
a portrait panel)

(BTW.  The panel is natively 1680x1050, but I left that resolution of all of
the tests.)

Here's my exhaustive test results:

                 Result              Scaling_String
   1360x768      Clipped on Bottom   "Scaling resolution on a portrait
panel"
   1280x800      Works               None
   1152x864      Corrupt             "Scaling resolution on a widescreen
panel"
   1280x768      Works               None  
   1280x720      Clipped on Bottom   "Scaling resolution on a portrait
panel"
   1024x768      Corrupt             "Scaling resolution on a widescreen
panel"
   800x600       Clipped on Right    "Scaling resolution on a widescreen
panel"
                  (~100 pixels)
   640x480       Clipped on Right    "Scaling resolution on a widescreen
panel"
                  (~100 pixels)


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--- Comment #11 from Stuart Bennett <sb476 at cam.ac.uk>  2008-03-04
07:35:20 PST ---
Created an attachment (id=14808)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=14808)
Some corrections to the noscale scaling mode

See if this patch helps any with corruption of the noscale modes. If it does,
it's worth seeing if "aspect" works better when
regp->fp_hvalid_start and
regp->fp_hvalid_end do not get set at nv_crtc.c lines ~1380 and ~1400.


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--- Comment #12 from Phillip Ezolt <phillipezolt at gmail.com>  2008-03-06
06:23:38 PST ---
Alright, I've tried the patch.  It completely fixes all of the
"non-scaled"
resolutions. (None of them are corrupt.) 

I still have to:
1) Take a Picture of squiggle font
2) Try the other fix you suggested for aspect. 

Here's my status with head+your patch: 

            Aspect        No Scale       Fullscreen
1360x768     Bottom Clip    Works             Works
1280x800     Works          Works             Works 
1152x864     Corrupt        Works             Works
1280x768     Works          Works             Works
1280x720     Bottom Clip    Works             Works
1024x768     Corrupt        Works             SquiggleFont
800x600      Right Clip     Works             SquiggleFont
640x480      Right Clip     Works             SquiggleFont


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--- Comment #13 from Stuart Bennett <sb476 at cam.ac.uk>  2008-03-13
19:16:58 PST ---
Hi, have you had any time to look at these remaining issues? I'd be very
interested in the outcome of 2) especially


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--- Comment #14 from Phillip Ezolt <phillipezolt at gmail.com>  2008-03-16
04:09:33 PST ---
(In reply to comment #13)
> Hi, have you had any time to look at these remaining issues? I'd be
very
> interested in the outcome of 2) especially
> 
Sorry. Didn't mean to fall off the face of the Earth.  Real life got in the
way.  I'll give it a try later today. 

Cheers,
--Phil


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--- Comment #15 from Phillip Ezolt <phillipezolt at gmail.com>  2008-03-16
16:24:42 PST ---
Ok.  I tried the suggested change and it did make things better.

The output of "aspect" resolutions exactly matched those of the
"fullscreen"
resolutions.  So, for every resolution, none were clipped. 

This is definitely a step in the right direction.  However, since the output
filled up the entire screen, it DIDN'T maintain the aspect ratio (like the
mode's name implies...)   Maybe that's the best we can do...

BTW.  I have pictures of the "squiggle font" which I'll be
uploading shortly.


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--- Comment #16 from Phillip Ezolt <phillipezolt at gmail.com>  2008-03-16
16:44:41 PST ---
Alright, bugzilla won't let me attach these images... Too big.

Squiggle font @ 1024x768:
http://www.mediafire.com/?nnb7tmxl22f

Squiggle font @ 800x600:
(Notice that the screen also looks shifted to the right)
http://www.mediafire.com/?di1t3xwtwxh

Squiggle font @640x480:
(The screen looks rotated here, too..)
http://www.mediafire.com/?xui1mzwmc2f


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--- Comment #17 from Stuart Bennett <sb476 at cam.ac.uk>  2008-03-16
18:45:49 PST ---
Ok, I've merged up the noscale fix for now. Perhaps aspect is too much to
hope
for (do you have the binary blob installed -- if so, does nvidia-settings let
you choose aspect scaling?), but fullscreen should work, since it does in
non-randr.

So:
1) verify that non-randr scaling works at the problematic resolutions *after*
randr12 has been used (i.e. no reboot between)
2) add to this bug the output of "radeontool regmatch $reg", for $reg
of
0x680884, 0x682884, 0x680888, 0x682888


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--- Comment #18 from Pekka Paalanen <pq at iki.fi>  2009-08-09 01:13:50
PST ---
Randr 1.2 is now mandatory. Any news on this bug? How about KMS?


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Pekka Paalanen <pq at iki.fi> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED




--- Comment #19 from Pekka Paalanen <pq at iki.fi>  2009-11-19 13:38:51
PST ---
No reply from the reporter or the bug. Assuming one of them is dead. Closing as
fixed.


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