Nouveau - Dec 2012 - [Bug 57988] New: [regression][bisected][NV4E] LVDS output has offset to the right, part falling of is painted on the left

https://bugs.freedesktop.org/show_bug.cgi?id=57988

          Priority: medium
            Bug ID: 57988
          Assignee: nouveau at lists.freedesktop.org
           Summary: [regression][bisected][NV4E] LVDS output has offset to
                    the right, part falling of is painted on the left
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: ronald645 at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/nouveau
           Product: xorg

Created attachment 71137
  --> https://bugs.freedesktop.org/attachment.cgi?id=71137&action=edit
Dmesg of regression: 3.7-rc8+nouveau(implement opcode 0xa9)

Commit:

767baf828498: drm/nouveau: remove some more unnecessary legacy bios code

causes a regression. Attached are dmesg logs and photographs (since the title
probably won't cut it).

Symptoms are:

- screen is dislocated to the right causing part of the screen to fall off
- the part that falls of the screen is improperly repainted on the left side,
seems like a mirror effect in that this repainting is happening twice
- upper part of the screen has a horizontal bar that is probably 1 or 2 pixels
thick. Desktop is displayed there, but it's scrambled.

This is with an 'C51 (NV4E)' chipset.

Mupuf on #nouveau mentioned removing the ' #if 0 / #endif ' parts in
this
commit and see if that rebuilds. I added 'pll_limit_tbl_ptr' back to
nouveau_bios.h to make it compile. This does not help. Bug is still there. The
dmesg log 'attempt' contains the dmesg output with this modification.

Mupuf also mentioned that 'it clearly is a PLL calculation problem'.
Therefore,
I also refer back to previous fdo bug #56202 . This was also related to
'PLL'
(I have no idea what it is though)...

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Ronald <ronald645 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |regression

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Ronald <ronald645 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[regression][bisected][NV4E |[regression][bisected][NV4E
                   |] LVDS output has offset to |] LVDS output has offset to
                   |the right, part falling of  |the right, part falling of
                   |is painted on the left      |is incorrectly painted on
                   |                            |the left

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--- Comment #1 from Ronald <ronald645 at gmail.com> ---
Created attachment 71138
  --> https://bugs.freedesktop.org/attachment.cgi?id=71138&action=edit
Dmesg of regression: 3.7-rc8+nouveau('implement opcode 0xa9')(reverted:
'remove
some more unnecessary legacy bios code')

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--- Comment #2 from Ronald <ronald645 at gmail.com> ---
Created attachment 71140
  --> https://bugs.freedesktop.org/attachment.cgi?id=71140&action=edit
Dmesg of regression: 3.7-rc8+nouveau(implement opcode 0xa9)+remove '#if 0 /
#endif' as mentioned by mupuf

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Ronald <ronald645 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #71138|Dmesg of regression:        |Dmesg of 'reverted'
        description|3.7-rc8+nouveau('implement  |regression:
                   |opcode 0xa9')(reverted:    
|3.7-rc8+nouveau('implement
                   |'remove some more           |opcode 0xa9')(reverted:
                   |unnecessary legacy bios     |'remove some more
                   |code')                      |unnecessary legacy bios
                   |                            |code')

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--- Comment #3 from Ronald <ronald645 at gmail.com> ---
Created attachment 71141
  --> https://bugs.freedesktop.org/attachment.cgi?id=71141&action=edit
Corrupted KMS console, sorry for the bad quality

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--- Comment #4 from Ronald <ronald645 at gmail.com> ---
Created attachment 71142
  --> https://bugs.freedesktop.org/attachment.cgi?id=71142&action=edit
Left side corruption; shown with lightdm

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Ronald <ronald645 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #71142|0                           |1
        is obsolete|                            |

--- Comment #5 from Ronald <ronald645 at gmail.com> ---
Created attachment 71144
  --> https://bugs.freedesktop.org/attachment.cgi?id=71144&action=edit
Left side corruption; shown with lightdm

grrr

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--- Comment #6 from Ronald <ronald645 at gmail.com> ---
Created attachment 71145
  --> https://bugs.freedesktop.org/attachment.cgi?id=71145&action=edit
Upper side corruption; shown with e17

The two significant dots used to be part of the cursor ... :/

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--- Comment #7 from Ronald <ronald645 at gmail.com> ---
Created attachment 71146
  --> https://bugs.freedesktop.org/attachment.cgi?id=71146&action=edit
Diff of regressed and non-regressed (with revert) dmesg

Maybe it helps..

P.S. I was not able to increase the debug level by passing nouveau.debug=5 tot
the kernel command line.

Any pointers on that one??

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--- Comment #8 from Emil Velikov <emil.l.velikov at gmail.com> ---
Created attachment 71147
  --> https://bugs.freedesktop.org/attachment.cgi?id=71147&action=edit
Quick fix

Can you give this patch a try

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--- Comment #9 from Ronald <ronald645 at gmail.com> ---
Said patch fixes this bug. Thanks a ton!

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Emil Velikov <emil.l.velikov at gmail.com> changed:

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

--- Comment #10 from Emil Velikov <emil.l.velikov at gmail.com> ---
Thanks for the quick bisect and testing :)

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