[Bug 76861] New: radeon: flickering horizontal stripes/lines

[Bug 76861] New: radeon: flickering horizontal stripes/lines

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=76861

            Bug ID: 76861
           Summary: radeon: flickering horizontal stripes/lines
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.15-rc6
          Hardware: i386
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: sven.dziadek@gmx.de
                CC: bugspam@moreofthesa.me.uk, deathsimple@vodafone.de
        Regression: No

Created attachment 137301
  --> https://bugzilla.kernel.org/attachment.cgi?id=137301&action=edit
Video of my monitor

Maybe duplicate of https://bugzilla.kernel.org/show_bug.cgi?id=75921

Recent DRI updates trigger a strange bug with my Radeon graphics card.
Horizontal lines flicker. These stripes/ lines start from the right edge of the
screen and have different lengths. All colors are visible. The amount of lines
depends on the speed of diplay changes. In games/ console scrolling, there is a
lot of them. If the pc is idle, I don't see any. Occurs also in tty1 on the
text console.
I appended a bad-quality video showing this issue. Sorry for the quality, but
screencast programs don't record the problem, only the picture as it should be.

With 3.15-rc1 it still works fine. In later Kernels, it is black without
output.
>From somewhere between 3.15-rc3 and 3.15-rc4 (when the black-screen-issue is
fixed), theses stripes are visible. They are still there in latest commit:
1ee1ceafb572f1a925809168267a7962a4289de8

Graphics card is onboard:
01:05.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RS880
[Radeon HD 4200] (prog-if 00 [VGA controller])
Monitor is attached over DVI.

I haven't found any errors in syslog. Tell me if you need some more info.

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[Bug 76861] radeon: flickering horizontal stripes/lines

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https://bugzilla.kernel.org/show_bug.cgi?id=76861

--- Comment #1 from Christian König <deathsimple@vodafone.de> ---
Created attachment 137371
  --> https://bugzilla.kernel.org/attachment.cgi?id=137371&action=edit
Possible fix

Might be caused by the recent PLL changes. Does the attached patch helps?

Also please provide dmesg output generated with drm.debug=0xE on the kernel
commandline.

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[Bug 76861] radeon: flickering horizontal stripes/lines

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https://bugzilla.kernel.org/show_bug.cgi?id=76861

--- Comment #2 from Sven Dziadek <sven.dziadek@gmx.de> ---
Created attachment 137401
  --> https://bugzilla.kernel.org/attachment.cgi?id=137401&action=edit
dmesg output with patch applied

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[Bug 76861] radeon: flickering horizontal stripes/lines

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--- Comment #3 from Sven Dziadek <sven.dziadek@gmx.de> ---
The patch did not change anything for me. The flickering lines are still
there..

Maybe the dmesg output will help?
Thanks

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[Bug 76861] radeon: flickering horizontal stripes/lines

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https://bugzilla.kernel.org/show_bug.cgi?id=76861

--- Comment #4 from Christian König <deathsimple@vodafone.de> ---
(In reply to Sven Dziadek from comment #3)
> Maybe the dmesg output will help?

The logs show that your system indeed seems to be affected by the patch. Can
you try even lower values than 114 and see if it changes anything?

Also please provide the dmesg output with rc1 where it still worked fine.

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[Bug 76861] radeon: flickering horizontal stripes/lines

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https://bugzilla.kernel.org/show_bug.cgi?id=76861

--- Comment #5 from Sven Dziadek <sven.dziadek@gmx.de> ---
Created attachment 137421
  --> https://bugzilla.kernel.org/attachment.cgi?id=137421&action=edit
patched with value 107

Value 107 works for me. I am currently testing which is the highest value
working for me. I think, this is what you need?

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[Bug 76861] radeon: flickering horizontal stripes/lines

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--- Comment #6 from Sven Dziadek <sven.dziadek@gmx.de> ---
Created attachment 137431
  --> https://bugzilla.kernel.org/attachment.cgi?id=137431&action=edit
dmesg output for (still working) Kernel 3.15-rc1

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[Bug 76861] radeon: flickering horizontal stripes/lines

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https://bugzilla.kernel.org/show_bug.cgi?id=76861

--- Comment #7 from Christian König <deathsimple@vodafone.de> ---
(In reply to Sven Dziadek from comment #5)
> Created attachment 137421 [details]
> patched with value 107
> 
> Value 107 works for me. I am currently testing which is the highest value
> working for me. I think, this is what you need?

The highest working value would be nice indeed, but the problem is that the
numbers get reduced once more after applying the limit.

For example with the value 105 the ratio of 11292/105 gets reduced to 3764/35
(both sides divided by 3) before it is send to the hardware.

Take a look at the following lines in the log and try different values between
100 and 114:
[drm:radeon_compute_pll_avivo] 154000 - 154000, pll dividers - fb: 376.4 ref:
5, post 7

A value below 100 is known to not work correctly for some users, values above
128 doesn't work for some other users. We essentially need to figure out the
sweet spot in between.

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[Bug 76861] radeon: flickering horizontal stripes/lines

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https://bugzilla.kernel.org/show_bug.cgi?id=76861

--- Comment #8 from Sven Dziadek <sven.dziadek@gmx.de> ---
So, I tried different values. First, I was not paying enough attention. Because
with value 112 and 113, there are very few lines appearing.

Value 111 is the one where I did not see any lines until now.
[drm:radeon_compute_pll_avivo] 154000 - 154000, pll dividers - fb: 376.4 ref:
5, post 7
Is the corresponding line in the dmesg.

Is that all you need? And thanks for your work!

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[Bug 76861] radeon: flickering horizontal stripes/lines

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--- Comment #9 from Christian König <deathsimple@vodafone.de> ---
(In reply to Sven Dziadek from comment #8)
> Is that all you need? And thanks for your work!

What happens when you use 108, 109 or 110?

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[Bug 76861] radeon: flickering horizontal stripes/lines

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https://bugzilla.kernel.org/show_bug.cgi?id=76861

--- Comment #10 from Sven Dziadek <sven.dziadek@gmx.de> ---
Ok, for value 111 and smaller, I don't see any lines or stripes. I have not
tried all possible values, but I assume, this is not necessary.

For the values I tried, I can give you the corresponding dmesg entries:
dmesg.log_rc1: 154000 - 15752, pll dividers - fb: 154.0 ref: 2, post 7
dmesg.log_pll_105: 154000 - 154000, pll dividers - fb: 376.4 ref: 5, post 7
dmesg.log_pll_107: 154000 - 154000, pll dividers - fb: 376.4 ref: 5, post 7
dmesg.log_pll_108: 154000 - 154000, pll dividers - fb: 376.4 ref: 5, post 7
dmesg.log_pll_109: 154000 - 154000, pll dividers - fb: 376.4 ref: 5, post 7
dmesg.log_pll_110: 154000 - 154000, pll dividers - fb: 376.4 ref: 5, post 7
dmesg.log_pll_111: 154000 - 154000, pll dividers - fb: 376.4 ref: 5, post 7
dmesg.log_pll_112: 154000 - 154000, pll dividers - fb: 1204.5 ref: 16, post 7
dmesg.log_pll_113: 154000 - 154000, pll dividers - fb: 1204.5 ref: 16, post 7
dmesg.log_pll_114: 154000 - 154000, pll dividers - fb: 1226.0 ref: 19, post 6

Tell me when you need more values or more parts of the dmesg logs.

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[Bug 76861] radeon: flickering horizontal stripes/lines

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https://bugzilla.kernel.org/show_bug.cgi?id=76861

--- Comment #11 from Christian König <deathsimple@vodafone.de> ---
What happens if you comment out "avivo_reduce_ratio(&fb_div, &ref_div,
fb_div_min, ref_div_min);" ?

The problem is that values smaller than 112 doesn't give us a ref divider of 15
instead we get a divider of 5 because the feedback divider is dividable by 3 as
well.

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[Bug 76861] radeon: flickering horizontal stripes/lines

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https://bugzilla.kernel.org/show_bug.cgi?id=76861

--- Comment #12 from Sven Dziadek <sven.dziadek@gmx.de> ---
Ok, new report ;-)
With this line commented out, the lines reappear.

I tried with these values:
dmesg.log_pll_105: 154000 - 154000, pll dividers - fb: 1129.2 ref: 15, post 7
dmesg.log_pll_110: 154000 - 154000, pll dividers - fb: 1129.2 ref: 15, post 7
dmesg.log_pll_111: 154000 - 154000, pll dividers - fb: 1129.2 ref: 15, post 7
dmesg.log_pll_112: 154000 - 154000, pll dividers - fb: 1204.5 ref: 16, post 7
All of them  contain stripes/ lines.

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[Bug 76861] radeon: flickering horizontal stripes/lines

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--- Comment #13 from Christian König <deathsimple@vodafone.de> ---
Crap, I freared that this could happen.

Please try values of 50,60,70,80,90 as well and see where the limit is that the
lines disapear.

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[Bug 76861] radeon: flickering horizontal stripes/lines

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https://bugzilla.kernel.org/show_bug.cgi?id=76861

--- Comment #14 from Sven Dziadek <sven.dziadek@gmx.de> ---
I tried some more values.
With the line commented out, the lines appear with value 80 and higher. They do
not appear with value 70 and lower. I did not try 60 or any values between 70
and 80. Do you need it more detailed?

dmesg.log_pll_50: 154000 - 153990, pll dividers - fb: 516.2 ref: 8, post 6
dmesg.log_pll_70: 154000 - 154000, pll dividers - fb: 752.8 ref: 10, post 7
dmesg.log_pll_80: 154000 - 153990, pll dividers - fb: 838.8 ref: 13, post 6
dmesg.log_pll_90: 154000 - 154000, pll dividers - fb: 967.9 ref: 15, post 6

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Sven Dziadek <sven.dziadek@gmx.de> changed:

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

--- Comment #15 from Sven Dziadek <sven.dziadek@gmx.de> ---
The new 3.15-rc8 works fine for me.

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