[Bug 83461] New: hdmi screen flicker/unusable

[Bug 83461] New: hdmi screen flicker/unusable

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=83461

            Bug ID: 83461
           Summary: hdmi screen flicker/unusable
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.15, 3.16
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: kb@spatium.org
        Regression: No

Since kernel 3.15 I cannot get a stable video output on HDMI. The screen
flickers and blinks, and my dmesg is full of these:

sound hdaudioC1D0: HDMI ATI/AMD: no speaker allocation for ELD

The video card in question is:
Advanced Micro Devices, Inc. [AMD/ATI] RS880 [Radeon HD 4200]

Downgrading to 3.14 seems to remove the issue.

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[Bug 83461] hdmi screen flicker/unusable

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Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com

--- Comment #1 from Alex Deucher <alexdeucher@gmail.com> ---
Does booting with radeon.audio=0 on the kernel command line in grub fix the
issue?  You can also disable audio on the fly xrandr.  E.g.,

xrandr --output HDMI-0 --set audio off

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[Bug 83461] hdmi screen flicker/unusable

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kb@spatium.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Regression|No                          |Yes

--- Comment #2 from kb@spatium.org ---
I haven't tried myself, but according to publicly available forums it would
help. However, I need hdmi audio working, so I can't use this as a workaround.

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[Bug 83461] hdmi screen flicker/unusable

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--- Comment #3 from Alex Deucher <alexdeucher@gmail.com> ---
Can you try it to be sure to at least narrow down what the problem might be?

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[Bug 83461] hdmi screen flicker/unusable

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--- Comment #4 from kb@spatium.org ---
ok i tried it and surprisingly it does not help. I have flicker, but i don't
get the ELD messages.
Note I also use video=HDMI-A-1:640x480 for the kernel to get a usable
resolution in the text console.

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--- Comment #5 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to kb from comment #0)
> 
> Downgrading to 3.14 seems to remove the issue.

Can you bisect to find out what change caused this regression?

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--- Comment #6 from kb@spatium.org ---
I'll have to setup the enviro, it'll take some time. But yeah, I'll do it.

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--- Comment #7 from kb@spatium.org ---
32167016076f714f0e35e287fbead7de0f1fb179 is the first bad commit
commit 32167016076f714f0e35e287fbead7de0f1fb179
Author: Christian König <christian.koenig@amd.com>
Date:   Fri Mar 28 18:55:10 2014 +0100

    drm/radeon: rework finding display PLL numbers v2

    This completely reworks how the PLL parameters are generated and
    should result in better matching dot clock frequencies.

    Probably needs quite a bit of testing.

    bugs: https://bugs.freedesktop.org/show_bug.cgi?id=76564

    v2: more cleanup and comments.

    Signed-off-by: Christian König <christian.koenig@amd.com>
    Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

:040000 040000 1a91914271fc3761ec6961fa0cc4bded879bd05c
c0ab21500dcb8d2876f4744e4465c9aa7203a113 M    drivers

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[Bug 83461] hdmi screen flicker/unusable

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--- Comment #8 from kb@spatium.org ---
Also, I've noticed that when X boots, the "good" kernels give this sequence:
1) TV blanks with "No signal" message briefly
2) Desktop shows normally
And the "bad" kernels give:
1) TV blanks with "Mode not supported" message for a longer time
2) Desktop shows, blinking and/or flickering

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--- Comment #9 from Christian König <deathsimple@vodafone.de> ---
Please provide the output of "xrandr --verbose" and of dmesg when booted with
"drm.debug=0xe" on the kernel command line.

Thanks,
Christian.

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[Bug 83461] hdmi screen flicker/unusable

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https://bugzilla.kernel.org/show_bug.cgi?id=83461

--- Comment #10 from kb@spatium.org ---
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
VGA-0 disconnected (normal left inverted right x axis y axis)
    Identifier: 0x51
    Timestamp:  20519
    Subpixel:   no subpixels
    Clones:    
    CRTCs:      0 1
    Transform:  1.000000 0.000000 0.000000
                0.000000 1.000000 0.000000
                0.000000 0.000000 1.000000
               filter: 
    load detection: 1 
        range: (0, 1)
HDMI-0 connected 1920x1080+0+0 (0x54) normal (normal left inverted right x axis
y axis) 160mm x 90mm
    Identifier: 0x52
    Timestamp:  20519
    Subpixel:   horizontal rgb
    Gamma:      1.0:1.0:1.0
    Brightness: 1.0
    Clones:    
    CRTC:       0
    CRTCs:      0 1
    Transform:  1.000000 0.000000 0.000000
                0.000000 1.000000 0.000000
                0.000000 0.000000 1.000000
               filter: 
    EDID: 
        00ffffffffffff004c2d090501000000
        30120103801009780aee91a3544c9926
        0f5054bdef80714f8100814081809500
        950fb3000101023a801871382d40582c
        4500a05a0000001e662150b051001b30
        40703600a05a0000001e000000fd0018
        4b1a5117000a202020202020000000fc
        0053414d53554e470a2020202020016f
        020327f14b901f041305140312202122
        2309070783010000e2000fe305030167
        030c003000b82d011d007251d01e206e
        285500a05a0000001e011d00bc52d01e
        20b8285540a05a0000001e011d801871
        1c1620582c2500a05a0000009e011d80
        d0721c1620102c2580a05a0000009e00
        000000000000000000000000000000fd
    dither: off 
        supported: off, on
    audio: auto 
        supported: off, on, auto
    underscan vborder: 0 
        range: (0, 128)
    underscan hborder: 0 
        range: (0, 128)
    underscan: off 
        supported: off, on, auto
    coherent: 1 
        range: (0, 1)
  1920x1080 (0x54) 148.500MHz +HSync +VSync *current +preferred
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock  67.50KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  60.00Hz
  1920x1080 (0x55) 148.500MHz +HSync +VSync
        h: width  1920 start 2448 end 2492 total 2640 skew    0 clock  56.25KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  50.00Hz
  1920x1080 (0x56) 148.352MHz +HSync +VSync
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock  67.43KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  59.94Hz
  1920x1080i (0x57) 74.250MHz +HSync +VSync Interlace
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock  33.75KHz
        v: height 1080 start 1084 end 1094 total 1125           clock  60.00Hz
  1920x1080i (0x58) 74.250MHz +HSync +VSync Interlace
        h: width  1920 start 2448 end 2492 total 2640 skew    0 clock  28.12KHz
        v: height 1080 start 1084 end 1094 total 1125           clock  50.00Hz
  1920x1080 (0x59) 74.250MHz +HSync +VSync
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock  33.75KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  30.00Hz
  1920x1080 (0x5a) 74.250MHz +HSync +VSync
        h: width  1920 start 2448 end 2492 total 2640 skew    0 clock  28.12KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  25.00Hz
  1920x1080 (0x5b) 74.250MHz +HSync +VSync
        h: width  1920 start 2558 end 2602 total 2750 skew    0 clock  27.00KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  24.00Hz
  1920x1080i (0x5c) 74.176MHz +HSync +VSync Interlace
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock  33.72KHz
        v: height 1080 start 1084 end 1094 total 1125           clock  59.94Hz
  1920x1080 (0x5d) 74.176MHz +HSync +VSync
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock  33.72KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  29.97Hz
  1920x1080 (0x5e) 74.176MHz +HSync +VSync
        h: width  1920 start 2558 end 2602 total 2750 skew    0 clock  26.97KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  23.98Hz
  1680x1050 (0x5f) 119.000MHz +HSync -VSync
        h: width  1680 start 1728 end 1760 total 1840 skew    0 clock  64.67KHz
        v: height 1050 start 1053 end 1059 total 1080           clock  59.88Hz
  1280x1024 (0x60) 135.000MHz +HSync +VSync
        h: width  1280 start 1296 end 1440 total 1688 skew    0 clock  79.98KHz
        v: height 1024 start 1025 end 1028 total 1066           clock  75.02Hz
  1280x1024 (0x61) 108.000MHz +HSync +VSync
        h: width  1280 start 1328 end 1440 total 1688 skew    0 clock  63.98KHz
        v: height 1024 start 1025 end 1028 total 1066           clock  60.02Hz
  1440x900 (0x62) 136.750MHz -HSync +VSync
        h: width  1440 start 1536 end 1688 total 1936 skew    0 clock  70.64KHz
        v: height  900 start  903 end  909 total  942           clock  74.98Hz
  1440x900 (0x63) 88.750MHz +HSync -VSync
        h: width  1440 start 1488 end 1520 total 1600 skew    0 clock  55.47KHz
        v: height  900 start  903 end  909 total  926           clock  59.90Hz
  1280x960 (0x64) 108.000MHz +HSync +VSync
        h: width  1280 start 1376 end 1488 total 1800 skew    0 clock  60.00KHz
        v: height  960 start  961 end  964 total 1000           clock  60.00Hz
  1360x768 (0x65) 85.500MHz +HSync +VSync
        h: width  1360 start 1424 end 1536 total 1792 skew    0 clock  47.71KHz
        v: height  768 start  771 end  777 total  795           clock  60.02Hz
  1280x800 (0x66) 71.000MHz +HSync -VSync
        h: width  1280 start 1328 end 1360 total 1440 skew    0 clock  49.31KHz
        v: height  800 start  803 end  809 total  823           clock  59.91Hz
  1152x864 (0x67) 108.000MHz +HSync +VSync
        h: width  1152 start 1216 end 1344 total 1600 skew    0 clock  67.50KHz
        v: height  864 start  865 end  868 total  900           clock  75.00Hz
  1280x720 (0x68) 74.250MHz +HSync +VSync
        h: width  1280 start 1390 end 1430 total 1650 skew    0 clock  45.00KHz
        v: height  720 start  725 end  730 total  750           clock  60.00Hz
  1280x720 (0x69) 74.250MHz +HSync +VSync
        h: width  1280 start 1720 end 1760 total 1980 skew    0 clock  37.50KHz
        v: height  720 start  725 end  730 total  750           clock  50.00Hz
  1280x720 (0x6a) 74.176MHz +HSync +VSync
        h: width  1280 start 1390 end 1430 total 1650 skew    0 clock  44.96KHz
        v: height  720 start  725 end  730 total  750           clock  59.94Hz
  1024x768 (0x6b) 78.800MHz +HSync +VSync
        h: width  1024 start 1040 end 1136 total 1312 skew    0 clock  60.06KHz
        v: height  768 start  769 end  772 total  800           clock  75.08Hz
  1024x768 (0x6c) 75.000MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1328 skew    0 clock  56.48KHz
        v: height  768 start  771 end  777 total  806           clock  70.07Hz
  1024x768 (0x6d) 65.000MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock  48.36KHz
        v: height  768 start  771 end  777 total  806           clock  60.00Hz
  832x624 (0x6e) 57.284MHz -HSync -VSync
        h: width   832 start  864 end  928 total 1152 skew    0 clock  49.73KHz
        v: height  624 start  625 end  628 total  667           clock  74.55Hz
  800x600 (0x6f) 50.000MHz +HSync +VSync
        h: width   800 start  856 end  976 total 1040 skew    0 clock  48.08KHz
        v: height  600 start  637 end  643 total  666           clock  72.19Hz
  800x600 (0x70) 49.500MHz +HSync +VSync
        h: width   800 start  816 end  896 total 1056 skew    0 clock  46.88KHz
        v: height  600 start  601 end  604 total  625           clock  75.00Hz
  800x600 (0x71) 40.000MHz +HSync +VSync
        h: width   800 start  840 end  968 total 1056 skew    0 clock  37.88KHz
        v: height  600 start  601 end  605 total  628           clock  60.32Hz
  720x576 (0x72) 27.000MHz -HSync -VSync
        h: width   720 start  732 end  796 total  864 skew    0 clock  31.25KHz
        v: height  576 start  581 end  586 total  625           clock  50.00Hz
  720x480 (0x73) 27.027MHz -HSync -VSync
        h: width   720 start  736 end  798 total  858 skew    0 clock  31.50KHz
        v: height  480 start  489 end  495 total  525           clock  60.00Hz
  720x480 (0x74) 27.000MHz -HSync -VSync
        h: width   720 start  736 end  798 total  858 skew    0 clock  31.47KHz
        v: height  480 start  489 end  495 total  525           clock  59.94Hz
  640x480 (0x75) 31.500MHz -HSync -VSync
        h: width   640 start  656 end  720 total  840 skew    0 clock  37.50KHz
        v: height  480 start  481 end  484 total  500           clock  75.00Hz
  640x480 (0x76) 31.500MHz -HSync -VSync
        h: width   640 start  664 end  704 total  832 skew    0 clock  37.86KHz
        v: height  480 start  489 end  491 total  520           clock  72.81Hz
  640x480 (0x77) 30.240MHz -HSync -VSync
        h: width   640 start  704 end  768 total  864 skew    0 clock  35.00KHz
        v: height  480 start  483 end  486 total  525           clock  66.67Hz
  640x480 (0x78) 25.200MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock  31.50KHz
        v: height  480 start  490 end  492 total  525           clock  60.00Hz
  640x480 (0x79) 25.175MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock  31.47KHz
        v: height  480 start  490 end  492 total  525           clock  59.94Hz
  720x400 (0x7a) 28.320MHz -HSync +VSync
        h: width   720 start  738 end  846 total  900 skew    0 clock  31.47KHz
        v: height  400 start  412 end  414 total  449           clock  70.08Hz

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[Bug 83461] hdmi screen flicker/unusable

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--- Comment #11 from kb@spatium.org ---
Created attachment 154681
  --> https://bugzilla.kernel.org/attachment.cgi?id=154681&action=edit
dmesg with drm.debug=0xe on BAD kernel

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--- Comment #12 from kb@spatium.org ---
note xrandr is on good kernel, dmesg in on bad

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--- Comment #13 from Christian König <deathsimple@vodafone.de> ---
(In reply to kb from comment #12)
> note xrandr is on good kernel, dmesg in on bad

Those outputs should work fine. Going to make a patch for this, but this might
take a while.

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[Bug 83461] hdmi screen flicker/unusable

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--- Comment #14 from Christian König <deathsimple@vodafone.de> ---
Created attachment 155721
  --> https://bugzilla.kernel.org/attachment.cgi?id=155721&action=edit
Add more debugging output.

Please apply the attached patch and provide new dmesg created with
drm.debug=0xE

It should now show a bit more debugging output about your hardware.

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[Bug 83461] hdmi screen flicker/unusable

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--- Comment #15 from kb@spatium.org ---
Created attachment 156061
  --> https://bugzilla.kernel.org/attachment.cgi?id=156061&action=edit
dmesg 2nd run

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[Bug 83461] hdmi screen flicker/unusable

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--- Comment #16 from kb@spatium.org ---
I applied the patch but don't see any of the extra msgs in the dmesg. Maybe
it's because i'm running it on the BAD kernel? Can you make a patch against
3.14 (this one doesn't apply cleanly on 3.14)?

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--- Comment #17 from kb@spatium.org ---
Created attachment 156071
  --> https://bugzilla.kernel.org/attachment.cgi?id=156071&action=edit
dmesg round 2 with correct kernel

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--- Comment #18 from kb@spatium.org ---
OK, false alarm. I had a wrong kernel. Correct output attached.

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[Bug 83461] hdmi screen flicker/unusable

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Christian König <deathsimple@vodafone.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #155721|0                           |1
        is obsolete|                            |

--- Comment #19 from Christian König <deathsimple@vodafone.de> ---
Created attachment 156211
  --> https://bugzilla.kernel.org/attachment.cgi?id=156211&action=edit
Possible fix

Please try the attached patch. It's based on top of Alex drm-fixes-3.18 branch,
but should apply to older ones as well.

The problem seems to be that with a reference frequency of 14.32Mhz and a
reference divider of 14 we get 1.0228Mhz which is very close to the minimum
input frequency of 1Mhz.

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[Bug 83461] hdmi screen flicker/unusable

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--- Comment #20 from kb@spatium.org ---
Hi, unfortunately supplied patch does not fix the issue. Do you need some more
debug output?

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[Bug 83461] hdmi screen flicker/unusable

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--- Comment #21 from Christian König <deathsimple@vodafone.de> ---
(In reply to kb from comment #20)
> Hi, unfortunately supplied patch does not fix the issue. Do you need some
> more debug output?

dmesg output generated with drm.debug=0xE on the kernel command line would be
nice. But I'm running out of idea what else this could be.

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--- Comment #22 from kb@spatium.org ---
I've also added this line
                DRM_DEBUG_KMS("in patched branch: %u\n", ref_div_max);
add the end of your patch, i.e. after 
                ref_div_max = min(ref_div_max, pll->reference_freq / in_min);
just to make sure the new code gets hit.
I see this in dmesg
[   23.002707] [drm:radeon_compute_pll_avivo] in patched branch: 13
and I'm attaching the full output as well. Hope it gives you some more ideas.

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[Bug 83461] hdmi screen flicker/unusable

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--- Comment #23 from kb@spatium.org ---
Created attachment 158001
  --> https://bugzilla.kernel.org/attachment.cgi?id=158001&action=edit
dmesg #3

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[Bug 83461] hdmi screen flicker/unusable

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=83461

--- Comment #24 from kb@spatium.org ---
Any ideas on this? It's really annoying as I need to keep away from upgrading
kernel past 3.14. :(
Do you think change of graphics card would resolve the issue?

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[Bug 83461] hdmi screen flicker/unusable

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=83461

--- Comment #25 from Christian König <deathsimple@vodafone.de> ---
(In reply to kb from comment #24)
> Any ideas on this? It's really annoying as I need to keep away from
> upgrading kernel past 3.14. :(

Unfortunately not, cause I don't have any idea what's causing this.

You could try to artificially limit ref_div_max or fb_div_max until you get a
stable signal once more. Maybe this will yield some more light on the root
cause of the issue.

> Do you think change of graphics card would resolve the issue?

Well, most likely yes.

But the new kernel seems to work better for some people, but has regressed for
you. So I would really like to create a solution that works for everybody.

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[Bug 83461] hdmi screen flicker/unusable

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=83461

--- Comment #26 from kb@spatium.org ---
(In reply to Christian König from comment #25)
> You could try to artificially limit ref_div_max or fb_div_max until you get
> a stable signal once more. Maybe this will yield some more light on the root
> cause of the issue.

Can you give me some details - how to do this?

> > Do you think change of graphics card would resolve the issue?
> 
> Well, most likely yes.
> 
> But the new kernel seems to work better for some people, but has regressed
> for you. So I would really like to create a solution that works for
> everybody.

Right now I switched to catalyst which seems to work and allows me to use new
kernel. But since apparently my card is "legacy" I had to downgrade to xorg
server 1.12 :-|

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[Bug 83461] hdmi screen flicker/unusable

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=83461

--- Comment #27 from Christian König <deathsimple@vodafone.de> ---
Created attachment 159331
  --> https://bugzilla.kernel.org/attachment.cgi?id=159331&action=edit
Testing patch.

(In reply to kb from comment #26)
> (In reply to Christian König from comment #25)
> > You could try to artificially limit ref_div_max or fb_div_max until you get
> > a stable signal once more. Maybe this will yield some more light on the root
> > cause of the issue.
> 
> Can you give me some details - how to do this?

Attached is a testing patch which adds an artificially upper limit to 400.0 for
the feedback divider (normal range 17.0-2048.0) and an upper limit of 13 for
the reference divider (normal range 2-15).

I suggest you start playing with the feedback divider values until you can
figure out the limits for your hardware. E.g. try 400 as in my patch first, if
that works raise it to 800 if that doesn't work go down to 600 again etc..

> 
> > > Do you think change of graphics card would resolve the issue?
> > 
> > Well, most likely yes.
> > 
> > But the new kernel seems to work better for some people, but has regressed
> > for you. So I would really like to create a solution that works for
> > everybody.
> 
> Right now I switched to catalyst which seems to work and allows me to use
> new kernel. But since apparently my card is "legacy" I had to downgrade to
> xorg server 1.12 :-|

Yeah, that's the problem I've got as well. The hardware isn't supported any
more so the whole documentation is not available.

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[Bug 83461] hdmi screen flicker/unusable

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=83461

--- Comment #28 from kb@spatium.org ---
I think your patch has a typo on line 1002 should be ref_div_max not
fb_div_max.

Anyway I played with the numbers and I found a config that works for me. See
below for all the different combos. Right now I'm running with ref_div_max
capped to 2 and going to test it in prolonged use. Any further ideas about
this?

fb/ref => outcome

4000/13 => mode not supported (message on TV screen)
2000/13 => MNS
1000/13 => MNS
500/13 => MNS

4000/1023 => MNS
2000/1023 => MNS
1000/1023 => MNS

20470/1023 => (nominal value without any capping) flicker
10000/1023 => flicker
8000/1023 => different type of flicker, then blank screen
6000/1023 => MNS

20470/13 => flicker
20470/11 => flicker
20470/10 => flicker
20470/9 => very seldom flicker
20470/7 => stable!
20470/2 => stable!

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[Bug 83461] hdmi screen flicker/unusable

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=83461

--- Comment #29 from Markus Gaugusch <markus@gaugusch.at> ---
Hi,
I've also verified that commit 32167016076f714f0e35e287fbead7de0f1fb179 breaks
my system:
01:05.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RS880
[Radeon HD 4250] (prog-if 00 [VGA controller])

The attached patch works fine for me. Without the patch, I can no longer use
the DVI connector of my (onboard) graphics card, only VGA works.

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[Bug 83461] hdmi screen flicker/unusable

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=83461

--- Comment #30 from Markus Gaugusch <markus@gaugusch.at> ---
Additional info: With the (unmodified) patch applied, I get a message
"Nonpreset Mode" displayed on my monitor when I turn it on. So I think the
patch is not 100% correct ...

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[Bug 83461] hdmi screen flicker/unusable

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=83461

--- Comment #31 from kb@spatium.org ---
Christian, do you have any further ideas? Can perhaps the ref_div_max be
settable via sysfs so that I can cap it on boot?

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[Bug 83461] hdmi screen flicker/unusable

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=83461

Christian König <deathsimple@vodafone.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #156211|0                           |1
        is obsolete|                            |
 Attachment #159331|0                           |1
        is obsolete|                            |

--- Comment #32 from Christian König <deathsimple@vodafone.de> ---
Created attachment 163891
  --> https://bugzilla.kernel.org/attachment.cgi?id=163891&action=edit
Possible fix

Unfortunately I don't have any more ideas either. There must be some
undocumented limitation on RS880 and maybe older chips that don't seem to
exists any more on newer ones.

Unfortunately my last RS880 based system blow up about a month ago, so I can't
test this any more.

Please test the attached patch, it just artificial limits the reference divider
to 7 on RS880 and older chips. If that works I'm going to submit the patch
upstream.

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[Bug 83461] hdmi screen flicker/unusable

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=83461

tuxoholic@hotmail.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tuxoholic@hotmail.de

--- Comment #33 from tuxoholic@hotmail.de ---
Hello Christian

It took me a while to regather my bugzilla login info, so I'm not sure whether
you pushed this fix into kernel-git already or still are awaiting feedback,
anyway ... I'm quoting my testing results I wrote in the debian bugtracker
(#770790):

That small patch in attachment #163891 does indeed fix the screen flickering
for me.

I built three versions of radeon.ko against 3.16.7-ckt2 from debian/testing:

1) vanilla version: reproducible flickering, it's even easier to reproduce by
quickly dragging a medium sized window around in circles
2) superseded version: (attachment #159331): no flickering, might contain a
typo on line 1002, but I did not fix that one and it ran flawless for days
3) current version: (#attachment 163891): no flickering

So to sum up: this small fix in #163891 is a blessing, I vote for pushing this
if it hasn't happened already.

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[Bug 83461] hdmi screen flicker/unusable

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=83461

--- Comment #34 from Alex Deucher <alexdeucher@gmail.com> ---
Already upstream:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=72edd83cc9e5819ed1ee771519143d7594e059f0

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[Bug 83461] hdmi screen flicker/unusable

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=83461

Joerg Esser <jackfritt@boh.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jackfritt@boh.de

--- Comment #35 from Joerg Esser <jackfritt@boh.de> ---
I had similar problems until I used 3.18.7.
I couldn´t even boot beyond radeon load. The whole kernel crashed and my
Monitor showed no usable signal. I had to blacklist and load it manually with
option radeon.dpm=0, after turning on my Monitor . With kernel 3.18.6 I could
use the radeon option radeon.aspm=0, but still had to turn on my Monitor before
radeon module load.

Now with this kernel I only need radeon.aspm=0 and no blacklist option, either
the Monitor is turned on before or after radeon module load. Also GPU speedup
with Video output works fine.

Thx alot!!

Here´s my card info

lspci -s 01:00.0 -vv
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cedar
[Radeon HD 5000/6000/7350/8350 Series] (prog-if 00 [VGA controller])
        Subsystem: PC Partner Limited / Sapphire Technology Device e157
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR+ FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 32 bytes
        Interrupt: pin A routed to IRQ 33
        Region 0: Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Region 2: Memory at f7cc0000 (64-bit, non-prefetchable) [size=128K]
        Region 4: I/O ports at d000 [size=256]
        Expansion ROM at f7ca0000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 3
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [58] Express (v2) Legacy Endpoint, MSI 00
                DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <4us, L1
unlimited
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal-
Unsupported-
                        RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
                        MaxPayload 128 bytes, MaxReadReq 512 bytes
                DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr-
TransPend-
                LnkCap: Port #0, Speed 5GT/s, Width x16, ASPM L0s L1, Exit
Latency L0s <64ns, L1 <1us
                        ClockPM- Surprise- LLActRep- BwNot-
                LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 5GT/s, Width x2, TrErr- Train- SlotClk+ DLActive-
BWMgmt- ABWMgmt-
                DevCap2: Completion Timeout: Range ABCD, TimeoutDis+, LTR-,
OBFF Not Supported
                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-,
OBFF Disabled
                LnkCtl2: Target Link Speed: 5GT/s, EnterCompliance- SpeedDis-
                         Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
                         Compliance De-emphasis: -6dB
                LnkSta2: Current De-emphasis Level: -6dB,
EqualizationComplete-, EqualizationPhase1-
                         EqualizationPhase2-, EqualizationPhase3-,
LinkEqualizationRequest-
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
                Address: 00000000fee00000  Data: 40e2
        Capabilities: [100 v1] Vendor Specific Information: ID=0001 Rev=1
Len=010 <?>
        Capabilities: [150 v1] Advanced Error Reporting
                UESta:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt-
RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
                UEMsk:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt-
RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
                UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt-
RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
                CESta:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
                CEMsk:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
                AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
        Kernel driver in use: radeon

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[Bug 83461] hdmi screen flicker/unusable

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=83461

--- Comment #36 from Joerg Esser <jackfritt@boh.de> ---
Oh I forgot, In the kernel changelog it also hits bug 91861.
And it isn´t in 3.19 because there I still have those problem.

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[Bug 83461] hdmi screen flicker/unusable

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=83461

--- Comment #37 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Joerg Esser from comment #35)
> I had similar problems until I used 3.18.7.
> I couldn´t even boot beyond radeon load. The whole kernel crashed and my
> Monitor showed no usable signal. I had to blacklist and load it manually
> with option radeon.dpm=0, after turning on my Monitor . With kernel 3.18.6 I
> could use the radeon option radeon.aspm=0, but still had to turn on my
> Monitor before radeon module load.
> 
> Now with this kernel I only need radeon.aspm=0 and no blacklist option,
> either the Monitor is turned on before or after radeon module load. Also GPU
> speedup with Video output works fine.

Please file a different bug.  This bug and the patch only affect old asics like
the RS880.  Something else must have fixed the issue for you.

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[Bug 83461] hdmi screen flicker/unusable

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=83461

Thom <madeforspam@telfort.nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |madeforspam@telfort.nl

--- Comment #38 from Thom <madeforspam@telfort.nl> ---
I landed here via:
https://bugs.freedesktop.org/show_bug.cgi?id=87682
With the same issue mentioned by user Lockheed and the exact same chip
(RS780M).

Last comment in that post (from Alex Deucher) referred to this bugreport.

On my RS780M I have exactly the same artefacts on my LVDS on any kernel version
higher than 3.13 ( https://www.youtube.com/watch?v=nx2-Fvihzxg )
strangely enough the VGA out is not affected.

Kernels tested up to 4.4.0

Would you like me to add some more info or would you like me to file a separate
bug ?

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