[Bug 32556] New: screen flickers all the time with desktop image appearing only briefly

[Bug 32556] New: screen flickers all the time with desktop image appearing only briefly

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https://bugs.freedesktop.org/show_bug.cgi?id=32556

           Summary: screen flickers all the time with desktop image
                    appearing only briefly
           Product: DRI
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: 3ntr0p13@gmail.com


Created an attachment (id=41344)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=41344)
dmesg

Machine is the same as in bug report 28331 although with different software
components: Acer Aspire L5100 with an AMD Athlon 64 X2 Dual Core Processor
4000+, this time running a 64 bits debian squeeze.

The machine is a small factor desktop machine designed around laptop
components, so the graphic card is an integrated radeon x1200.

When running a linux vanilla kernel 2.6.37-rc6, the screen flickers all the
time
making the machine unusable, while with debian kernel 2.6.32-5  such "flick to
black" event occur from time to time, making it annoying but usable.

While booting with radeon.modeset=0 the problem doesn't exhibits itself

The following packages version from debian squeeze are installed:
xserver-xorg                         1:7.5+8
xserver-xorg-core                    2:1.7.7-10
xserver-xorg-video-radeon            1:6.13.1-2+squeeze1

Please find attached Xorg.0.log, dmesg, register dumps for ums and kms for that
machine (when booted on 2.6.37-rc6).

Regards,
Gildas

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--- Comment #1 from Gildas Le Nadan <3ntr0p13@gmail.com> 2010-12-21 09:33:47 PST ---
Created an attachment (id=41345)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=41345)
Xorg.log

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[Bug 32556] screen flickers all the time with desktop image appearing only briefly

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--- Comment #2 from Gildas Le Nadan <3ntr0p13@gmail.com> 2010-12-21 09:34:35 PST ---
Created an attachment (id=41346)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=41346)
UMS register dump as per #28331

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[Bug 32556] screen flickers all the time with desktop image appearing only briefly

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--- Comment #3 from Gildas Le Nadan <3ntr0p13@gmail.com> 2010-12-21 09:35:21 PST ---
Created an attachment (id=41347)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=41347)
KMS register dump as per #28331

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--- Comment #4 from Gildas Le Nadan <3ntr0p13@gmail.com> 2010-12-21 09:38:37 PST ---
Created an attachment (id=41348)
 View: https://bugs.freedesktop.org/attachment.cgi?id=41348
 Review: https://bugs.freedesktop.org/review?bug=32556&attachment=41348

patch proposed by Alex Deucher

This patch, proposed by Alex on irc, applied with a drift of 20 lines or so did
NOT fix the problem.

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[Bug 32556] screen flickers all the time with desktop image appearing only briefly

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Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #41344|application/octet-stream    |text/plain
          mime type|                            |
  Attachment #41344|0                           |1
           is patch|                            |

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--- Comment #5 from Alex Deucher <agd5f@yahoo.com> 2010-12-21 10:51:07 PST ---
How about this?

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c
b/drivers/gpu/drm/radeon/atombios_crtc.c
index b0ab185..fa92120 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -521,12 +521,6 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
        pll->flags = 0;

        if (ASIC_IS_AVIVO(rdev)) {
-               if ((rdev->family == CHIP_RS600) ||
-                   (rdev->family == CHIP_RS690) ||
-                   (rdev->family == CHIP_RS740))
-                       pll->flags |= (/*RADEON_PLL_USE_FRAC_FB_DIV |*/
-                                      RADEON_PLL_PREFER_CLOSEST_LOWER);
-
                if (ASIC_IS_DCE32(rdev) && mode->clock > 200000)        /*
range limits??? */
                        pll->flags |= RADEON_PLL_PREFER_HIGH_FB_DIV;
                else

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--- Comment #6 from Gildas Le Nadan <3ntr0p13@gmail.com> 2010-12-21 11:37:15 PST ---
(In reply to comment #5)
> How about this?
> 
> diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c
> b/drivers/gpu/drm/radeon/atombios_crtc.c
> index b0ab185..fa92120 100644
> --- a/drivers/gpu/drm/radeon/atombios_crtc.c
> +++ b/drivers/gpu/drm/radeon/atombios_crtc.c
> @@ -521,12 +521,6 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
>         pll->flags = 0;
> 
>         if (ASIC_IS_AVIVO(rdev)) {
> -               if ((rdev->family == CHIP_RS600) ||
> -                   (rdev->family == CHIP_RS690) ||
> -                   (rdev->family == CHIP_RS740))
> -                       pll->flags |= (/*RADEON_PLL_USE_FRAC_FB_DIV |*/
> -                                      RADEON_PLL_PREFER_CLOSEST_LOWER);
> -
>                 if (ASIC_IS_DCE32(rdev) && mode->clock > 200000)        /*
> range limits??? */
>                         pll->flags |= RADEON_PLL_PREFER_HIGH_FB_DIV;
>                 else

No problem is still there. See register dump kms2.regs

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--- Comment #7 from Gildas Le Nadan <3ntr0p13@gmail.com> 2010-12-21 11:37:51 PST ---
Created an attachment (id=41351)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=41351)
after proposed patch #2 was applied

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Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #41346|application/octet-stream    |text/plain
          mime type|                            |
  Attachment #41346|0                           |1
           is patch|                            |

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Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #41347|application/octet-stream    |text/plain
          mime type|                            |
  Attachment #41347|0                           |1
           is patch|                            |

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Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #41351|application/octet-stream    |text/plain
          mime type|                            |
  Attachment #41351|0                           |1
           is patch|                            |

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--- Comment #8 from Alex Deucher <agd5f@yahoo.com> 2010-12-22 11:26:01 PST ---
Created an attachment (id=41376)
 View: https://bugs.freedesktop.org/attachment.cgi?id=41376
 Review: https://bugs.freedesktop.org/review?bug=32556&attachment=41376

add new pll flag

This patch adds a new pll flag to prefer slightly higher frequencies if the
target clock cannot be hit exactly.

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--- Comment #9 from Alex Deucher <agd5f@yahoo.com> 2010-12-22 11:28:24 PST ---
With the patch from comment 8, try these possible fixes:

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c
b/drivers/gpu/drm/radeon/atombios_crtc.c
index b0ab185..0be8015 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -525,7 +525,7 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
                    (rdev->family == CHIP_RS690) ||
                    (rdev->family == CHIP_RS740))
                        pll->flags |= (/*RADEON_PLL_USE_FRAC_FB_DIV |*/
-                                      RADEON_PLL_PREFER_CLOSEST_LOWER);
+                                      RADEON_PLL_PREFER_CLOSEST_HIGHER);

                if (ASIC_IS_DCE32(rdev) && mode->clock > 200000)        /*
range limits??? */
                        pll->flags |= RADEON_PLL_PREFER_HIGH_FB_DIV;

Or:

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c
b/drivers/gpu/drm/radeon/atombios_crtc.c
index b0ab185..91facc8 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -525,7 +525,7 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
                    (rdev->family == CHIP_RS690) ||
                    (rdev->family == CHIP_RS740))
                        pll->flags |= (/*RADEON_PLL_USE_FRAC_FB_DIV |*/
-                                      RADEON_PLL_PREFER_CLOSEST_LOWER);
+                                      RADEON_PLL_NO_ODD_POST_DIV);

                if (ASIC_IS_DCE32(rdev) && mode->clock > 200000)        /*
range limits??? */
                        pll->flags |= RADEON_PLL_PREFER_HIGH_FB_DIV;

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--- Comment #10 from Gildas Le Nadan <3ntr0p13@gmail.com> 2010-12-22 13:45:40 PST ---
Created an attachment (id=41379)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=41379)
patch+RADEON_PLL_PREFER_CLOSEST_HIGHER

registers for kms with new pll patch applied + RADEON_PLL_PREFER_CLOSEST_HIGHER

Screen flickers slightly less than previously but is still unusable

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--- Comment #11 from Gildas Le Nadan <3ntr0p13@gmail.com> 2010-12-22 13:47:35 PST ---
Created an attachment (id=41380)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=41380)
patch + RADEON_PLL_NO_ODD_POST_DIV

registers for kms with new pll patch applied + RADEON_PLL_NO_ODD_POST_DIV

Screen flickers slightly less than without patch but is still unusable

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--- Comment #12 from Gildas Le Nadan <3ntr0p13@gmail.com> 2010-12-22 13:48:56 PST ---
(In reply to comment #9)
> With the patch from comment 8, try these possible fixes:
> 
> diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c
> b/drivers/gpu/drm/radeon/atombios_crtc.c
> index b0ab185..0be8015 100644
> --- a/drivers/gpu/drm/radeon/atombios_crtc.c
> +++ b/drivers/gpu/drm/radeon/atombios_crtc.c
> @@ -525,7 +525,7 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
>                     (rdev->family == CHIP_RS690) ||
>                     (rdev->family == CHIP_RS740))
>                         pll->flags |= (/*RADEON_PLL_USE_FRAC_FB_DIV |*/
> -                                      RADEON_PLL_PREFER_CLOSEST_LOWER);
> +                                      RADEON_PLL_PREFER_CLOSEST_HIGHER);
> 
>                 if (ASIC_IS_DCE32(rdev) && mode->clock > 200000)        /*
> range limits??? */
>                         pll->flags |= RADEON_PLL_PREFER_HIGH_FB_DIV;
> 
> Or:
> 
> diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c
> b/drivers/gpu/drm/radeon/atombios_crtc.c
> index b0ab185..91facc8 100644
> --- a/drivers/gpu/drm/radeon/atombios_crtc.c
> +++ b/drivers/gpu/drm/radeon/atombios_crtc.c
> @@ -525,7 +525,7 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
>                     (rdev->family == CHIP_RS690) ||
>                     (rdev->family == CHIP_RS740))
>                         pll->flags |= (/*RADEON_PLL_USE_FRAC_FB_DIV |*/
> -                                      RADEON_PLL_PREFER_CLOSEST_LOWER);
> +                                      RADEON_PLL_NO_ODD_POST_DIV);
> 
>                 if (ASIC_IS_DCE32(rdev) && mode->clock > 200000)        /*
> range limits??? */
>                         pll->flags |= RADEON_PLL_PREFER_HIGH_FB_DIV;

None of the proposed solutions fix the problem for good although there is some
improvement over the flickering frequency.

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--- Comment #13 from Alex Deucher <agd5f@yahoo.com> 2010-12-23 10:49:28 PST ---
How about:

pll->flags |= (RADEON_PLL_USE_FRAC_FB_DIV | RADEON_PLL_PREFER_CLOSEST_HIGHER);

Can you also attach a copy of your vbios?
(as root)
(use lspci to get the bus id)
cd /sys/bus/pci/devices/<pci bus id>
echo 1 > rom
cat rom > /tmp/vbios.rom
echo 0 > rom

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--- Comment #14 from Alex Deucher <agd5f@yahoo.com> 2010-12-23 11:07:39 PST ---
Also try:

pll->flags |= (RADEON_PLL_USE_FRAC_FB_DIV |
               RADEON_PLL_PREFER_CLOSEST_HIGHER |
               RADEON_PLL_NO_ODD_POST_DIV);

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--- Comment #15 from Gildas Le Nadan <3ntr0p13@gmail.com> 2010-12-23 23:29:12 PST ---
Created an attachment (id=41406)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=41406)
vbios.rom

Here for Xmas, have a poodle vbios

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--- Comment #16 from Gildas Le Nadan <3ntr0p13@gmail.com> 2010-12-23 23:50:31 PST ---
(In reply to comment #13)
> How about:
> 
> pll->flags |= (RADEON_PLL_USE_FRAC_FB_DIV | RADEON_PLL_PREFER_CLOSEST_HIGHER);
> 
> Can you also attach a copy of your vbios?
> (as root)
> (use lspci to get the bus id)
> cd /sys/bus/pci/devices/<pci bus id>
> echo 1 > rom
> cat rom > /tmp/vbios.rom
> echo 0 > rom

With this one screen is completely unusable (similar to the initial situation).
Will attach kms_frac_closest.regs

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--- Comment #17 from Gildas Le Nadan <3ntr0p13@gmail.com> 2010-12-23 23:51:50 PST ---
Created an attachment (id=41407)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=41407)
registers with KMS patch and RADEON_PLL_USE_FRAC_FB_DIV |
RADEON_PLL_PREFER_CLOSEST_HIGHER

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--- Comment #18 from Gildas Le Nadan <3ntr0p13@gmail.com> 2010-12-24 00:10:58 PST ---
(In reply to comment #14)
> Also try:
> 
> pll->flags |= (RADEON_PLL_USE_FRAC_FB_DIV |
>                RADEON_PLL_PREFER_CLOSEST_HIGHER |
>                RADEON_PLL_NO_ODD_POST_DIV);

No image at all with this one. See kms_frac_closest_odd.regs

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--- Comment #19 from Gildas Le Nadan <3ntr0p13@gmail.com> 2010-12-24 00:11:54 PST ---
Created an attachment (id=41408)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=41408)
registers with KMS patch and RADEON_PLL_USE_FRAC_FB_DIV |
RADEON_PLL_PREFER_CLOSEST_HIGHER |RADEON_PLL_NO_ODD_POST_DIV

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--- Comment #20 from Alex Deucher <agd5f@yahoo.com> 2010-12-24 10:42:16 PST ---
Created an attachment (id=41430)
 View: https://bugs.freedesktop.org/attachment.cgi?id=41430
 Review: https://bugs.freedesktop.org/review?bug=32556&attachment=41430

adjust up the clock slightly on rs6xx TDMS

Does this patch help?

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--- Comment #21 from Gildas Le Nadan <3ntr0p13@gmail.com> 2011-01-08 15:34:32 PST ---
(In reply to comment #20)
> Created an attachment (id=41430)
 View: https://bugs.freedesktop.org/attachment.cgi?id=41430
 Review: https://bugs.freedesktop.org/review?bug=32556&attachment=41430

> adjust up the clock slightly on rs6xx TDMS
> 
> Does this patch help?

This patch seems to help when combined with "RADEON_PLL_USE_FRAC_FB_DIV |
RADEON_PLL_PREFER_CLOSEST_HIGHER |RADEON_PLL_NO_ODD_POST_DIV".

For now after a single session of 2h, it even seems more stable than ums (where
occasional losses of images happen maybe every 20-30mins on average).

I've tried other combinations as well with various success:

- RADEON_PLL_PREFER_CLOSEST_LOWER => unstable-ish
- RADEON_PLL_USE_FRAC_FB_DIV => black
- RADEON_PLL_PREFER_CLOSEST_LOWER | RADEON_PLL_USE_FRAC_FB_DIV => not very
stable
- RADEON_PLL_PREFER_CLOSEST_HIGHER => not stable
- RADEON_PLL_USE_FRAC_FB_DIV | RADEON_PLL_PREFER_CLOSEST_HIGHER => not stable

I can provide the registers for the different tests if that could be of any
uses.

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--- Comment #22 from Alex Deucher <agd5f@yahoo.com> 2011-01-09 00:30:46 PST ---
You might also try making slight changes to the clock adjustment:
adjusted_clock += 50;
e.g., try 40, 45, 55, 60, 65, etc.

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--- Comment #23 from Gildas Le Nadan <3ntr0p13@gmail.com> 2011-01-10 01:51:20 PST ---
(In reply to comment #22)
> You might also try making slight changes to the clock adjustment:
> adjusted_clock += 50;
> e.g., try 40, 45, 55, 60, 65, etc.

As far as I can tell the problem seems to be solved with adjusted_clock += 50;
and RADEON_PLL_USE_FRAC_FB_DIV | RADEON_PLL_PREFER_CLOSEST_HIGHER
|RADEON_PLL_NO_ODD_POST_DIV.

After 3 hours of use (including watching video), 1 reboot and 1 cold boot, the
screen never flicked, which not only means the bug concerned by this bug report
is fixed, but apparently there is even an improvement over the previous
situation.

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[Bug 32556] screen flickers all the time with desktop image appearing only briefly

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https://bugs.freedesktop.org/show_bug.cgi?id=32556

--- Comment #24 from Alex Deucher <agd5f@yahoo.com> 2011-01-10 09:25:45 PST ---
Created an attachment (id=41852)
 View: https://bugs.freedesktop.org/attachment.cgi?id=41852
 Review: https://bugs.freedesktop.org/review?bug=32556&attachment=41852

ppll stability fixes for rs690

I've sent this patch and the one from attachment 41376 to Dave.

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Alex Deucher <agd5f@yahoo.com> changed:

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

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Alex Deucher <agd5f@yahoo.com> changed:

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

--- Comment #25 from Alex Deucher <agd5f@yahoo.com> 2011-01-10 13:11:33 PST ---
re-opening as there are still some issues as we discussed on IRC.

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--- Comment #26 from Gildas Le Nadan <3ntr0p13@gmail.com> 2011-01-10 13:14:17 PST ---
(In reply to comment #25)
> re-opening as there are still some issues as we discussed on IRC.

After our discussion on IRC caused by the fact your patch was slightly
different than what I've tested, I've done the following tests:

1) DVI LCD screen VIEWSONIC 1680x1050 with DVI-DVI
Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 8192 x 8192
DVI-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 474mm
x 296mm
   1680x1050      60.0 +
   1400x1050      60.0  
   1280x1024      75.0    60.0  
   1440x900       59.9  
   1280x960       60.0  
   1152x864       75.0  
   1024x768       75.1     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3     56.2  
   640x480        72.8     75.0     66.7     60.0  
   720x400        70.1  
   640x400        70.0 

OK   1680x1050 1280x1024 832x624 800x600 720x400
unstable   1400x1050 640x480 640x400
KO    1440x900 1280x960 1152x864 1024x768

2) LCD screen IIYAMA 1920x1200  with HDMI connector on HDMI
Screen 0: minimum 320 x 200, current 640 x 480, maximum 8192 x 8192
DVI-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected 640x480+0+0 (normal left inverted right x axis y axis) 519mm x
324mm
   1920x1200      60.0 +
   1680x1050      60.0 +
   1600x1200      60.0  
   1280x1024      76.0     75.0     72.0     60.0  
   1440x900       75.0     59.9  
   1152x864       75.0  
   1280x720       60.0  
   1024x768       75.1     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3  
   640x480        72.8     75.0     66.7     60.0  
   720x400        70.1  

KO except below 832x624. With 800x600, the image contain noise (flickering
horizontal color lines).

/!\ when connecting the VIEWSONIC with a HDMI-DVI cable, results are similar,
i-e no image except below 832x624.

3) ANALOG screen SILICON GRAPHICS connected on DVI with VGA adapter 
DVI-0 connected 1024x768+0+0 (normal left inverted right x axis y axis) 350mm x
280mm
   1280x1024      75.0  
   1024x768       75.1

OK for both resolutions

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--- Comment #27 from Daniel <freedesktop@hulapla.de> 2011-01-12 07:14:30 PST ---
I have a "flicker" problem, too. While option radeon.new_pll=0 fixes the
problem at kernel 2.6.35 and 2.6.36, now with 2.6.37 this option is gone. 

But my computer NOT starts directly flickering after kernel modesetting is
initialized. It starts after performing some cpu usage like compiling. First
there are many white lines flickering at the screen, then the screen going
black.

Flickering Video: http://youtu.be/oKsQ4Ga1pKA

I have IBM Thinkpad T60 / Gentoo Linux
with ATI Technologies Inc Radeon Mobility X1400

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--- Comment #28 from Alex Deucher <agd5f@yahoo.com> 2011-01-12 08:51:01 PST ---
(In reply to comment #27)
> I have a "flicker" problem, too. While option radeon.new_pll=0 fixes the
> problem at kernel 2.6.35 and 2.6.36, now with 2.6.37 this option is gone. 

new_pll=0 became the default.

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--- Comment #29 from Daniel <freedesktop@hulapla.de> 2011-01-12 10:22:38 PST ---
Okay, but without new_pll=0 in 2.6.35/36 i had the completely identical error.

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--- Comment #30 from Alex Deucher <agd5f@yahoo.com> 2011-01-12 17:01:16 PST ---
Created an attachment (id=41943)
 View: https://bugs.freedesktop.org/attachment.cgi?id=41943
 Review: https://bugs.freedesktop.org/review?bug=32556&attachment=41943

possible fix

Does this patch fix the issues?

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[Bug 32556] [RADEON:KMS:PLL] screen flickers all the time with desktop image appearing only briefly

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Jerome Glisse <glisse@freedesktop.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|screen flickers all the     |[RADEON:KMS:PLL] screen
                   |time with desktop image     |flickers all the time with
                   |appearing only briefly      |desktop image appearing
                   |                            |only briefly

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--- Comment #31 from Gildas Le Nadan <3ntr0p13@gmail.com> 2011-08-05 08:59:00 PDT ---
Hi, I've compiled kernel 3.0 and apparently things are way better now.

Connection on the viewsonic using dvi seem to be stable for all definitions.
I'll confirm after a few days using 1680x1050.

Vga connection to the analog SGI screen seem OK too.

On the Iiyama 24" with the HDMI attachment, I have noted the "turn black 3 secs
and display image again" syndrom is still there though (I'd say once every 5-!0
mn on average).

Gildas

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https://bugs.freedesktop.org/show_bug.cgi?id=32556

Martin Peres <martin.peres@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |MOVED

--- Comment #32 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
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You can subscribe and participate further through the new bug through this link
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