[Bug 25741] [R600/KMS] external display flickering

[Bug 25741] [R600/KMS] external display flickering

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=25741





--- Comment #14 from Luca Tettamanti <kronos.it@gmail.com>  2010-01-07 09:00:06 PST ---
Created an attachment (id=32509)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=32509)
Add a module parameter to disable spread spectrum unconditionally

In case this turns out to be a bug in my card bios or a hardware problem; it's
really a show-stopper for me.


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[Bug 25741] [R600/KMS] external display flickering

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=25741


Philipp Claves <pclaves@web.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pclaves@web.de




--- Comment #15 from Philipp Claves <pclaves@web.de>  2010-03-06 07:56:45 PST ---
I have the same VGA ripple effect.

01:00.0 VGA compatible controller: ATI Technologies Inc M76 [Radeon Mobility HD
2600 Series]

agd5f on IRC suggested to try 'avivotool regset 0x458 0x00000000' or 'avivotool
regset 0x45c 0x00000000'. The first command fixes it (didn't try the second
one).

avivotool is a part of radeontool and can be found here:
http://cgit.freedesktop.org/~airlied/radeontool


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[Bug 25741] [R600/KMS] external display flickering

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=25741





--- Comment #16 from Philipp Claves <pclaves@web.de>  2010-03-06 07:58:07 PST ---
Created an attachment (id=33815)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=33815)
dmesg with 2.6.33 KMS enabled


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[Bug 25741] [R600/KMS] external display flickering

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=25741





--- Comment #17 from Philipp Claves <pclaves@web.de>  2010-03-06 07:59:25 PST ---
Created an attachment (id=33816)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=33816)
Xorg log with Kernel 2.6.33 KMS


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[Bug 25741] [R600/KMS] external display flickering

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=25741





--- Comment #18 from Alex Deucher <agd5f@yahoo.com>  2010-03-06 08:06:50 PST ---
Created an attachment (id=33817)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=33817)
possible fix

Does this patch help?


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[Bug 25741] [R600/KMS] external display flickering

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=25741





--- Comment #19 from Luca Tettamanti <kronos.it@gmail.com>  2010-03-08 05:00:29 PST ---
(In reply to comment #18)
> Created an attachment (id=33817)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=33817) [details]
> possible fix
> 
> Does this patch help?

No. However fiddling with avivotool as suggested by Philipp fixes the issue.
>From the output of the tool it seems that the kernel driver is setting the
wrong (PLL id swapped?) register:

#. /avivotool regset 0x458 0x00000000
OLD: 0x458 (0458)       0x2a020101 (704774401)
NEW: 0x458 (0458)       0x00000000 (0)

# ./avivotool regset 0x45c 0x00000000
OLD: 0x45c (045c)       0x00000000 (0)
NEW: 0x45c (045c)       0x00000000 (0)

Setting 0x458 (AVIVO_P1PLL_INT_SS_CNTL) stops the flickering on the external
VGA monitor.


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[Bug 25741] [R600/KMS] external display flickering

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=25741





--- Comment #20 from Alex Deucher <agd5f@yahoo.com>  2010-03-08 10:30:34 PST ---
(In reply to comment #19)
> (In reply to comment #18)
> > Created an attachment (id=33817)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=33817) [details] [details]
> > possible fix
> > 
> > Does this patch help?
> 
> No. However fiddling with avivotool as suggested by Philipp fixes the issue.
> From the output of the tool it seems that the kernel driver is setting the
> wrong (PLL id swapped?) register:
> 
> #. /avivotool regset 0x458 0x00000000
> OLD: 0x458 (0458)       0x2a020101 (704774401)
> NEW: 0x458 (0458)       0x00000000 (0)
> 
> # ./avivotool regset 0x45c 0x00000000
> OLD: 0x45c (045c)       0x00000000 (0)
> NEW: 0x45c (045c)       0x00000000 (0)
> 
> Setting 0x458 (AVIVO_P1PLL_INT_SS_CNTL) stops the flickering on the external
> VGA monitor.
> 

Do things work properly if you boot without the VGA monitor attached and then
connect and enable it later?


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[Bug 25741] [R600/KMS] external display flickering

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=25741





--- Comment #21 from Philipp Claves <pclaves@web.de>  2010-03-08 10:43:02 PST ---
(In reply to comment #20)
> Do things work properly if you boot without the VGA monitor attached and then
> connect and enable it later?
> 

Yes, this works for me.

Maybe this is related: When booting with UMS and VGA connected, the LVDS Panel
is the first Monitor and VGA the second. With KMS it is the other way round.


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[Bug 25741] [R600/KMS] external display flickering

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=25741





--- Comment #22 from Alex Deucher <agd5f@yahoo.com>  2010-03-08 14:17:04 PST ---
Created an attachment (id=33870)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=33870)
fix spread spectrum

This should do the trick.  Please apply this on top of the previous patch.


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[Bug 25741] [R600/KMS] external display flickering

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=25741





--- Comment #23 from Luca Tettamanti <kronos.it@gmail.com>  2010-03-09 01:50:32 PST ---
(In reply to comment #22)
> Created an attachment (id=33870)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=33870) [details]
> fix spread spectrum
> 
> This should do the trick.  Please apply this on top of the previous patch.

Works for me, thanks!


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[Bug 25741] [R600/KMS] external display flickering

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=25741


Alex Deucher <agd5f@yahoo.com> changed:

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




--- Comment #24 from Alex Deucher <agd5f@yahoo.com>  2010-03-09 06:16:16 PST ---
Patch sent to Dave.


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[Bug 25741] [R600/KMS] external display flickering

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=25741


Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bryce@canonical.com




--- Comment #25 from Alex Deucher <agd5f@yahoo.com>  2010-03-23 18:45:50 PST ---
*** Bug 27278 has been marked as a duplicate of this bug. ***


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