* [Bug 16541] Imac Radeon HD 4850 switch "Mini Display Port" output with ALL kernels after 2.6.31
[not found] <bug-16541-2300@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=16541
Andrew Morton <akpm@linux-foundation.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |akpm@linux-foundation.org
Component|i386 |Video(DRI - non Intel)
AssignedTo|platform_i386@kernel-bugs.o |drivers_video-dri@kernel-bu
|sdl.org |gs.osdl.org
Product|Platform Specific/Hardware |Drivers
--- Comment #1 from Andrew Morton <akpm@linux-foundation.org> 2010-08-26 22:04:43 ---
So.. I guess we're talking about drivers/gpu/drm/radeon/ here?
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* [Bug 16541] Imac Radeon HD 4850 switch "Mini Display Port" output with ALL kernels after 2.6.31
[not found] <bug-16541-2300@https.bugzilla.kernel.org/>
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From: bugzilla-daemon @ 2010-08-26 23:56 UTC (permalink / raw)
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https://bugzilla.kernel.org/show_bug.cgi?id=16541
Alex Deucher <alexdeucher@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |alexdeucher@gmail.com
--- Comment #2 from Alex Deucher <alexdeucher@gmail.com> 2010-08-26 23:56:06 ---
The DP link training algorithm needs to be adjusted as it's not able to train
the link with the 2560x1440 panel used in the imac.
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* [Bug 16541] Imac Radeon HD 4850 switch "Mini Display Port" output with ALL kernels after 2.6.31
[not found] <bug-16541-2300@https.bugzilla.kernel.org/>
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From: bugzilla-daemon @ 2010-08-27 13:44 UTC (permalink / raw)
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https://bugzilla.kernel.org/show_bug.cgi?id=16541
--- Comment #3 from jeff.artik@gmail.com 2010-08-27 13:44:38 ---
But if you test ubuntu Karmic, installation works. It's since Lucid (so the
news kernel). THere is a big topic here :
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/542660
and
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/542660/comments/27
The issue is here since new kernels, since Lucid olds one works. It's actually
impossible to install LUCID on an Imac27, and I don't think resolution is the
issue, black screen comes just after the start instalation, before getting
"steps" installations in ubuntu. This bug hits all releases using new kernel,
impossible to install anything (tried suze, debian, ubuntu ...) It's a real
nightmare.
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* [Bug 16541] Imac Radeon HD 4850 switch "Mini Display Port" output with ALL kernels after 2.6.31
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--- Comment #4 from jeff.artik@gmail.com 2010-08-27 13:45:41 ---
But why eveything works fine with old kernels and Imac ? it's definitly a new
bug, that can be corrected
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* [Bug 16541] Imac Radeon HD 4850 switch "Mini Display Port" output with ALL kernels after 2.6.31
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--- Comment #5 from Alex Deucher <alexdeucher@gmail.com> 2010-08-27 17:41:45 ---
It only "worked" before because the driver did not have support for embedded
DisplayPort (eDP), so it didn't touch the eDP registers and as such the panel
was left as configured by the firmware.
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--- Comment #6 from jeff.artik@gmail.com 2010-08-27 17:44:59 ---
Ok Alex, I understand, but do you think that can be corrected ? Can't imagine
linux never won't work on Imac27 :S
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--- Comment #7 from Alex Deucher <alexdeucher@gmail.com> 2010-08-27 17:54:43 ---
Someone with one of the problematic panels needs to tweak the link training
code until they get the monitor and the gpu to agree. The link training
sequence is in dp_link_train() in atombios_dp.c in the kernel if you want to
play with it. I'd suggest playing with the delays to start with.
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--- Comment #8 from jeff.artik@gmail.com 2010-09-07 23:49:58 ---
I never will get these knowledges to tweak something :'(
It seems issue hit many people with ATI cards, still don't understand why this
bug is not seriously taken, and nothing has been fixed yet, even it's a
regression.
nightmare continue, I just want to kill ATI !!!! why Apple choose them !
https://bugs.launchpad.net/ubuntu/lucid/+source/linux/+bug/542660
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--- Comment #9 from jeff.artik@gmail.com 2010-09-07 23:51:58 ---
http://www.mail-archive.com/dri-devel@lists.sourceforge.net/msg44917.html this
patch could help ?
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--- Comment #10 from jeff.artik@gmail.com 2010-09-08 00:27:14 ---
Lol Alex sorry, I saw that is you patch, and it seems it is applied in the last
kernel, but nothing new. Cold you tell me what do you mean by "playing " ? what
king of settings I can change to try some tests ?
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From: bugzilla-daemon @ 2011-05-11 1:19 UTC (permalink / raw)
To: dri-devel
https://bugzilla.kernel.org/show_bug.cgi?id=16541
Jérémy Lal <kapouer@melix.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |kapouer@melix.org
--- Comment #11 from Jérémy Lal <kapouer@melix.org> 2011-05-11 01:19:47 ---
I think this has become a duplicate of
https://bugs.freedesktop.org/show_bug.cgi?id=27314
and Jeff, cheers up, i'm writing this from an iMac 27 (model 12,2), only i have
to boot my linux partition from cd to enable bios instead of efi, then kms
works.
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--- Comment #12 from jeff.artik@gmail.com 2011-05-11 13:06:16 ---
Hi Jérémy ! So happy to see people triying to help me ! Could you tell me how
to proceed ? (step by step :P) hope that will help me ;)
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From: bugzilla-daemon @ 2012-08-09 15:42 UTC (permalink / raw)
To: dri-devel
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Alan <alan@lxorguk.ukuu.org.uk> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |alan@lxorguk.ukuu.org.uk
Resolution| |OBSOLETE
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