[Bug 21542] New: Radeon: No 50Hz modes available after upgrading to 2.6.36

[Bug 21542] New: Radeon: No 50Hz modes available after upgrading to 2.6.36

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=21542

           Summary: Radeon: No 50Hz modes available after upgrading to
                    2.6.36
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.36
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: ville.aakko@gmail.com
        Regression: No


Hi!

I live in Europe/Finland and have an HTPC setup using Radeon IGP (Gigabyte
GA-MA78GM-S2H; i.e. R600 based or actually RS780 or somesuch... the Radeon
naming scheme is confusing to me). With Kernel 2.6.35 everything is fine. But
after upgrading to 2.6.36, all the 50Hz modes are NTSC-entrically gone! I can't
set to 50Hz via 'xrandr -r 50' anymore, and also xrandr only lists 60Hz modes.
Does anyone know how can those modes be brought back? Or perhaps fix it at some
point =)

I'm on Gentoo and will happily provide more information if needed.

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[Bug 21542] Radeon: No 50Hz (PAL) modes available after upgrading to 2.6.36

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=21542


Ville Aakko <ville.aakko@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Radeon: No 50Hz modes       |Radeon: No 50Hz (PAL) modes
                   |available after upgrading   |available after upgrading
                   |to 2.6.36                   |to 2.6.36




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[Bug 21542] Radeon: No 50Hz (PAL) modes available after upgrading to 2.6.36

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=21542


Alex Deucher <alexdeucher@gmail.com> changed:

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




--- Comment #1 from Alex Deucher <alexdeucher@gmail.com>  2010-10-31 17:27:30 ---
The mode fetching is part of the core drm.  So it's likely some change there
that caused the problem.  Can you bisect?  Also please attach your dmesg output
and xorg log.

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[Bug 21542] Radeon: No 50Hz (PAL) modes available after upgrading to 2.6.36

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=21542





--- Comment #2 from Ville Aakko <ville.aakko@gmail.com>  2010-10-31 20:35:24 ---
Sure, I'll do the bisect!

But I won't probably have time to start the bisecting until next weekend, so if
someone is reading and is interested in bisecting, go ahead if you have time
before I do ;-).

I'll attach the logs, however (the ones for 2.6.35 are good; I noticed that
while running 2.6.36 there's no EDID information in Xorg.0.log).

Sorry if the following doesn't belong here, but I'm a bit new to git and
bisecting (done so for wine once or twice...) Is there a better way for doing
this than:
# git clone
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
# git bisect start
# git bisect bad
# git bisect good v2.6.35

... and then compiling and installing, and rebooting every commit? For example,
is it possible to just fetch the DRM part of the tree (or perhaps just the
radeon module if I can pinpoint the cause), install the modules from it to the
currently running kernel (after testing I can reproduce the but that way)? That
would reduce compiling time and reduce reboots.

Also, the last good one I used in gentoo was 2.6.35-r10 which should compare to
kernel-2.6.35-11 AFAICT, but I found no easy way to mark that one good in
git-bisect to test.

Cheers!
 - Ville

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[Bug 21542] Radeon: No 50Hz (PAL) modes available after upgrading to 2.6.36

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https://bugzilla.kernel.org/show_bug.cgi?id=21542





--- Comment #3 from Ville Aakko <ville.aakko@gmail.com>  2010-10-31 20:37:12 ---
Created an attachment (id=35612)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=35612)
Kernel 2.6.35-r10 log, the last known good

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[Bug 21542] Radeon: No 50Hz (PAL) modes available after upgrading to 2.6.36

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https://bugzilla.kernel.org/show_bug.cgi?id=21542





--- Comment #4 from Ville Aakko <ville.aakko@gmail.com>  2010-10-31 20:38:03 ---
Created an attachment (id=35622)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=35622)
Kernel 2.6.36 dmesg, where the 50Hz are not available...

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[Bug 21542] Radeon: No 50Hz (PAL) modes available after upgrading to 2.6.36

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=21542


Ville Aakko <ville.aakko@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #35612|Kernel 2.6.35-r10 log, the  |Kernel 2.6.35-r10 dmesg,
        description|last known good             |the last known good




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[Bug 21542] Radeon: No 50Hz (PAL) modes available after upgrading to 2.6.36

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https://bugzilla.kernel.org/show_bug.cgi?id=21542





--- Comment #5 from Ville Aakko <ville.aakko@gmail.com>  2010-10-31 20:39:03 ---
Created an attachment (id=35632)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=35632)
Xorg log while running 2.6.35, and 50Hz modes are working

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[Bug 21542] Radeon: No 50Hz (PAL) modes available after upgrading to 2.6.36

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=21542





--- Comment #6 from Ville Aakko <ville.aakko@gmail.com>  2010-10-31 20:39:38 ---
Created an attachment (id=35642)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=35642)
Xorg log while running 2.6.36, no 50Hz modes available

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[Bug 21542] Radeon: No 50Hz (PAL) modes available after upgrading to 2.6.36

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=21542





--- Comment #7 from Ville Aakko <ville.aakko@gmail.com>  2010-10-31 20:44:17 ---
Hmm., 

I noticed that also in dmesg there's some error about EDID, that is not there
in 2.6.35-r10.

Also, I forgot to mention that I'm running installing the kernel via
gentoo-sources ebuild, which has a Gentoo patchset... hope it is not the cause
and I was not too fast in judging this an upstream issue. If that seems the
case (I should be able to install a vanilla kernel quite easily once I find the
time) I'll report here (so we can close this bug as invalid, but let's not do
that yet since it is fairly easy to find out).

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[Bug 21542] Radeon: No 50Hz (PAL) modes available after upgrading to 2.6.36

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=21542


Ville Aakko <ville.aakko@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #35642|Xorg log while running      |Xorg log while running
        description|2.6.36, no 50Hz modes       |2.6.36, no 50Hz modes not
                   |available                   |available




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[Bug 21542] Radeon: No 50Hz (PAL) modes available after upgrading to 2.6.36

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=21542





--- Comment #8 from Alex Deucher <alexdeucher@gmail.com>  2010-10-31 21:20:28 ---
Might be a duplicate of this bug:
https://bugs.freedesktop.org/show_bug.cgi?id=31154

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[Bug 21542] Radeon: No 50Hz (PAL) modes available after upgrading to 2.6.36

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=21542





--- Comment #9 from Ville Aakko <ville.aakko@gmail.com>  2010-11-01 17:26:06 ---
Hi,

I tried the patch from freedesktop bug #31154, but it has no apparent effect
here.

Also about the EDID information missing in 2.6.36 Xorg.log I mentioned above -
I was wrong it is there (see the logs, they are correct, my comment is not).

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[Bug 21542] Radeon: No 50Hz (PAL) modes available after upgrading to 2.6.36

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=21542


Ville Aakko <ville.aakko@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ajax@redhat.com,
                   |                            |ville.aakko@gmail.com




--- Comment #10 from Ville Aakko <ville.aakko@gmail.com>  2011-02-06 14:08:14 ---
Hi!

I finally did the bisect and got this as a result after a lot of rebooting:

"
139315796778a6d5f67c644e2ff470ddc69efb7b is the first bad commit
commit 139315796778a6d5f67c644e2ff470ddc69efb7b
Author: Adam Jackson <ajax@redhat.com>
Date:   Tue Aug 3 14:38:19 2010 -0400

    drm/edid: Rewrite mode parse to use the generic detailed block walk

    This brings us in line with the EDID spec recommendation for mode
    priority sorting.  We still don't extract all the modes we could from
    VTB, but VTB is so rare in the wild that I'm not really concerned.

    Signed-off-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>

:040000 040000 45961f1c7578731e21b979ca5aee07f4a365e2a7
64e2fb592862d8a69505c6d65ea57119a7202fcc M      drivers
"

Maybe this should be changed to Video(Other) as this probably applies to all
graphic cards?

Do you need the bisect log?

Cheers!
- Ville

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Re: [Bug 21542] Radeon: No 50Hz (PAL) modes available after upgrading to 2.6.36

[Piotr Gluszenia Slawinski]

> I finally did the bisect and got this as a result after a lot of rebooting:
>
> "
> 139315796778a6d5f67c644e2ff470ddc69efb7b is the first bad commit
> commit 139315796778a6d5f67c644e2ff470ddc69efb7b
> Author: Adam Jackson <ajax@redhat.com>
> Date:   Tue Aug 3 14:38:19 2010 -0400

<...>

> Maybe this should be changed to Video(Other) as this probably applies to all
> graphic cards?
>
> Do you need the bisect log?
>

thanx. some time ago i've also noticed i can't set up 50hz modes
on various hw. while previously i could, so i can confirm it affects
other hw.

50hz modes are esp. usefull on analog LCD screens (slows down pixel
clock, so improves sharpness)  , slow hw (bit less stress on VRAM),
  and when using programs like vice , fuse, or other sw. emulating PAL 
computer with exact refresh rate (i do not know why, but they work much 
slower and stutter - probably because vblank signal is firing too often,
trigering update which could be deferred a bit more).


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[Bug 21542] Radeon: No 50Hz (PAL) modes available after upgrading to 2.6.36

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=21542





--- Comment #11 from curious@bwv190.internetdsl.tpnet.pl <curious@bwv190.internetdsl.tpnet.pl>  2011-02-07 00:21:45 ---
> I finally did the bisect and got this as a result after a lot of rebooting:
>
> "
> 139315796778a6d5f67c644e2ff470ddc69efb7b is the first bad commit
> commit 139315796778a6d5f67c644e2ff470ddc69efb7b
> Author: Adam Jackson <ajax@redhat.com>
> Date:   Tue Aug 3 14:38:19 2010 -0400

<...>

> Maybe this should be changed to Video(Other) as this probably applies to all
> graphic cards?
>
> Do you need the bisect log?
>

thanx. some time ago i've also noticed i can't set up 50hz modes
on various hw. while previously i could, so i can confirm it affects
other hw.

50hz modes are esp. usefull on analog LCD screens (slows down pixel
clock, so improves sharpness)  , slow hw (bit less stress on VRAM),
  and when using programs like vice , fuse, or other sw. emulating PAL 
computer with exact refresh rate (i do not know why, but they work much 
slower and stutter - probably because vblank signal is firing too often,
trigering update which could be deferred a bit more).

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[Bug 21542] Radeon: No 50Hz (PAL) modes available after upgrading to 2.6.36

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=21542


Ville Aakko <ville.aakko@gmail.com> changed:

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




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[Bug 21542] [BISECTED]Radeon: No 50Hz (PAL) modes available after upgrading to 2.6.36

[bugzilla-daemon]

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Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alan@lxorguk.ukuu.org.uk
            Summary|Radeon: No 50Hz (PAL) modes |[BISECTED]Radeon: No 50Hz
                   |available after upgrading   |(PAL) modes available after
                   |to 2.6.36                   |upgrading to 2.6.36




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[Bug 21542] [BISECTED]Radeon: No 50Hz (PAL) modes available after upgrading to 2.6.36

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Alan <alan@lxorguk.ukuu.org.uk> changed:

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

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