[Bug 45968] New: [RADEON:KMS:RS780:HD3200] l 2560x1440 detected by monitor as 1280x1440, every second pixel missing

[Bug 45968] New: [RADEON:KMS:RS780:HD3200] l 2560x1440 detected by monitor as 1280x1440, every second pixel missing

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=45968

             Bug #: 45968
           Summary: [RADEON:KMS:RS780:HD3200] l 2560x1440 detected by
                    monitor as 1280x1440, every second pixel missing
    Classification: Unclassified
           Product: DRI
           Version: unspecified
          Platform: Other
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: ranma+freedesktop@tdiedrich.de


My new monitors native resolution is 2560x1440 which requires dual-link.
I'm using the DVI-Cable that came with the monitor.
KMS/Xorg claims to have set the resolution to 2560x1440.

Debian/unstable
Linux 3.3.0-rc3 (built from source)
libdrm 2.4.31-0 (built from source)
xserver-xorg              1:7.6+11 
xserver-xorg-video-radeon 1:6.14.3-2 (tried building from source, had the same problem)
Gigabyte GA-MA78GPM-DS2H

As a workaround, custom 2560x1440@30 and 2560x1440@24 modelines work, but seems very suboptimal...

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[Bug 45968] [RADEON:KMS:RS780:HD3200] l 2560x1440 detected by monitor as 1280x1440, every second pixel missing

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=45968

--- Comment #3 from Tobias Diedrich <ranma+freedesktop@tdiedrich.de> 2012-02-13 08:13:07 UTC ---
Created attachment 56975
  --> https://bugs.freedesktop.org/attachment.cgi?id=56975
xrandr --verbose output

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[Bug 45968] [RADEON:KMS:RS780:HD3200] l 2560x1440 detected by monitor as 1280x1440, every second pixel missing

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https://bugs.freedesktop.org/show_bug.cgi?id=45968

--- Comment #1 from Alex Deucher <agd5f@yahoo.com> 2012-02-13 05:27:57 PST ---
Please attach your xorg log, dmesg output, and xrandr --verbose output.

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[Bug 45968] [RADEON:KMS:RS780:HD3200] l 2560x1440 detected by monitor as 1280x1440, every second pixel missing

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https://bugs.freedesktop.org/show_bug.cgi?id=45968

--- Comment #2 from Tobias Diedrich <ranma+freedesktop@tdiedrich.de> 2012-02-13 08:12:35 PST ---
Created attachment 56974
  --> https://bugs.freedesktop.org/attachment.cgi?id=56974
Xorg log

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[Bug 45968] [RADEON:KMS:RS780:HD3200] l 2560x1440 detected by monitor as 1280x1440, every second pixel missing

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https://bugs.freedesktop.org/show_bug.cgi?id=45968

--- Comment #4 from Tobias Diedrich <ranma+freedesktop@tdiedrich.de> 2012-02-13 08:16:57 PST ---
Created attachment 56977
  --> https://bugs.freedesktop.org/attachment.cgi?id=56977
dmesg output

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[Bug 45968] [RADEON:KMS:RS780:HD3200] l 2560x1440 detected by monitor as 1280x1440, every second pixel missing

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https://bugs.freedesktop.org/show_bug.cgi?id=45968

--- Comment #5 from Tobias Diedrich <ranma+freedesktop@tdiedrich.de> 2012-02-13 08:18:44 PST ---
Created attachment 56979
  --> https://bugs.freedesktop.org/attachment.cgi?id=56979
video bios rom

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[Bug 45968] [RADEON:KMS:RS780:HD3200] l 2560x1440 detected by monitor as 1280x1440, every second pixel missing

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https://bugs.freedesktop.org/show_bug.cgi?id=45968

--- Comment #6 from Alex Deucher <agd5f@yahoo.com> 2012-02-13 08:22:51 PST ---
Does it work ok with a pre3.3 kernel (e.g., 3.2, 3.1, etc.)?  If so, does reverting this commit fix the issue?

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=9aa59993e226af94088adaee993eb8cfd33ae295

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[Bug 45968] [RADEON:KMS:RS780:HD3200] l 2560x1440 detected by monitor as 1280x1440, every second pixel missing

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https://bugs.freedesktop.org/show_bug.cgi?id=45968

--- Comment #7 from Tobias Diedrich <ranma+freedesktop@tdiedrich.de> 2012-02-13 08:27:05 PST ---
(In reply to comment #6)
> Does it work ok with a pre3.3 kernel (e.g., 3.2, 3.1, etc.)?  If so, does reverting this commit fix the issue?
> 
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=9aa59993e226af94088adaee993eb8cfd33ae295

It didn't work with 3.2.4, which is why tried 3.3-rc.

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[Bug 45968] [RADEON:KMS:RS780:HD3200] l 2560x1440 detected by monitor as 1280x1440, every second pixel missing

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https://bugs.freedesktop.org/show_bug.cgi?id=45968

--- Comment #8 from Tobias Diedrich <ranma+freedesktop@tdiedrich.de> 2012-02-13 08:28:23 PST ---
(In reply to comment #7)
> (In reply to comment #6)
> > Does it work ok with a pre3.3 kernel (e.g., 3.2, 3.1, etc.)?  If so, does reverting this commit fix the issue?
> > 
> > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=9aa59993e226af94088adaee993eb8cfd33ae295
> 
> It didn't work with 3.2.4, which is why tried 3.3-rc.

Looking at the mentioned patch I should actually retry HDMI, which with 3.2.4 only supported up to 1920xsomething

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[Bug 45968] [RADEON:KMS:RS780:HD3200] l 2560x1440 detected by monitor as 1280x1440, every second pixel missing

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https://bugs.freedesktop.org/show_bug.cgi?id=45968

--- Comment #9 from Tobias Diedrich <ranma+freedesktop@tdiedrich.de> 2012-02-14 03:00:35 PST ---
FWIW using HDMI on 3.3-rc I can go up to 2560x1440@48, but 2560x1440@60 is above the 340MHz pixelclock limit for one link.

I installed XP yesterday and found that it shows the same problem with dual-link not working properly, so this seems to be just a case of bad HW.

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[Bug 45968] [RADEON:KMS:RS780:HD3200] l 2560x1440 detected by monitor as 1280x1440, every second pixel missing

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https://bugs.freedesktop.org/show_bug.cgi?id=45968

Alex Deucher <agd5f@yahoo.com> changed:

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

--- Comment #10 from Alex Deucher <agd5f@yahoo.com> 2012-02-14 06:01:56 PST ---
Seems like the oem may not have wired up the DVI port correctly for duallink.

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[Bug 45968] [RADEON:KMS:RS780:HD3200] l 2560x1440 detected by monitor as 1280x1440, every second pixel missing

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https://bugs.freedesktop.org/show_bug.cgi?id=45968

--- Comment #11 from Roland Scheidegger <sroland@vmware.com> 2012-02-14 10:04:35 PST ---
(In reply to comment #9)
> FWIW using HDMI on 3.3-rc I can go up to 2560x1440@48, but 2560x1440@60 is above the 340MHz pixelclock limit for one link.

I'm surprised this old hw supports 340Mhz pixelclock on hdmi, I thought only Tahiti could do that, and monitors wouldn't support it neither typically (though I
know some hw tolerates overclocking tmds quite well).
In any case 2560x1440@60Hz should be clearly below 340Mhz with reduced blanking (around 250Mhz).

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