[Bug 52256] New: KMS doesn't work with radeon HD 7520G

[Bug 52256] New: KMS doesn't work with radeon HD 7520G

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https://bugs.freedesktop.org/show_bug.cgi?id=52256

             Bug #: 52256
           Summary: KMS doesn't work with radeon HD 7520G
    Classification: Unclassified
           Product: DRI
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: lrn1986@gmail.com


Created attachment 64375
  --> https://bugs.freedesktop.org/attachment.cgi?id=64375
syslog (the result of modeprobe -v radeon modeset=1)

3.4.4 boots into black screen (backlight is off).
Boots fine with radeon.modeset=0 (with appropriate lack of 3D acceleration).
Boots fine with radeon being blacklisted (same as above).
amd64 microcode is installed. Installed ARUBA_* firmware manually (not packaged
for Debian yet).
Compiled fresh libdrm, mesa and xf86-video-ati from git (installed into
/usr/xorg, added that directory to modulepath in xorg.conf, added /usr/xorg/lib
to /etc/ld.so.conf.d/a-local-xorg.conf
ssh'ed into my laptop, issued sudo modprobe -v drm debug=1 && sudo modprobe -v
radeon modeset=1
Black screen all over again :(

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[Bug 52256] KMS doesn't work with radeon HD 7520G

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https://bugs.freedesktop.org/show_bug.cgi?id=52256

--- Comment #1 from LRN <lrn1986@gmail.com> 2012-07-22 14:07:11 PDT ---
Tried with HEAD kernel (3.5.0-rc7) - same thing.
Worst thing is, from the logs it is not apparent (to me) what exactly is wrong.

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[Bug 52256] KMS doesn't work with radeon HD 7520G

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https://bugs.freedesktop.org/show_bug.cgi?id=52256

--- Comment #2 from LRN <lrn1986@gmail.com> 2012-07-22 16:27:27 PDT ---
Here's a piece of syslog with drm debugging set to 0x04, and with some extra
lines of my own:

Jul 22 19:40:13 APC2 kernel: [   10.010370] [drm:radeon_dp_link_train_cr],
clock recovery at voltage 0 pre-emphasis 0
Jul 22 19:40:13 APC2 kernel: [   10.010550] [drm:radeon_dp_link_train_ce],
radeon_dp_link_train_ce: Using training pattern 2
Jul 22 19:40:13 APC2 kernel: [   10.010551] [drm:radeon_dp_link_train_ce],
radeon_dp_link_train_ce: Interval is 0, delaying for 400
Jul 22 19:40:13 APC2 kernel: [   10.012180] [drm:radeon_dp_get_link_status],
link status 01 00 80 00 04 00
Jul 22 19:40:13 APC2 kernel: [   10.012182] [drm:dp_channel_eq_ok],
dp_channel_eq_ok: lane count = 1, lane align = 0x80; is & 0x1?
Jul 22 19:40:13 APC2 kernel: [   10.012184] [drm:dp_channel_eq_ok],
dp_channel_eq_ok: Not done, return false
Jul 22 19:40:13 APC2 kernel: [   10.012184] [drm:dp_get_adjust_train],
requested signal parameters: lane 0 voltage 0.4V pre_emph 3.5dB
Jul 22 19:40:13 APC2 kernel: [   10.012186] [drm:dp_get_adjust_train], using
signal parameters: voltage 0.4V pre_emph 3.5dB
Jul 22 19:40:13 APC2 kernel: [   10.013661] [drm:radeon_dp_link_train_ce],
radeon_dp_link_train_ce: Interval is 0, delaying for 400
Jul 22 19:40:13 APC2 kernel: [   10.015282] [drm:radeon_dp_get_link_status],
link status 01 00 80 00 08 00
Jul 22 19:40:13 APC2 kernel: [   10.015283] [drm:dp_channel_eq_ok],
dp_channel_eq_ok: lane count = 1, lane align = 0x80; is & 0x1?
Jul 22 19:40:13 APC2 kernel: [   10.015285] [drm:dp_channel_eq_ok],
dp_channel_eq_ok: Not done, return false
Jul 22 19:40:13 APC2 kernel: [   10.015285] [drm:dp_get_adjust_train],
requested signal parameters: lane 0 voltage 0.4V pre_emph 6dB
Jul 22 19:40:13 APC2 kernel: [   10.015286] [drm:dp_get_adjust_train], using
signal parameters: voltage 0.4V pre_emph 6dB
Jul 22 19:40:13 APC2 kernel: [   10.016631] [drm:radeon_dp_link_train_ce],
radeon_dp_link_train_ce: Interval is 0, delaying for 400
Jul 22 19:40:13 APC2 kernel: [   10.018249] [drm:radeon_dp_get_link_status],
link status 01 00 80 00 0c 00
Jul 22 19:40:13 APC2 kernel: [   10.018250] [drm:dp_channel_eq_ok],
dp_channel_eq_ok: lane count = 1, lane align = 0x80; is & 0x1?
Jul 22 19:40:13 APC2 kernel: [   10.018251] [drm:dp_channel_eq_ok],
dp_channel_eq_ok: Not done, return false
Jul 22 19:40:13 APC2 kernel: [   10.018252] [drm:dp_get_adjust_train],
requested signal parameters: lane 0 voltage 0.4V pre_emph 9.5dB
Jul 22 19:40:13 APC2 kernel: [   10.018253] [drm:dp_get_adjust_train], using
signal parameters: voltage 0.4V pre_emph 9.5dB
Jul 22 19:40:13 APC2 kernel: [   10.019640] [drm:radeon_dp_link_train_ce],
radeon_dp_link_train_ce: Interval is 0, delaying for 400
Jul 22 19:40:13 APC2 kernel: [   10.021260] [drm:radeon_dp_get_link_status],
link status 01 00 80 00 0c 00
Jul 22 19:40:13 APC2 kernel: [   10.021262] [drm:dp_channel_eq_ok],
dp_channel_eq_ok: lane count = 1, lane align = 0x80; is & 0x1?
Jul 22 19:40:13 APC2 kernel: [   10.021263] [drm:dp_channel_eq_ok],
dp_channel_eq_ok: Not done, return false
Jul 22 19:40:13 APC2 kernel: [   10.021264] [drm:dp_get_adjust_train],
requested signal parameters: lane 0 voltage 0.4V pre_emph 9.5dB
Jul 22 19:40:13 APC2 kernel: [   10.021265] [drm:dp_get_adjust_train], using
signal parameters: voltage 0.4V pre_emph 9.5dB
Jul 22 19:40:13 APC2 kernel: [   10.022647] [drm:radeon_dp_link_train_ce],
radeon_dp_link_train_ce: Interval is 0, delaying for 400
Jul 22 19:40:13 APC2 kernel: [   10.024267] [drm:radeon_dp_get_link_status],
link status 01 00 80 00 0c 00
Jul 22 19:40:13 APC2 kernel: [   10.024269] [drm:dp_channel_eq_ok],
dp_channel_eq_ok: lane count = 1, lane align = 0x80; is & 0x1?
Jul 22 19:40:13 APC2 kernel: [   10.024270] [drm:dp_channel_eq_ok],
dp_channel_eq_ok: Not done, return false
Jul 22 19:40:13 APC2 kernel: [   10.024271] [drm:dp_get_adjust_train],
requested signal parameters: lane 0 voltage 0.4V pre_emph 9.5dB
Jul 22 19:40:13 APC2 kernel: [   10.024272] [drm:dp_get_adjust_train], using
signal parameters: voltage 0.4V pre_emph 9.5dB
Jul 22 19:40:13 APC2 kernel: [   10.025655] [drm:radeon_dp_link_train_ce],
radeon_dp_link_train_ce: Interval is 0, delaying for 400
Jul 22 19:40:13 APC2 kernel: [   10.027274] [drm:radeon_dp_get_link_status],
link status 01 00 80 00 0c 00
Jul 22 19:40:13 APC2 kernel: [   10.027276] [drm:dp_channel_eq_ok],
dp_channel_eq_ok: lane count = 1, lane align = 0x80; is & 0x1?
Jul 22 19:40:13 APC2 kernel: [   10.027278] [drm:dp_channel_eq_ok],
dp_channel_eq_ok: Not done, return false
Jul 22 19:40:13 APC2 kernel: [   10.027280] [drm:dp_get_adjust_train],
requested signal parameters: lane 0 voltage 0.4V pre_emph 9.5dB
Jul 22 19:40:13 APC2 kernel: [   10.027281] [drm:dp_get_adjust_train], using
signal parameters: voltage 0.4V pre_emph 9.5dB
Jul 22 19:40:13 APC2 kernel: [   10.028659] [drm:radeon_dp_link_train_ce],
radeon_dp_link_train_ce: Interval is 0, delaying for 400
Jul 22 19:40:13 APC2 kernel: [   10.030279] [drm:radeon_dp_get_link_status],
link status 01 00 80 00 0c 00
Jul 22 19:40:13 APC2 kernel: [   10.030281] [drm:dp_channel_eq_ok],
dp_channel_eq_ok: lane count = 1, lane align = 0x80; is & 0x1?
Jul 22 19:40:13 APC2 kernel: [   10.030282] [drm:dp_channel_eq_ok],
dp_channel_eq_ok: Not done, return false
Jul 22 19:40:13 APC2 kernel: [   10.030283] [drm:radeon_dp_link_train_ce]
*ERROR* channel eq failed: 5 tries
Jul 22 19:40:13 APC2 kernel: [   10.030284] [drm:radeon_dp_link_train_ce]
*ERROR* channel eq failed

#27314 mentions something similar. Well, at least link status looks more real
here than there. Anyway, the problem is in lack of DP alignment (whatever that
is...).

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[Bug 52256] KMS doesn't work with radeon HD 7520G

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https://bugs.freedesktop.org/show_bug.cgi?id=52256

Alex Deucher <agd5f@yahoo.com> changed:

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

--- Comment #4 from Alex Deucher <agd5f@yahoo.com> 2012-07-23 14:58:48 UTC ---
*** Bug 52373 has been marked as a duplicate of this bug. ***

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[Bug 52256] KMS doesn't work with radeon HD 7520G

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Alex Deucher <agd5f@yahoo.com> changed:

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

--- Comment #3 from Alex Deucher <agd5f@yahoo.com> 2012-07-23 14:58:05 PDT ---
*** Bug 52081 has been marked as a duplicate of this bug. ***

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[Bug 52256] ARUBA DP link training problems

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https://bugs.freedesktop.org/show_bug.cgi?id=52256

Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|KMS doesn't work with       |ARUBA DP link training
                   |radeon HD 7520G             |problems

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[Bug 52256] Trinity (ARUBA) DP link training problems

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https://bugs.freedesktop.org/show_bug.cgi?id=52256

Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|ARUBA DP link training      |Trinity (ARUBA) DP link
                   |problems                    |training problems

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[Bug 52256] Trinity (ARUBA) DP link training problems

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--- Comment #5 from LRN <lrn1986@gmail.com> 2012-08-07 15:57:46 UTC ---
In case somebody is still watching this, i've tried 3.6.0-rc1, which features
this commit (and its followups) -
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=949c4a34afacfe800fc442afac117aba15284962
And it doesn't fix the problem.

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[Bug 52256] Trinity (ARUBA) DP link training problems

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https://bugs.freedesktop.org/show_bug.cgi?id=52256

--- Comment #6 from LRN <lrn1986@gmail.com> 2012-08-19 10:19:17 UTC ---
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=f59abbf28696389c91c2697c7db31f20cfa91d8a
doesn't work either.

Are you sure there are no patches that i could try? I've tried to look up the
ones on #27314 , but they are against an old kernel version, and some of them
were (apparently) applied in some manner.

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[Bug 52256] Trinity (ARUBA) DP link training problems

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https://bugs.freedesktop.org/show_bug.cgi?id=52256

--- Comment #7 from Christian König <deathsimple@vodafone.de> 2012-08-19 10:25:18 UTC ---
I also have DP link problems on the trinity testing board I have.

Always thought that this is just a problem because it is a beta or even alpha
board, but that doesn't seems to be the case.

@Alex: So I can test any patches/ideas you've got.

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[Bug 52256] Trinity (ARUBA) DP link training problems

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https://bugs.freedesktop.org/show_bug.cgi?id=52256

--- Comment #8 from Alex Deucher <agd5f@yahoo.com> 2012-08-30 00:13:43 UTC ---
Should be fixed in my drm-next-3.6 branch:
http://cgit.freedesktop.org/~agd5f/linux/log/?h=drm-fixes-3.6
there are several patches required.  The patches should show up in stable
kernels as well once Dave pulls them.

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[Bug 52256] Trinity (ARUBA) DP link training problems

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--- Comment #9 from LRN <lrn1986@gmail.com> 2012-08-30 01:40:44 UTC ---
Pulled your drm-next-3.6 branch, and merged with current linux master.
Display now works!

There are font rendering problems with X server, but that's another issue.

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[Bug 52256] Trinity (ARUBA) DP link training problems

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LRN <lrn1986@gmail.com> changed:

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

--- Comment #10 from LRN <lrn1986@gmail.com> 2012-09-02 18:02:28 UTC ---
Recompiled and installed latest libdrm + mesa + radeon driver, that fixed font
corruption in Gnome 3.

I thereby pronounce this bug resolved and fixed.

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[Bug 52256] Trinity (ARUBA) DP link training problems

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--- Comment #11 from eandry@free.fr <eandry@free.fr> 2012-09-10 09:43:34 UTC ---
Hi !

Will the fix be backported to previous kernel releases ?
Because next ubuntu will be using 3.5.x ... (and the current precise doesn't
handle the graphic card and use vesa driver, which is not perfect usable but
usable)
And this bug is a real blocker for ARUBA users.

But at least thank for the fix, I can use my gentoo on my brand new Samsung
Laptop !

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[Bug 52256] Trinity (ARUBA) DP link training problems

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--- Comment #12 from Alex Deucher <agd5f@yahoo.com> 2012-09-10 13:08:32 UTC ---
(In reply to comment #11)
> Hi !
> 
> Will the fix be backported to previous kernel releases ?

Yes, the patches will show up in the stable kernel series.

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