[Bug 88501] New: AMD/ATI RS690M Console blanks to white

[Bug 88501] New: AMD/ATI RS690M Console blanks to white

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=88501

            Bug ID: 88501
           Summary: AMD/ATI RS690M Console blanks to white
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.6.0-rc5 to 3.18.0-rc4
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: business.kid@gmail.com
        Regression: Yes

Created attachment 158181
  --> https://bugzilla.kernel.org/attachment.cgi?id=158181&action=edit
Git Bisect log, & git visualise o/p

Without X running, linux consoles blank after a period adjustable by setterm.
Mine does not. It goes white. If I invert the screen colours, it goes whiter.
Backlight?
I cloned the Linus-stable git and tried it. 3.18.0-rc4 twists this slightly -
The FIRST time the screen blanks, it does so correctly; every other time, it
blanks to white. 
I'm a hardware guy, not a software expert. Git bisect gives the output below.
Details of the box also attached

The box is a HP 6715S, twin core Turion, 3G ram. It's running Slackware-current
as of Sept 30th, 2014. LSPCI output attached. Bios Version: ATI 02/13/08,1.

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[Bug 88501] AMD/ATI RS690M Console blanks to white

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=88501

--- Comment #1 from business.kid@gmail.com ---
Created attachment 158191
  --> https://bugzilla.kernel.org/attachment.cgi?id=158191&action=edit
LSPCI -vnn

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[Bug 88501] AMD/ATI RS690M Console blanks to white

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=88501

--- Comment #2 from business.kid@gmail.com ---
Created attachment 158201
  --> https://bugzilla.kernel.org/attachment.cgi?id=158201&action=edit
Kernel Config 3.6.0-rc5+

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[Bug 88501] AMD/ATI RS690M Console blanks to white

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=88501

Alex Deucher <alexdeucher@gmail.com> changed:

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

--- Comment #3 from Alex Deucher <alexdeucher@gmail.com> ---
Does booting a recent kernel with radeon.backlight=0 fix the issue?

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[Bug 88501] AMD/ATI RS690M Console blanks to white

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=88501

--- Comment #4 from Alex Deucher <alexdeucher@gmail.com> ---
Created attachment 158211
  --> https://bugzilla.kernel.org/attachment.cgi?id=158211&action=edit
possible fix

Does this patch fix the issue (against 3.17 or newer kernel)?

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[Bug 88501] AMD/ATI RS690M Console blanks to white

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=88501

--- Comment #5 from business.kid@gmail.com ---
<Does booting a recent kernel with radeon.backlight=0 fix the issue?>
Yes, this fixes the issue on 3.18-rc4

<Does this patch fix the issue (against 3.17 or newer kernel)?>
No, it does not. I get the same behaviour - first time it blanks to dark, every
other time it blanks to white.

I am a very rusty amateur at C, but I will adjust that patch very slightly here
and have another go.

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[Bug 88501] AMD/ATI RS690M Console blanks to white

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=88501

--- Comment #6 from business.kid@gmail.com ---
Created attachment 158261
  --> https://bugzilla.kernel.org/attachment.cgi?id=158261&action=edit
Your patch slightly adjusted

This seems to work. I know little of C, and less of graphics programming, but I
got suspicious of the second 'if' construct inside a chain bracket, so I
tweaked syntax. I built it here and tried it.

I now am sorted out, thank you. If you want something else tried, let me know.
Otherwise, I assure you, I will *not* be building another kernel on that box
for quite some time!

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[Bug 88501] AMD/ATI RS690M Console blanks to white

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=88501

--- Comment #7 from Alex Deucher <alexdeucher@gmail.com> ---
The code should be fine as is.  Are you sure you tested the right kernel?

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[Bug 88501] AMD/ATI RS690M Console blanks to white

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=88501

--- Comment #8 from business.kid@gmail.com ---
Yes. I tested in order
1. 3.18.0-rc4 with no patch - white 2nd time.
2. 3.18.0-rc4 with the boot option - dark every time
3. 3.18.0-rc4 with your patch applied and no boot option - white 2nd time 
4. 3.18.0-rc4 with a syntax error :-/ module did not load.
5. 3.18.0-rc4 with the attached suggested fix, and no boot option. - dark every
time.

I have built ~ 20 kernels in the last few days, and am not keeping any of them.
The only reason I edited the patch was that I felt it unsafe to put an 'if'
below an 'else' in the same chain bracket. I have met some compilers that don't
respond to that as one would expect. I don't know what gcc does, and can't
swear that the logic follows correctly. I just tried it.

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[Bug 88501] AMD/ATI RS690M Console blanks to white

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=88501

pr0v1d3nc14@riseup.net changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pr0v1d3nc14@riseup.net

--- Comment #9 from pr0v1d3nc14@riseup.net ---
Have the same problem and no idea how to patch :( some may help?
RS690M on AMD Thurion 64x2...

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[Bug 88501] AMD/ATI RS690M Console blanks to white

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=88501

--- Comment #10 from Alex Deucher <alexdeucher@gmail.com> ---
The fix is already upstream.  Alternatively, you can boot with
radeon.backlight=0 on the kernel command line in grub.

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[Bug 88501] AMD/ATI RS690M Console blanks to white

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=88501

crocket (crockabiscuit@gmail.com) changed:

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

--- Comment #11 from crocket (crockabiscuit@gmail.com) ---
https://bugzilla.kernel.org/show_bug.cgi?id=202739 might be a fix.

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