[Bug 81382] Text console blanking does not go away

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https://bugs.freedesktop.org/show_bug.cgi?id=81382

Alex Deucher  changed:

   What|Removed |Added

 Resolution|--- |FIXED
 Status|NEW |RESOLVED

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--- Comment #42 from David Heidelberg (okias)  ---
Maybe this bug can be closed?

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--- Comment #41 from Christophe Migliorini  ---
Good. Hopefully into 12.04LTS before it's no longer supported :-).

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--- Comment #40 from Alex Deucher  ---
(In reply to Alex Deucher from comment #39)
> (In reply to Christophe Migliorini from comment #38)
> > Well, I did, '2014-09-17 15:38 UTC' and '2014-09-17 15:39 UTC' patches apply
> > ok and it works.  Sorry for the inconvenience.
> > (perhaps one should consider pushing these two upstream instead of the fist
> > one?)...
> 
> Those patches are upstream as well.

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bc13018b5eba26ca229b33763c9e61fac31a1925
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8aff6ad5a393b8e2ad00dce4d278ecf41397bf0d

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--- Comment #39 from Alex Deucher  ---
(In reply to Christophe Migliorini from comment #38)
> Well, I did, '2014-09-17 15:38 UTC' and '2014-09-17 15:39 UTC' patches apply
> ok and it works.  Sorry for the inconvenience.
> (perhaps one should consider pushing these two upstream instead of the fist
> one?)...

Those patches are upstream as well.

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--- Comment #38 from Christophe Migliorini  ---
Well, I did, '2014-09-17 15:38 UTC' and '2014-09-17 15:39 UTC' patches apply ok
and it works.  Sorry for the inconvenience.
(perhaps one should consider pushing these two upstream instead of the fist
one?)...

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--- Comment #37 from Christophe Migliorini  ---
Apparently only "set the default backlight level to something reasonable" patch
was applied to 3.13, so I don't have the "radeon_encoder_add_backlight"
function, thus this won't work at all.

Would you suggest I first apply the patch published here on 2014-09-17?

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--- Comment #36 from Alex Deucher  ---
Should be fixed in this patch:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b7bc596ebbe0cddc97d76ef9309f64471bbf13eb

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Christophe Migliorini  changed:

   What|Removed |Added

 CC||mig+freedesktop at chene.vingt
   ||-et-un-cinq.fr

--- Comment #35 from Christophe Migliorini  ---
Created attachment 115253
  --> https://bugs.freedesktop.org/attachment.cgi?id=115253=edit
lspci -vnn for Christophe's iMac

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--- Comment #34 from Christophe Migliorini  ---
Hi, it took me quite some time to get here, but hopefully you can still solve
my problem.
I'm running a 2006 Intel iMac (Core Duo) under Unbuntu 12.04LTS server, which
sits on my desk and almost never log to the console, which would normally go
blank a few minutes after boot.

There is strong evidence that this patch found its way to my "stock" kernel
back in september 2014, and since then my iMac exhibits the following behaviour
after boot:
- whenever the console blanking activates, backlight goes to MAX (with my LCD
screen going all strange and overheating — even causing fans to blow)
- only way out is to echo 0 > /sys/class/backlight/radeon_bl0/brightness —
which I 'crontabbed' but is not exactly satisfactory.
- any other value causes the backlight to go all the way up and overheat.

I did try to "echo 1 > /sys/class/backlight/acpi_video0/brightness" today, and
that caused the iMac to reboot.

I have not experimented anything else, but would be happy to help.

uname is "Linux xxx 3.13.0-49-generic #81~precise1-Ubuntu SMP Wed Mar 25
16:32:40 UTC 2015 i686 i686 i386 GNU/Linux"

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--- Comment #33 from Dieter N?tzel  ---
They are in Linus 3.17 tree:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=005f800508eb391480f463dad3d54e5b4ec67d57

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--- Comment #32 from Patrick  ---
I've just tested the patches on my notebook, too. Also here, the problem is
fixed, with the patches you provided.

Do you already know, in which upstream versions, the fix will be published?
3.17? Or in an 3.16.x already?

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--- Comment #31 from Alex Deucher  ---
(In reply to comment #30)
> Created attachment 106554 [details]
> lspci -vnn for Daniel's amilo

You have the same configuration as Patrick.

(In reply to comment #29)
> I tested the patches from 2014-09-17 against 3.17-rc5.
> 
> When I applied both patches,  the backlight was not turned off, when the
> kernel switched into graphics mode. 
> The kernel worked very well.

Great.  I'll make sure the patches get upstream.  Thanks for testing.

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--- Comment #30 from Daniel Kirsten  ---
Created attachment 106554
  --> https://bugs.freedesktop.org/attachment.cgi?id=106554=edit
lspci -vnn for Daniel's amilo

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--- Comment #29 from Daniel Kirsten  ---
I tested the patches from 2014-09-17 against 3.17-rc5.

When I applied both patches,  the backlight was not turned off, when the kernel
switched into graphics mode. 
The kernel worked very well.

Without the patches, the backlight was turned off, when the kernel switched
into graphics mode.

Daniel

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--- Comment #28 from Alex Deucher  ---
(In reply to comment #26)
> (In reply to comment #25)
> 
> The pci-id of the VGA Controller is 01:00.0 for my Amilo.

That's the bus id.  I need the output of lspci -vnn

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--- Comment #27 from Alex Deucher  ---
They are written against 3.17.

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--- Comment #26 from Daniel Kirsten  ---
(In reply to comment #25)

The pci-id of the VGA Controller is 01:00.0 for my Amilo.

However, I cannot apply the patches to the 3.14.18-100.fc19 kernel:

patch --dry-run -p1 <
~/software/0001-drm-radeon-add-a-module-parameter-for-backlight-cont.patch
checking file drivers/gpu/drm/radeon/radeon.h
Hunk #1 FAILED at 106.
1 out of 1 hunk FAILED
checking file drivers/gpu/drm/radeon/radeon_drv.c
Hunk #1 FAILED at 181.
Hunk #2 succeeded at 237 with fuzz 2 (offset -26 lines).
1 out of 2 hunks FAILED
checking file drivers/gpu/drm/radeon/radeon_encoders.c
Exit 1


patch --dry-run -p1 <
~/software/0002-drm-radeon-add-a-backlight-quirk-for-Amilo-Xi-2550.patch
checking file drivers/gpu/drm/radeon/radeon_encoders.c
Hunk #1 FAILED at 173.
1 out of 1 hunk FAILED
Exit 1


Which kernel should I use to test the patches?

Daniel

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--- Comment #25 from Alex Deucher  ---
(In reply to comment #24)
> Apply them both together.

Well, assuming your laptop has the same pci ids as Patrick.  If not, just
append radeon.backlight=0 to the kernel command line in grub and attach your
lspci -vnn output.

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--- Comment #24 from Alex Deucher  ---
Apply them both together.

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--- Comment #23 from Daniel Kirsten  ---
I can test the patches from 2014-09-17 on my amilo.

Can I apply them to the current fedora kernel code 3.14.18-100?

Should I apply both patches or test each patch separately?

Daniel

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--- Comment #22 from Patrick  ---
Thanks for the patch, but I'm on vacation till 26th September, so long I cannot
test it.

@Daniel
As you've got the same problem, could you test the patches?

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--- Comment #21 from Alex Deucher  ---
Created attachment 106442
  --> https://bugs.freedesktop.org/attachment.cgi?id=106442=edit
patch 2/2

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--- Comment #20 from Alex Deucher  ---
Created attachment 106441
  --> https://bugs.freedesktop.org/attachment.cgi?id=106441=edit
patch 1/2

Do the attached patches help?  The first patch adds a backlight module
parameter to disable the gpu backlight device for testing.  The second adds a
quirk for the Amilo laptop.

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--- Comment #19 from Patrick  ---
Created attachment 106410
  --> https://bugs.freedesktop.org/attachment.cgi?id=106410=edit
lspci -vnn for Amilo

sure, here it is

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--- Comment #18 from Alex Deucher  ---
Can you attach the lspci -vnn output for your GPU?

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Alex Deucher  changed:

   What|Removed |Added

 Attachment #106354|text/plain  |application/octet-stream
  mime type||

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--- Comment #17 from Patrick  ---
(In reply to comment #14)

This could be true. I can control it via
/sys/class/backlight/acpi_video0/brightness. If I change
/sys/class/backlight/radeon_bl0/brightness then the display is nearly black and
cannot be restored.

After reboot the following values are set:
acpi_video0 = 7
radeon_bl0 = 0

I've attached a lspci -vvv to " lspci output for amilo" and the vbios to "vbios
from Amilo"

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Patrick  changed:

   What|Removed |Added

 Attachment #106354|from Amilo  |vbios from Amilo
description||

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--- Comment #16 from Patrick  ---
Created attachment 106354
  --> https://bugs.freedesktop.org/attachment.cgi?id=106354=edit
from Amilo

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--- Comment #15 from Patrick  ---
Created attachment 106353
  --> https://bugs.freedesktop.org/attachment.cgi?id=106353=edit
lspci output for amilo

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--- Comment #14 from Alex Deucher  ---
(In reply to comment #11)
> If I change /sys/class/backlight/radeon_bl0/brightness or
> /sys/class/backlight/acpi_video0 the display stayes dark.
> 
> @Alex
> is this what you wanted to know? If not, please let me know, how I could
> help you to debug this problem!

Without the patch from this bug report applied (e.g., when your display is
working), which, if any, of the blacklight interfaces work?  It seems like
perhaps your laptop claims to have a GPU controlled backlight, but really uses
an external backlight control.  Can you attach a copy of your vbios?  TO get a
copy of your vbios:

(as root)
(use lspci to get the bus id)
cd /sys/bus/pci/devices/
echo 1 > rom
cat rom > /tmp/vbios.rom
echo 0 > rom

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--- Comment #13 from Patrick  ---
(In reply to comment #12)

Hi Daniel,

correct, before that patch, the display was controllable through
/sys/class/backlight/acpi_video0/brightness.

After that patch, the display is always dark.

The only change which was done by Alex, was adding the lines, which you
commeted out. (If I understood the code correct, the other two lines, which
were removed, are obsolete and not needed).

So if you removed that two lines, then you've got the same code as before and
our Amilo (with ATI card) is working fine, but Denys problem will appear
again...

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--- Comment #12 from Daniel Kirsten  ---
(In reply to comment #11)
> I've got the same notebook as Daniel Kirsten, 

They sold different Amilo Xi 2550, there are even some Amilo Xi 2550 with 
an Nvidia graphic card.

> If I change /sys/class/backlight/radeon_bl0/brightness or
> /sys/class/backlight/acpi_video0 the display stayes dark.

I can control brightness by writing 0-7 into 
/sys/class/backlight/acpi_video0/brightness

You should comment out lines 233-234 in
drivers/gpu/drm/radeon/atombios_encoders.c,
i.e., 

/*  if (bd->props.brightness == 0)
234 bd->props.brightness = RADEON_MAX_BL_LEVEL;*/

then it works.

Daniel

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--- Comment #11 from Patrick  ---
I've got the same notebook as Daniel Kirsten, so I've searched for changes in
the kernel code, which caused the dark screen. From that point, I've found the
patch  from Alex Deucher and this bug report.

If I change /sys/class/backlight/radeon_bl0/brightness or
/sys/class/backlight/acpi_video0 the display stayes dark.

@Alex
is this what you wanted to know? If not, please let me know, how I could help
you to debug this problem!

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--- Comment #10 from Alex Deucher  ---
(In reply to comment #7)
> Ok, this fix work, but cause another problem (tested with 3.15.5+patch and
> 3.16.1).
> 
> When display goes off, backlight goes off.
> When display goes on, backlight is set to MAX.
> When display goes off again, backligh remains MAX.
> After pressing key, LCD works, backlight stay at MAX level.
> When display goes off, backlight is still MAX.

Does the backlight respond correctly when adjusted via the sysfs blacklight
interface?

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--- Comment #9 from Denys Vlasenko  ---
(In reply to comment #7)
> Ok, this fix work, but cause another problem (tested with 3.15.5+patch and
> 3.16.1).
> 
> When display goes off, backlight goes off.
> When display goes on, backlight is set to MAX.
> When display goes off again, backligh remains MAX.
> After pressing key, LCD works, backlight stay at MAX level.
> When display goes off, backlight is still MAX.

I would say it means that merely treating backlight value of 0 as MAX is not
the best idea.

Maybe we need an additional bool variable "failed to read initial BL value,
don't ever try to set it", set it if initial read of BL value is 0, and if it
is set, never try to change BL level?

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--- Comment #8 from Daniel Kirsten  ---
The above patch causes a problem on my Amilo Xi 2550 (RadeonHD 2600).

The behaviour for kernel-3.14.8-100.fc19 (without patch):

The value of /sys/class/backlight/radeon_bl0/brightness is 0. 
Whenever I write something (0-255) to 
/sys/class/backlight/radeon_bl0/brightness, 
the backlight is turned off, and I am not able to turn on the backlight again. 
However, I can still shutdown the system (Ctr+Alt+Fx, login as root, and give a 
shutdown command.

I can control the backlight by writing values 0-7 to
/sys/class/backlight/acpi_video0/brightness.

The behaviour for kernel-3.14.17-100.fc19 (with patch):

The backlight is turned off during the boot up process, when the kernel
switches into 
graphics mode.
I commented out the lines 233-234 in
drivers/gpu/drm/radeon/atombios_encoders.c, 
and then, the problem disappeared, i.e., the backlight stays on when the kernel
switches 
into graphics mode.

Best regards,
Daniel

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--- Comment #7 from David Heidelberger (okias)  
---
Ok, this fix work, but cause another problem (tested with 3.15.5+patch and
3.16.1).

When display goes off, backlight goes off.
When display goes on, backlight is set to MAX.
When display goes off again, backligh remains MAX.
After pressing key, LCD works, backlight stay at MAX level.
When display goes off, backlight is still MAX.

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[Bug 81382] Text console blanking does not go away

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https://bugs.freedesktop.org/show_bug.cgi?id=81382

--- Comment #6 from David Heidelberger (okias)  
---
Work perfectly on Toshiba A210-15j!


Tested-by: David Heidelberger 

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[Bug 81382] Text console blanking does not go away

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81382

--- Comment #5 from Alex Deucher  ---
Will do.

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[Bug 81382] Text console blanking does not go away

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81382

--- Comment #4 from Denys Vlasenko  ---
(In reply to comment #3)
> Created attachment 102856 [details] [review]
> set the default backlight level to something reasonable
> 
> Does this patch help?

Yes, it does.

Maybe add a comment there why this check is necessary?

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[Bug 81382] Text console blanking does not go away

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81382

--- Comment #3 from Alex Deucher  ---
Created attachment 102856
  --> https://bugs.freedesktop.org/attachment.cgi?id=102856=edit
set the default backlight level to something reasonable

Does this patch help?

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[Bug 81382] Text console blanking does not go away

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81382

Alex Deucher  changed:

   What|Removed |Added

 CC||david.heidelberger at ixit.cz

--- Comment #2 from Alex Deucher  ---
*** Bug 70207 has been marked as a duplicate of this bug. ***

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[Bug 81382] Text console blanking does not go away

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81382

--- Comment #1 from Denys Vlasenko  ---
Created attachment 102852
  --> https://bugs.freedesktop.org/attachment.cgi?id=102852=edit
Debugging messages patch

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