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Upgrade Warnings - Backlight problem with 2.6.37 and Intel graphic cards

Sordon - 10.01.2011, 15:50
Post subject: Backlight problem with 2.6.37 and Intel graphic cards
There is currently a problem with the backlight on notebooks using an Intel graphic card and the new kernel 2.6.37.
It can happen that the display switches to the lowest possible setting and can't be restored to a brighter setting again (by using Fn function keys). More information in this bug report:
https://bugzilla.kernel.org/show_bug.cgi?id=22672

Best Regards,
Sordon

PS: On my notebook (Dell D620) this bug is unfortunately there and I'm waiting for a fix.
dpdt1 - 10.01.2011, 20:52
Post subject: RE: Backlight problem with 2.6.37 and Intel graphic cards
i dont have any serious problems with this, except for these boot messages :

kernel: [ 6.843327] [drm:intel_panel_get_max_backlight] *ERROR* fixme: max PWM is zero.

this appeared after first 2.6.37 aptosid kernel. same error with next one.

# infobash -v
Host/Kernel/OS "freedom" running Linux 2.6.37-0.slh.2-aptosid-amd64 x86_64 [ Debian GNU/Linux 6.0 ]
CPU Info (1) Intel Core2 Duo T7250 @ clocked at [ 800.000 MHz ]
(2) Intel Core2 Duo T7250 @ clocked at [ 2001.000 MHz ]
Videocard Intel Mobile GM965/GL960 Integrated Graphics Controller X.Org 1.7.7 [ 1280x800@60.0hz ]
Processes 138 | Uptime 17min | Memory 751.6/3014.0MB | HDD Size 1250GB (80%used) | Client Shell | Infobash v3.34
qord - 12.01.2011, 18:00
Post subject: Re: Backlight problem with 2.6.37 and Intel graphic cards
      Sordon wrote:
There is currently a problem with the backlight on notebooks using an Intel graphic card and the new kernel 2.6.37.
It can happen that the display switches to the lowest possible setting and can't be restored to a brighter setting again (by using Fn function keys). More information in this bug report:
https://bugzilla.kernel.org/show_bug.cgi?id=22672
.


The bug is also present on my Samsung N220... using .36 for the time being.

-cord
timrichardson - 13.01.2011, 01:02
Post subject: RE: Re: Backlight problem with 2.6.37 and Intel graphic card
2.6.37-0.shl.4 arrived in the repositories today (13 Jan). I guess it's the fourth 2.6.37 kernel although it's the third one I've noticed.
Are you referring to this kernel, or are you having problems with all 2.6.37 kernels.
Sordon - 13.01.2011, 18:11
Post subject:
Looking at the changelog it seems to be that with kernel 2.6.37-0.slh.5 the problem is fixed. Thanks slh
slh - 13.01.2011, 20:46
Post subject:
2.6.37-0.slh.5-aptosid-{686,amd64} might indeed help with this issue. Unfortunately my i830, i945GME and i945GZ chipsets are not affected by this, which makes debugging almost impossible.
sx9 - 13.01.2011, 20:53
Post subject:
      Quote:

Unfortunately my i830, i945GME and i945GZ chipsets are not affected by this, which makes debugging almost impossible.


whoa! Have you also made (inofficial) kernels for those architectures?
qord - 14.01.2011, 11:57
Post subject:
      slh wrote:
2.6.37-0.slh.5-aptosid-{686,amd64} might indeed help with this issue. Unfortunately my i830, i945GME and i945GZ chipsets are not affected by this, which makes debugging almost impossible.


I'll check with my netbook (apparently with Intel GMA 3150 chipset) and the newest kernel this weekend...

-cord
Sordon - 14.01.2011, 21:14
Post subject:
I installed kernel 2.6.37-0.slh.6 and the problem is solved Very Happy
dpdt1 - 16.01.2011, 17:01
Post subject:
i still get those messages on boot :
      Quote:
Jan 16 15:01:37 freedom kernel: [ 6.683358] [drm:intel_panel_get_max_backlight] *ERROR* fixme: max PWM is zero.


and i dont know if it is related, but system doesn't shutdown properly ever since the 2.6.37 kernel. at first it was a few times, but now this is default behaviour.
after the
      Quote:
will now halt

message, system freezes.

infobash -v :
      Quote:
# infobash -v
Host/Kernel/OS "freedom" running Linux 2.6.37-0.slh.6-aptosid-amd64 x86_64 [ Debian GNU/Linux 6.0 ]
CPU Info (1) Intel Core2 Duo T7250 @ clocked at [ 2001.000 MHz ]
(2) Intel Core2 Duo T7250 @ clocked at [ 2001.000 MHz ]
Videocard Intel Mobile GM965/GL960 Integrated Graphics Controller X.Org 1.7.7 [ 1280x800@60.0hz ]
Processes 137 | Uptime 4:01 | Memory 928.4/3014.0MB | HDD Size 250GB (71%used) | Client Shell | Infobash v3.34

qord - 17.01.2011, 21:12
Post subject:
      qord wrote:
      slh wrote:
2.6.37-0.slh.5-aptosid-{686,amd64} might indeed help with this issue. Unfortunately my i830, i945GME and i945GZ chipsets are not affected by this, which makes debugging almost impossible.


I'll check with my netbook (apparently with Intel GMA 3150 chipset) and the newest kernel this weekend...


It's fixed with the new kernel Smile

-cord
zent - 30.01.2011, 18:11
Post subject:
Hey! new here Smile

Im experiencing the same issue, and not solved for me Sad (with slh.14)......
anyone experiencig the same?!!?

-Sorry for my english. Smile

      Code:
Host/Kernel/OS  "aptonet" running Linux 2.6.37-0.slh.14-aptosid-686 i686 [ aptosid 2010-03 Ἀπάτη - kde-lite - (201012262151) ]
CPU Info        (1) Intel Core2 Duo T5670 @ clocked at [ 1800.000 MHz ]
                (2) Intel Core2 Duo T5670 @ clocked at [ 1801.000 MHz ]
Videocard       Intel Mobile 4 Series Chipset Integrated Graphics Controller  X.Org 1.7.7  [ 1280x800@60.0hz ]
Processes 135 | Uptime 1:22 | Memory 1295.3/1991.8MB | HDD Size 160GB (61%used) | Client Shell | Infobash v3.34

zent - 31.01.2011, 17:09
Post subject: more info
more info...
Still having same problem with slh.15 Sad.
and after looking the system logs i found more 'errors' that i think must be related...2011-01-
      Code:
kernel   [ 3331.440501] [drm:i915_gem_object_bind_to_gtt] *ERROR* Attempting to bind a purgeable object

and
      Code:
kernel   [ 3439.651214] [drm:i915_gem_mmap_gtt_ioctl] *ERROR* Attempting to mmap a purgeable buffer

anyone experiencing the same????
thanks in advance and sorry for my english Smile
saskwatch - 31.01.2011, 17:52
Post subject:
2.6.37-0.slh.14-aptosid-amd64 has this bug on my dual core
Acer Aspire dual core 1410-2817:

00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) (prog-if 00 [VGA controller])
Subsystem: Acer Incorporated [ALI] Device 029b
Flags: bus master, fast devsel, latency 0, IRQ 42
Memory at 90000000 (64-bit, non-prefetchable) [size=4M]
Memory at 80000000 (64-bit, prefetchable) [size=256M]
I/O ports at 30d0 [size=8]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 3
Kernel driver in use: i915

falling back to using 2.6.37-0.slh.11-aptosid-amd64 until
greater minds than mine have this sorted out.
Surprised
alexf - 04.02.2011, 06:58
Post subject:
Hi.

I got now this problem after upgrade today to Linux 2.6.37-0.slh.18-aptosid-amd64.
I can now choose maximum or lowest display brightness on my laptop.

Host/Kernel/OS "butterfly" running Linux 2.6.37-0.slh.18-aptosid-amd64 x86_64 [ aptosid 2010-02 Κῆρες - kde-full - (201009132215) ]
CPU Info Intel Core2 Solo U3500 @ clocked at [ 1400.000 MHz ]
Videocard Intel Mobile 4 Series Chipset Integrated Graphics Controller X.Org 1.7.7 [ 1366x768@60.0hz ]

Thank you.
moose - 13.02.2011, 22:43
Post subject:
I'm also affected by this bug on my thinkpad. I only have maximum and 0 brightness avialable, and unplugging the power cord autmatically switches to 0 brightness rendering my laptop unusable.

      Quote:
System: Host ponya Kernel 2.6.37-0.slh.18-aptosid-amd64 x86_64 (64 bit) Distro Debian GNU/Linux 6.0
CPU: Dual core Intel Core2 Duo L7500 (-MCP-) clocked at 800.00 MHz
Graphics: Card Intel Mobile GM965/GL960 Integrated Graphics Controller X.Org 1.7.7 Res: 1024x768@50.0hz
GLX Renderer Mesa DRI Intel 965GM GEM 20091221 2009Q4 GLX Version 2.1 Mesa 7.7.1
Disks: HDD Total Size: 160.0GB (65.7% used)
Info: Processes 145 Uptime 44 min Memory 639.9/1972.3MB Client Shell inxi 1.4.23


Thinkpad-acpi seems to get it right with a max brightness of 8 but /sys/class/backlight/acpi_video0/max_brightness is set to 15.

      Quote:

thinkpad_acpi: ThinkPad ACPI Extras v0.24
thinkpad_acpi: ThinkPad BIOS 7NETB7WW (2.17 ), EC 7MHT25WW-1.03
thinkpad_acpi: Lenovo ThinkPad X61s, model 7669A32
thinkpad_acpi: detected a 8-level brightness capable ThinkPad
thinkpad_acpi: Standard ACPI backlight interface available, not loading native one.


Can someone point me to documentation explaining how to downgrade kernel to 2.6.36 ?
wjw - 14.02.2011, 08:11
Post subject:
Hi,
maybe there are similarities to http://www.aptosid.com/index.php?name=P ... amp;t=743.
At least I (Laptop Asus ul30a with Intel graphics and aptosid-amd64) had a comparable issue since 2.6.37-0.slh.14 and traced it to some patch to drm/i915/panel. After un-applying it in 2.6.37-0.slh.23 it seemed o.k. for me.
Regards Wolfgang
moose - 14.02.2011, 13:15
Post subject:
Which patch is the culprit? Seeking through the 2.6.37-23/debian/patches directories wasn't enough to corner it.

Also, what is the process to unapply a patch ?
wjw - 14.02.2011, 20:11
Post subject:
The patch I meant was debian/patches/candidate/0147-drm-i915-panel-Fix-application-of-legacy-backlight-v.patch.
I found it by reading the changelog for 2.6.37-13.
To "un-apply" it (probably not the real terminus) I used "cat /path-to/0147-drm*patch | patch -p1" in the linux source directory and allowe "reversed". Hope it helps.
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