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mooseOffline
Post subject:   PostPosted: 13.02.2011, 22:43



Joined: 2011-02-12
Posts: 23

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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 ?
 
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wjwOffline
Post subject:   PostPosted: 14.02.2011, 08:11



Joined: 2011-02-14
Posts: 3
Location: Poppenlauer
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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
 
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mooseOffline
Post subject:   PostPosted: 14.02.2011, 13:15



Joined: 2011-02-12
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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 ?
 
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wjwOffline
Post subject:   PostPosted: 14.02.2011, 20:11



Joined: 2011-02-14
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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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