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bakery_lurker 04-01-2012 05:38 PM

No backlight control on Lenovo Ideapad Z570 linux 2.6.37.6
 
For the last week or so I have been bashing my brains out against the following problem. I have a new Z570 Lenovo Ideapad running Slackware64 2.6.37.6, the stock kernel. There appears to be no way to modulate the backlight brightness. I apologize in advance if all these settings are a big mess. As a newbie, I am pretty much capable only of acting like a monkey and running commands I find on LQ.

Currently my WM is KDE4. The function keys do work controlling sound, but using them to increase or decrease lcd light presents a notification with a screen icon and an empty slider and does nothing.

acpi_listen reveals that they keys attempt:
video DD02 00000086 00000000
video DD02 00000087 00000000

Simultaneously, the following appears in /var/log/messages:
Apr 1 22:18:14 sprocket logger: ACPI group video / action DD02 is not defined

/proc/acpi/ contains no 'video/' only-
ac_adapter battery button event processor wakeup

Also, the directory-
/sys/class/backlight/ is empty

Quote:

$ xbacklight
No outputs have backlight property
So, it seems there is no device for the acpi controls to send commands to. I read somewhere that if the video/ dir did not exist, running #mdprobe video would make it automagically appear, but this is not the case.

/etc/laptop-mode/conf.d/lcd-brightness.conf

Here are my loaded modules:
Quote:

bash-4.1# lsmod
Module Size Used by
cpufreq_stats 3889 0
snd_seq_dummy 1479 0
snd_seq_oss 30116 0
snd_seq_midi_event 5708 1 snd_seq_oss
snd_seq 52486 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event
snd_seq_device 5473 3 snd_seq_dummy,snd_seq_oss,snd_seq
snd_pcm_oss 40089 0
snd_mixer_oss 17282 1 snd_pcm_oss
appletalk 27313 0
psnap 2053 1 appletalk
llc 3784 1 psnap
ipv6 275315 26
pcmcia 37397 0
pcmcia_core 12125 1 pcmcia
cpufreq_ondemand 9164 8
acpi_cpufreq 6079 0
freq_table 2435 3 cpufreq_stats,cpufreq_ondemand,acpi_cpufreq
mperf 1195 1 acpi_cpufreq
ppdev 6021 0
lp 9781 0
parport_pc 21214 0
parport 30087 3 ppdev,lp,parport_pc
nvram 5821 0
fan 2506 0
fuse 66651 3
snd_hda_codec_hdmi 22985 1
snd_hda_codec_realtek 293594 1
i915 400238 2
iwlagn 188201 0
snd_hda_intel 21915 5
iwlcore 55893 1 iwlagn
drm_kms_helper 27035 1 i915
snd_hda_codec 71748 3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel
joydev 10279 0
snd_hwdep 6254 1 snd_hda_codec
snd_pcm 73762 5 snd_pcm_oss,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
drm 177345 3 i915,drm_kms_helper
mac80211 204017 2 iwlagn,iwlcore
r8169 37529 0
uvcvideo 62696 0
i2c_algo_bit 5055 1 i915
videodev 65968 1 uvcvideo
btusb 11689 0
bluetooth 53772 1 btusb
snd_timer 19671 3 snd_seq,snd_pcm
cfg80211 142106 3 iwlagn,iwlcore,mac80211
psmouse 47222 0
processor 25982 1 acpi_cpufreq
video 11949 1 i915
snd 58334 20 snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer_oss,snd_hda_codec_hdmi,snd_hda_codec_realte k,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_timer
soundcore 5681 1 snd
intel_agp 10824 1 i915
mii 3906 1 r8169
snd_page_alloc 7297 2 snd_hda_intel,snd_pcm
v4l1_compat 15658 2 uvcvideo,videodev
intel_gtt 14862 3 i915,intel_agp
shpchp 26821 0
serio_raw 4534 0
evdev 9813 15
sg 26495 0
battery 10535 0
thermal 8082 0
thermal_sys 13862 4 fan,processor,video,thermal
agpgart 28874 3 drm,intel_agp,intel_gtt
output 2020 1 video
ideapad_laptop 4262 0
rtc_cmos 9374 0
rtc_core 14471 1 rtc_cmos
rtc_lib 1978 1 rtc_core
button 5013 1 i915
ac 3249 0
rfkill 16442 3 bluetooth,cfg80211,ideapad_laptop
v4l2_compat_ioctl32 11199 1 videodev
i2c_i801 8230 0
hwmon 1473 1 thermal_sys
i2c_core 19769 6 i915,drm_kms_helper,drm,i2c_algo_bit,videodev,i2c_i801
Thanks in advance!

-Bakery Lurker


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