Red Hat Bugzilla – Bug 500936
Laptop LCD brightness set to 50% on boot, regardless of AC power presence
Last modified: 2014-06-16 09:36:32 EDT
Description of problem:
Udev sets laptop LCD brightness to 50% on startup, regardless of AC power presence.
Version-Release number of selected component (if applicable):
Start Fedora up on a laptop, the LCD panel goes to 50% brightness upon startup.
Even with AC power connected, panel is dimmed and must be set to full brightness EVERY TIME it boots.
Check if there's AC power present, and dim the panel in case it isn't. Or just do nothing, and wait for Gnome or KDE to do it.
Laptop model is Acer Aspire 6930G. x86_64 kernel. Udev version 141-3.fc11. Kernel 18.104.22.168-140.fc11.
udev does not set anything related to this. This is either the kernel default, or some HAL mechanism sets it.
Is it set at 50% as soon as Linux is booting, or only when gnome logs in?
As soon as it boots! I removed "quiet" from the kernel command line and it happens immediately after the udev service starts.
udev might load a kernel module, which then sets the initial value
ipv6 290112 32
cpufreq_ondemand 7696 2
acpi_cpufreq 9832 0
freq_table 4816 2 cpufreq_ondemand,acpi_cpufreq
fuse 57904 4
dm_multipath 16168 0
uinput 8704 0
arc4 2080 2
ecb 3184 2
uvcvideo 57180 0
snd_hda_codec_nvhdmi 3536 1
videodev 38704 1 uvcvideo
snd_hda_codec_realtek 265044 1
v4l1_compat 13076 2 uvcvideo,videodev
iwlagn 149764 0
iwlcore 135652 1 iwlagn
snd_hda_intel 29000 2
v4l2_compat_ioctl32 10480 1 videodev
lib80211 6356 1 iwlcore
snd_hda_codec 65376 3 snd_hda_codec_nvhdmi,snd_hda_codec_realtek,snd_hda_intel
mac80211 199552 2 iwlagn,iwlcore
usb_storage 101472 0
snd_hwdep 8600 1 snd_hda_codec
snd_pcm 79960 2 snd_hda_intel,snd_hda_codec
snd_timer 22496 1 snd_pcm
iTCO_wdt 13120 0
video 21436 0
joydev 11584 0
atl1e 33876 0
iTCO_vendor_support 3476 1 iTCO_wdt
acer_wmi 17464 0
snd 65096 10 snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_timer
i2c_i801 10064 0
serio_raw 6228 0
pcspkr 2848 0
wmi 7120 1 acer_wmi
soundcore 7024 1 snd
output 3184 1 video
cfg80211 37024 3 iwlagn,iwlcore,mac80211
snd_page_alloc 9216 2 snd_hda_intel,snd_pcm
xts 3600 1
gf128mul 7456 1 xts
aes_x86_64 8144 2
aes_generic 27648 1 aes_x86_64
dm_crypt 13000 1
nouveau 470464 2
drm 205900 2 nouveau
i2c_algo_bit 5972 1 nouveau
i2c_core 22240 4 i2c_i801,nouveau,drm,i2c_algo_bit
This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle.
Changing version to '11'.
More information and reason for this action is here:
Have you tried with the latest hal package in Fedora 11 or tried Rawhide? In
either case, can you let us know whether the issue is still happening, and give
the current version of the HAL packages you're using?
Fedora Bugzappers volunteer triage team
seem to be using:
havent tried rawhide.
hmm, the wierd part is that a later version of the 'same' make/model machine doenst have the problem (same version of hal but doesnt have hal-devel installed....i havent tried removing this on broken one because dont remember why its there).
seems to have problems with fc12alpha x86_64 livecd ( 11.91 ) i downloaded like
when booting it gives me:
"[drm: radeon_driver_load_kms] *ERROR* failed to initialize radeon disabling
ok i still have the forgetful brightness meter problem on one machine with
now a duplicate machine that had not experienced the problem with fc11 is now
having the forgetfulness problem since i installed fc12 on it last week.
the good news being that as of the fc12 install last week the '[drm: radeon_driver_load_kms]' error is gone.
although brightness doenst work right at least have one less error message.
This message is a reminder that Fedora 11 is nearing its end of life.
Approximately 30 (thirty) days from now Fedora will stop maintaining
and issuing updates for Fedora 11. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as WONTFIX if it remains open with a Fedora
'version' of '11'.
Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version'
to a later Fedora version prior to Fedora 11's end of life.
Bug Reporter: Thank you for reporting this issue and we are sorry that
we may not be able to fix it before Fedora 11 is end of life. If you
would still like to see this bug fixed and are able to reproduce it
against a later version of Fedora please change the 'version' of this
bug to the applicable version. If you are unable to change the version,
please add a comment here and someone will do it for you.
Although we aim to fix as many bugs as possible during every release's
lifetime, sometimes those efforts are overtaken by events. Often a
more recent Fedora release includes newer upstream software that fixes
bugs or makes them obsolete.
The process we are following is described here:
still doesnt work.
please change the version to fc12
Fedora 11 changed to end-of-life (EOL) status on 2010-06-25. Fedora 11 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.
If you can reproduce this bug against a currently maintained version of
Fedora please feel free to reopen this bug against that version.
Thank you for reporting this bug and we are sorry it could not be fixed.
Just posting this in the hopes of getting Bugzilla off my back for this 5 year old report...