Created attachment 44492 [details] lsmod report I have a kinda old laptop. Just installed Ubuntu 10.10 Mavericks but I come across some problems. Most inportantly is the brightness control problem. My laptop has 8 levels adjustment settings. But only 4 levels can be adjust when I press Fn+F7 and FN+F8 to change to the maximum or minimum. I think this is a bug and wanna solve it, so I reported here. I used this command below to check the brightness levels info in the /proc/acpi/video/GFX0/DD03/brightness. cat '/proc/acpi/video/GFX0/DD03/brightness It returns these values below. levels: 13 25 38 50 63 75 88 100 current: 63 And I checked the /proc/acpi/video/GFX0/DD03/EDID, it's empty. Is this normal or Ubuntu hasn't recognized my laptop LCD correctly? I did dmesg|tail -5 command and it returns this below. [ 2025.850319] EXT4-fs (sda4): re-mounted. Opts: errors=remount-ro,commit=0 [ 2772.758260] ACPI: Please implement acpi_video_bus_ROM_seq_show [ 2772.937960] ACPI: Please implement acpi_video_bus_ROM_seq_show [ 2775.236182] ACPI: Please implement acpi_video_bus_ROM_seq_show [ 2785.830043] ACPI: Please implement acpi_video_bus_ROM_seq_show Ismod attached. Please help me make this amazing OS run flawlessly on my laptop. Thanks in advance.
The kernel in your distro is not very fresh, so to speak. Please report this problem to Ubuntu first.
(In reply to comment #1) > The kernel in your distro is not very fresh, so to speak. > > Please report this problem to Ubuntu first. I did. My kernel has been upgraded to 2.6.35-24-generic. The issue remains.
Will you please attach the output of acpidump on your box? Will you please try the /sys/class/backlight/*/brightness and see whether the brightness level can be adjusted? Thanks.
(In reply to comment #3) > Will you please attach the output of acpidump on your box? > > Will you please try the /sys/class/backlight/*/brightness and see whether the > brightness level can be adjusted? > > Thanks. Well Itried run this command but what it gives back this below. chan:~# /sys/class/backlight/*/brightness bash: /sys/class/backlight/acpi_video0/brightness: Permission denied
Does there exist the interface of /sys/class/backlight/*/brightness on your box? It will be great that you can attach the output of acpidump on your box. Thanks.
ping
Created attachment 47132 [details] acpidumps acpi dumps that might be helpful for this issue
(In reply to comment #5) > Does there exist the interface of /sys/class/backlight/*/brightness on your > box? > It will be great that you can attach the output of acpidump on your box. > Thanks. Hi, ykzhao. Thanks for replying and happy new year. Below is what responds to what u told me to run in terminal. bash: /sys/class/backlight/acpi_video0/brightness: Permission denied It appears system have denied to output the info about this. Regards alex
(In reply to comment #6) > ping I have been busy lately. happy new year, dude.
Hi, Happy New Year 2012!. :) Bug closed as there is no response for more than a year. Please feel free to reopen it if the problem still exists in the latest upstream kernel.