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Old 05-27-2010, 01:06 AM   #1
mmoustafa
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Lenovo x61s monitor brightness - Centos 5.4


Hi Pros,

I installed Centos 5.4 on my X61S lenovo laptop. it's great but I have a problem with the lcd brightness. brightness control buttons work fine up and down, but the highest level of brightness still quite dark. any solution about how to fix this. on other operating systems the monitor is working fine.

Thanks
 
Old 05-27-2010, 11:05 AM   #2
business_kid
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I have a directory /sys/devices/virtual/backlight/acpi_video0/ with brightness files in there.
try modifying ones root can write to. On my HP box,
ech0 10 > /sys/devices/virtual/backlight/acpi_video0/brightness
does it.
 
Old 05-27-2010, 11:41 AM   #3
mmoustafa
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still not workind

Thanks, the file for me is in the pat: /proc/acpi/ibm/brightness, I tried to echo into it but I receive an error:

[root@localhost ibm]# more brightness
level: 7
commands: up, down
commands: level <level> (<level> is 0-15)
[root@localhost ibm]# echo 10 > brightness
bash: echo: write error: Invalid argument
[root@localhost ibm]#

and when I edited the line (removed spaces before and after <)
[root@localhost ibm]# echo 10>brightness

[root@localhost ibm]# more brightness
level: 7
commands: up, down
commands: level <level> (<level> is 0-15)
[root@localhost ibm]#

still didn't change, the ll output is below may be the file is protected.

-rw-r--r-- 1 root root 0 May 27 17:38 brightness

any idea about that?
 
Old 05-28-2010, 04:22 AM   #4
business_kid
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Have you write permissions on that file? Are you sure there's nothing in /sys?

Most oif these files are informational and read only.
 
Old 05-28-2010, 04:51 AM   #5
mmoustafa
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still :)

there is no files in /sys/ regarding this issue, I even searched "find / -name brightness" and found the file as I posted previously.

Currently after I did echo 15 > brightness and reloaded the machine, the value in the file is 15 but the brightness still did not change. Still dark. could it be a driver problem ?
 
Old 05-28-2010, 06:08 AM   #6
mmoustafa
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Solved :d

dear all,

I found a solution to manually put the brightness up and down.

echo "up" > /proc/acpi/ibm/brightness,

rather than using number values use "up" and "down"
 
  


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