Bug 36114 - Dimming Laptop LCD causes buzz
Summary: Dimming Laptop LCD causes buzz
Status: RESOLVED INVALID
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/nouveau (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Nouveau Project
QA Contact: Xorg Project Team
URL:
Whiteboard: 2011BRB_Reviewed
Keywords:
Depends on:
Blocks:
 
Reported: 2011-04-10 07:04 UTC by geeksanonymouse
Modified: 2015-05-08 05:30 UTC (History)
0 users

See Also:
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Attachments

Description geeksanonymouse 2011-04-10 07:04:11 UTC 
Vaio F11: i7-720 QM, Nvidia GT330m
OS: Arch Linux, openSuse 11.4

When X is running, if I dim my screen by changing the value in /sys/devices/virtual/backlight/acpi_video0/brightness my LCD emits a high pitched buzz. I boot up to a terminal and I can change the brightness without getting the buzz. However, when X is running, I get the buzz.
The buzz does not occur in Windows 7 with any brightness setting. 

Steps to reproduce:
Boot up Linux distro to terminal.
sudo vi /sys/devices/virtual/backlight/acpi_video0/brightness
    change 8 to anything lower than 8 but greater than 0
Screen dims, no buzz.
Reset brightness to 8.
startx
Change brightness to less than 8.
Listen to buzz.
Comment 1 Ilia Mirkin 2015-05-08 05:30:27 UTC 
This bug is many years old. Closing, as there has been no activity. Feel free to reopen if this still happens with recent software versions, make sure to include logs.

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