Backlight flickers when changing brightness due to changes in video.c

Bug #205261 reported by Matthew Garrett
10
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Fix Released
Medium
Ben Collins

Bug Description

The changes to video.c between 2.6.22 and 2.6.24 mean that the kernel and userland now both try to handle brightness changes simultaneously.

Revision history for this message
Matthew Garrett (mjg59) wrote :

This restores the gutsy behaviour.

Revision history for this message
Matthew Garrett (mjg59) wrote :
Revision history for this message
Ben Collins (ben-collins) wrote :

Thanks. Applied to git. Should show up in the pre-RC kernel upload.

Changed in linux:
assignee: nobody → ben-collins
importance: Undecided → Medium
milestone: none → ubuntu-8.04
status: New → Fix Committed
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package linux - 2.6.24-13.23

---------------
linux (2.6.24-13.23) hardy; urgency=low

  [Alessio Igor Bogani]

  * rt: Updated configuration files

  [Ben Collins]

  * openvz: New custom flavour for OpenVZ
  * config: Disable IDE AMD driver in favor of PATA version
    - LP: #181561
  * config: Disable IDE VIA driver in favor of PATA version
    - LP: #181561
  * drivers/video: Restore gutsy backlight dimming behavior
    - LP: #205261
  * build/config: Enable CONFIG_CIFS_WEAK_PW_HASH
    - LP: #202445

  [Colin Ian King]

  * SAUCE: Add support for version 4 of Chelsio NICs in cxgb3 driver
    - LP: #201893

  [Kees Cook]

  * AppArmor: re-add missing "type" field in syslog reports.
    - LP: #202888
  * kvm: reset TSS on x86_64 to avoid ioperm bitmap corruption
    - LP: #144900

  [Stefan Bader]

  * USB: EHCI: add separate IAA watchdog timer
    - LP: #198619
  * SAUCE: Always use SCO protocol (disable eSCO support)
    - LP: #39414
  * PM: Introduce PM_EVENT_HIBERNATE callback state
    - LP: #201086

  [Tim Gardner]

  * Disable DRM suspend/resume on pre-915 Intel chips
    - LP: #207496
  * frame buffer regression - screen blank except for blinking cursor after fbcon
    vtswitch
    - LP: #201591

 -- Tim Gardner <email address hidden> Wed, 19 Mar 2008 10:05:05 -0400

Changed in linux:
status: Fix Committed → Fix Released
Revision history for this message
George Mason (george-porthall) wrote :

Apologies for the thread hijack - could you please advise how I can apply this fix (video.diff) to a new Gutsy installation, to stop periodic brightness flickering of the LCD panel. I believe it's related to the issue described by Matthew Garrett above.

Thanks. George Mason. (george__at__porthall__dot__net)

Revision history for this message
AdvanceRacerGT (dakilaledesma) wrote :

What I just did (with the official karmic release) is just to stop the process of the gnome power manager, although this will take out the ability of making you computer sleep and stuff, then I just opened start up applications and and unticked the gnome power manager so that it won't open it on start up.

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