kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Marco Trevisan (Treviño), this bug was reported a while ago and there
hasn't been any activity in it recently. We were wondering if this is
still an issue? If so, could you please test for this with the latest
development release of Ubuntu? ISO images are available from
http://cdimage.ubuntu.com/daily-live/current/ .

If it remains an issue, could you please run the following command in
the development release from a Terminal
(Applications->Accessories->Terminal), as it will automatically gather
and attach updated debug information to this report:

apport-collect -p linux <replace-with-bug-number>

** Tags added: needs-kernel-logs needs-upstream-testing

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/955046

Title:
  Screen backlight is OFF when resuming from suspend with vgaswitcheroo
  controlled cards

Status in The Linux Kernel:
  Confirmed
Status in “linux” package in Ubuntu:
  Incomplete
Status in “pm-utils” package in Ubuntu:
  Confirmed

Bug description:
  Using vgaswitcheroo to disable the integrate or discrete card could
  lead to some troubles when resuming from suspension (to RAM or disk as
  well). Basically, the computer monitor backlight could be not be
  turned on again when resuming from suspension.

  To me it happens this:
   - I disable the integrated card
   - Suspend
   - Resume: no monitor backlight is on

  At this point doing what mentioned below fix the issue, but it must be done by SSH or by memory :):
    echo DIGD > /sys/kernel/debug/vgaswitcheroo/switch
    echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

  So, the easiest and clean fix should be to add a sleep.d script
  something like:

  #!/bin/sh

  if [ -e /sys/kernel/debug/vgaswitcheroo/switch ]; then
    case "$1" in
      hibernate|suspend)
        echo ON > /sys/kernel/debug/vgaswitcheroo/switch
        ;;
      thaw|resume)
        echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
        ;;
    esac
  fi

  This would fix the issue for vgaswitcheroo users and won't touch the
  others.

To manage notifications about this bug go to:
https://bugs.launchpad.net/linux/+bug/955046/+subscriptions