The patch you referred to is available in the upstream 3.11-rc5 kernel:
author Jani Nikula 2013-07-25
committer Daniel Vetter 2013-08-07
commit 3f577573cd5482a32f85bd131e52f7cb4b9ac518
tree 87c7eee0318624bbf90bf318646d0d5471bb41b2
parent 3eaba51cd399f5362a9fd9ebd5fb8b625b454271
drm/i915: do not disable backlight on vgaswitcheroo switch off
On muxed systems, the other vgaswitcheroo client may depend on i915 to
handle the backlight. We began switching off the backlight since
commit a261b246ebd552fd5d5a8ed84cc931bb821c427f
Author: Daniel Vetter
Date: Thu Jul 26 19:21:47 2012
drm/i915: disable all crtcs at suspend time
breaking backlight on discreet graphics in (some) muxed systems.
Keep the backlight on when the state is changed through vgaswitcheroo.
Note: The alternative would be to add a quirk table to achieve the same
based on system identifiers, but AFAICS it would asymptotically approach
effectively the same as this patch as more IDs are added, but with the
maintenance burden of the quirk table.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=55311
Tested-by: Fede
Tested-by: Aximab
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=59785
Tested-by: sfievet
Signed-off-by: Jani Nikula
Cc: stable
Signed-off-by: Daniel Vetter
** Bug watch added: freedesktop.org Bugzilla #59785
https://bugs.freedesktop.org/show_bug.cgi?id=59785
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1163418
Title:
Backlight is off when switching to discrete AMD GPU using
vga_switcheroo and can't be turned on
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1163418/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
