Public bug reported:
Since the upgrade to kernel 3.13.0-35 (from 3.13.0-34), the screen is very dark
to the point it's unusable.
Backlight seems completely turned off. Using the brightness keys doesn't help.
It was working fine with 3.13.0-34.
I found that the offending patch is "drm/radeon: set default bl level to
something reasonable".
I reverted this patch and recompiled 3.13.0-35, and it solved the problem.
---
ApportVersion: 2.14.1-0ubuntu3.3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC2: greg 1962 F.... pulseaudio
/dev/snd/pcmC2D0p: greg 1962 F...m pulseaudio
/dev/snd/controlC1: greg 1962 F.... pulseaudio
/dev/snd/controlC0: greg 1962 F.... pulseaudio
CurrentDesktop: KDE
DistroRelease: Ubuntu 14.04
HibernationDevice: RESUME=UUID=fa1d286a-7f50-4e1f-ae6c-9d48161e6c2d
InstallationDate: Installed on 2010-07-03 (1521 days ago)
InstallationMedia: Kubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100427)
MachineType: FUJITSU SIEMENS AMILO Xi 2550
Package: linux (not installed)
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-35-generic
root=UUID=7b8ed785-f136-4231-b6bd-5e175a9aef0b ro processor.max_cstate=1
radeon.dpm=1 quiet splash crashkernel=384M-:128M vt.handoff=7
ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
RelatedPackageVersions:
linux-restricted-modules-3.13.0-35-generic N/A
linux-backports-modules-3.13.0-35-generic N/A
linux-firmware 1.127.5
Tags: trusty
Uname: Linux 3.13.0-35-generic x86_64
UpgradeStatus: Upgraded to trusty on 2014-05-08 (116 days ago)
UserGroups: adm admin bluetooth cdrom dialout lpadmin plugdev sambashare
vboxusers wireshark
_MarkForUpload: True
dmi.bios.date: 09/30/2008
dmi.bios.vendor: Phoenix
dmi.bios.version: 1.15
dmi.board.name: F44
dmi.board.vendor: FUJITSU SIEMENS
dmi.board.version: 00030D005503B103
dmi.chassis.type: 10
dmi.chassis.vendor: FUJITSU SIEMENS
dmi.modalias:
dmi:bvnPhoenix:bvr1.15:bd09/30/2008:svnFUJITSUSIEMENS:pnAMILOXi2550:pvr:rvnFUJITSUSIEMENS:rnF44:rvr00030D005503B103:cvnFUJITSUSIEMENS:ct10:cvr:
dmi.product.name: AMILO Xi 2550
dmi.sys.vendor: FUJITSU SIEMENS
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: apport-collected trusty
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https://bugs.launchpad.net/bugs/1364148
Title:
Backlight turned off since upgrade to 3.13.0-35
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