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Message #32111
[Bug 1250051] Re: [Lenovo G780] Backlight switched off at login screen
I hope this report wasnt completely in vain, but I reported before it was fixed, so I wouldn't know anyways.
Thanks for your time Christopher, at least I learnt a few things doing this
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https://bugs.launchpad.net/bugs/1250051
Title:
[Lenovo G780] Backlight switched off at login screen
Status in “linux” package in Ubuntu:
Triaged
Bug description:
Whenever I used to boot on ubuntu, my login screen was too dim, I
wouldn't know my computer was switched on until I increased the
brightness with my keyboard.
The problem is fixed going from http://kernel.ubuntu.com/~kernel-
ppa/mainline/v3.12.1-trusty/ to http://kernel.ubuntu.com/~kernel-
ppa/mainline/v3.12.2-trusty/ , specifically commit
2c62333a408f5badd2d2ffd7177f95deeccc5ca4 .
WORKAROUND: #!/bin/sh
cap_bright() {
[ ! -d "$1" ] && return
MAX=$(cat "$1/max_brightness")
echo $MAX > "$1/brightness"
}
cap_bright "/sys/class/backlight/acpi_video1"
cap_bright "/sys/class/backlight/intel_backlight"
---
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: danato 1777 F.... pulseaudio
CRDA:
country MO:
(2402 - 2482 @ 40), (N/A, 20)
(5170 - 5250 @ 40), (3, 23)
(5250 - 5330 @ 40), (3, 23), DFS
(5735 - 5835 @ 40), (3, 30)
DistroRelease: Ubuntu 13.10
InstallationDate: Installed on 2013-11-05 (5 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: LENOVO 20138
MarkForUpload: True
Package: linux (not installed)
ProcFB:
0 nouveaufb
1 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-13-generic root=UUID=be58180f-8d25-4719-a049-001ce96e4bb2 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
RelatedPackageVersions:
linux-restricted-modules-3.11.0-13-generic N/A
linux-backports-modules-3.11.0-13-generic N/A
linux-firmware 1.116
StagingDrivers: rts5139
Tags: saucy staging
Uname: Linux 3.11.0-13-generic x86_64
UpgradeStatus: Upgraded to saucy on 2013-11-06 (5 days ago)
UserGroups: adm cdrom dip lpadmin netdev plugdev sambashare sudo
dmi.bios.date: 12/19/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: 5ECN95WW(V9.00)
dmi.board.asset.tag: No Asset Tag
dmi.board.name: INVALID
dmi.board.vendor: LENOVO
dmi.board.version: 31900003WIN8 STD MLT
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo G780
dmi.modalias: dmi:bvnLENOVO:bvr5ECN95WW(V9.00):bd12/19/2012:svnLENOVO:pn20138:pvrLenovoG780:rvnLENOVO:rnINVALID:rvr31900003WIN8STDMLT:cvnLENOVO:ct10:cvrLenovoG780:
dmi.product.name: 20138
dmi.product.version: Lenovo G780
dmi.sys.vendor: LENOVO
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