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
This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:
apport-collect 1250051
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.