Regression (10.10): Unable to adjust screen brightness on recent Sony Vaio notebooks, Intel GMA adapter
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Fix Released
|
Medium
|
Unassigned | ||
linux-source-2.6.22 (Ubuntu) |
Won't Fix
|
Undecided
|
Unassigned | ||
xbacklight (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned |
Bug Description
Fn keys don't work for dimming the screen, though they do stimulate the sonybright.sh script.
xbacklight works if the notebook has an Intel 965 (x3100) display adapter, but is subject to bug #176888 (won't work on Hardy, bad XRandR setting).
See bug #95444 for a hack to nvclock which makes it possible to control backlight on nVidia 8 series adapters (SPEED mode on the SZ650).
There are 2 problems here:
1) The Vaio's LED screen is really very bright when burning at 100% and is hard to look at for any period
2) Battery life suffers
Pretty much all the newer Vaios (2007 onwards) have some combination of these graphics adapters so this bug should be widespread (and much appreciated when fixed!). A couple of script solutions have been proposed in this bug report; please feel free to hack and make suggestions.
One solution for notebooks with Intel 965 display adapters is to install xbacklight:
]$ sudo apt-get install xbacklight
Then add these 2 lines to /etc/rc.local (or just execute from the command line):
xrandr --output LVDS --set BACKLIGHT_CONTROL native
/etc/init.d/acpid restart
And edit /etc/acpi/
#!/bin/bash
if [ "x$1" = "xdown" ]; then
xbacklight -time 100 -steps 10 -dec 10 2>/tmp/
elif [ "x$1" = "xup" ]; then
xbacklight -time 100 -steps 10 -inc 10 2>/tmp/
else
echo >&2 Unknown argument $1
fi
Please note that this will not affect brightness on nVidia 8 series adapters, just Intel adapters.
Backlight on nVidia adapters is being dealt with in bug #95444, to separate this report from the nVidia report.
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
AplayDevices:
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xfc500000 irq 48'
Mixer name : 'SigmaTel STAC9872AK'
Components : 'HDA:83847662,
Controls : 11
Simple ctrls : 7
DistroRelease: Ubuntu 10.10
HibernationDevice: RESUME=
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha amd64 (20100412)
MachineType: Sony Corporation VGN-SZ650N
Package: linux (not installed)
PccardctlIdent:
Socket 0:
no product info available
PccardctlStatus:
Socket 0:
no card
ProcCmdLine: BOOT_IMAGE=
ProcEnviron:
PATH=(custom, no user)
LANG=en_GB.utf8
SHELL=/bin/bash
ProcVersionSign
Regression: Yes
RelatedPackageV
Reproducible: Yes
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
Tags: maverick kernel-graphics regression-release needs-upstream-
Uname: Linux 2.6.35-22-generic x86_64
UserGroups:
dmi.bios.date: 04/04/2008
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: R0122S5
dmi.board.
dmi.board.name: VAIO
dmi.board.vendor: Sony Corporation
dmi.board.version: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.
dmi.modalias: dmi:bvnPhoenixT
dmi.product.name: VGN-SZ650N
dmi.product.
dmi.sys.vendor: Sony Corporation
Changed in linux: | |
assignee: | nobody → ubuntu-kernel-team |
importance: | Undecided → Medium |
status: | Incomplete → Triaged |
description: | updated |
description: | updated |
description: | updated |
Changed in linux: | |
status: | Triaged → Fix Released |
Changed in linux: | |
status: | Fix Released → In Progress |
description: | updated |
description: | updated |
description: | updated |
Changed in xbacklight: | |
status: | New → Fix Released |
Changed in linux (Ubuntu): | |
status: | Fix Released → New |
summary: |
- Unable to adjust screen brightness on recent Sony Vaio notebooks, Intel - GMA adapter + Regression (10.10): Unable to adjust screen brightness on recent Sony + Vaio notebooks, Intel GMA adapter |
This big is still present and identical in Hardy Heron (today's Live CD)