Lenovo Y570 Brightness

B

BeautifulFish

Hi,

I am using HEAD and I have a problem with the screen brightness, it is always at maximum. I am using the Intel driver in x11-drivers/xf86-video-intel.

/etc/make.conf
Code: 
WITH_NEW_XORG
WITH_KMS

I tried the following with no result:

x11/xbrightness and x11/xcalib, they increase the black color, the screen maximum brightness is still on. Software illusion, not hardware.

Code: 
#kldload acpi_ibm
#kldload acpi_video

Code: 
#sysctl hw.acpi.video.lcd0.active=1
hw.acpi.video.lcd0.active: 0 -> 0
#sysctl hw.acpi.video.lcd0.brightness=30
hw.acpi.video.lcd0.brightness: 70 -> 30

Code: 
#xbacklight -set 50
No outputs have backlight property

xorg.conf
Code: 
Option "RegistryDwords" "EnableBrightnessControl=1"

Xorg.0.log
Code: 
(WW) intel(0): Option "RegistryDwords" is not used"

Also xev doesn't detect Fn+Up/Down which should change the LCD brightness.
 
If I recall correctly I only needed to add
Code: 
Option "RegistryDwords" "EnableBrightnessControl=1"
to xorg.conf. However my T510 is running on its nVidia adapter and the proprietary nvidia driver, so maybe that's the difference.

That's probably not very helpful, sorry!

sim
 
Thanks Sim, unfortunately it doesn't work.. I wish I could use the nvidia driver but this laptop uses Optimus Technology "2 graphics cards". nvidia driver causes it to restart. And I can't disable the intel graphics card from the BIOS.
 
Interesting, mine also has the Optimus, but in my case it is possible to disable it in the BIOS. Mine has two BIOS options - one appears to control whether the choice of device is delegated to the OS (fails), the other forces either the Intel or the nVidia option. If I don't force nVidia with the second option, I get the same symptoms you report.

sim
 
mmm waiting for a bios update can take a while. :(
Can this be helpful in any way? Maybe there is a way to control the level of the backlight brightness instead of just switching it on or off?
 
Gah! Just reinstalled on a replacement HD and now I can't get LCD brightness working again, despite checking the usual things (acpi_video, acpi_ibm, xorg.conf).

Ugly workaround - switch to the text console (Ctrl+Alt + F1) and you can use the brightness controls as normal, then switch back to the X console. (Something to do when your Mac friends aren't looking...)

sim
 
I am using 10.0-ALPHA5 now, and the LCD brightness is still hurting my eyes. Switching to the text console doesn't work for me with KMS.

Code: 
# kldstat
 6    1 0xffffffff812fa000 7480     acpi_video.ko
 7    1 0xffffffff81302000 6be8     acpi_ibm.ko
 8    1 0xffffffff81309000 d28      acpi_call.ko

# sysctl -a | grep video
hw.acpi.reset_video: 1
hw.acpi.video.crt0.active: 0
hw.acpi.video.lcd0.active: 0
hw.acpi.video.lcd0.brightness: 17
hw.acpi.video.lcd0.fullpower: 17
hw.acpi.video.lcd0.economy: 10
hw.acpi.video.lcd0.levels: 70 30 10 17 23 30 40 50 60 70 80 90 100
hw.acpi.video.ext0.active: 0
dev.acpi_video.0.%desc: ACPI video extension
dev.acpi_video.0.%driver: acpi_video
dev.acpi_video.0.%parent: vgapci0
dev.acpi_video.1.%desc: ACPI video extension
dev.acpi_video.1.%driver: acpi_video
dev.acpi_video.1.%parent: vgapci1

# sysctl -a | grep ibm
#

I can't convert DSL to AML:
Code: 
# iasl -tc 1.dsl

Intel ACPI Component Architecture
ASL Optimizing Compiler version 20130823-64
Copyright (c) 2000 - 2013 Intel Corporation

Compiler aborting due to parser-detected syntax error(s)
1.dsl     13353:         Package (0x06)
Error    6126 -             ^ syntax error

ASL Input:     1.dsl - 13373 lines, 423692 bytes, 5268 keywords
Hex Dump:      1.hex - 199 bytes

Compilation complete. 1 Errors, 0 Warnings, 0 Remarks, 0 Optimizations

1.dsl uploaded to ZeroBin. http://sebsauvage.net/paste/?d2df3b8bcd86e41f#7Jq9VWOe82Jp1KpdMxK9tJDTXavFzEU1YV2KGpqakg8=
 
Hi @BeautifulFish,

I found sysutils/acpi_call helpful with screen brightness settings on a ThinkPad T430s. After loading the kernel module, I run the following e.g. acpi_call -p '\VBRC' -i [i]N[/i], where N is between 0-16.

I couldn't get acpi_video or acpi_ibm to work with this hardware.

I hope this is helpful.

Cheers,
CoB
 
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