https://bugzilla.kernel.org/show_bug.cgi?id=38342
Summary: [Ironlake LVDS Vaio-Y i915] Backlight controls
ineffective
Product: ACPI
Version: 2.5
Kernel Version: 3.0-rc4
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
lspci -vv
Description of problem:
On my Sony Vaio Y, backlight controls are not operative, draining battery life.
System environment:
-- chipset: Arrandale Core i5 430UM, Ironlake integrated graphics.
(see lspci output)
-- Machine or mobo model: Sony Vaio VPC-Y2190X
-- Display connector: LVDS (see xrandr output)
Version-Release number of selected component (if applicable):
upstream kernel 3.0 rc4 (using the same config as Fedora's 3.0-0.rc4.git3.1)
and also:
kernel-2.6.38.8-32.fc15.x86_64
kernel-3.0-0.rc4.git3.1.fc16
libdrm-2.4.26-1.fc15.x86_64
mesa-dri-drivers-7.11-0.11.20110525.0.fc15.x86_64
xorg-x11-drv-intel-2.15.0-3.fc15.x86_64
xorg-x11-server-Xorg-1.10.2-1.fc15.x86_64
How reproducible:
Always
Steps to Reproduce:
1. Fn-F5 (reduce brightness) or Fn-F6 (increase brightness)
2. echo 1 > /sys/devices/virtual/backlight/acpi_video0/brightness
3. cat /sys/devices/virtual/backlight/acpi_video0/actual_brightness
4. setpci -s 00:02.0 F4.B=[two-digit-hex-value]
Actual results:
With the first three steps, the feedback indicates that brightness has indeed
been changed. However, the actual brightness remains at 100% throughout.
With setpci, lspci-ing the register always reads 00
Expected results:
Backlight brightness should change corresponding to the commands entered.
Additional info:
Also filed at bugs.freedesktop.org:
https://bugs.freedesktop.org/show_bug.cgi?id=34417
and Red Hat Bugzilla:
https://bugzilla.redhat.com/show_bug.cgi?id=689962
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