Red Hat Bugzilla – Bug 771351
Acer eMachines e525 laptop has backlight off
Last modified: 2012-10-23 10:02:51 EDT
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20111012 Firefox/7.0.1 SeaMonkey/2.4.1
I have an eMachines e525 and FC14 ran properly out of the box with the screen at 1366×768. With FC16 the screen resolution is fixed at 1024x768, everything looks squat and Gnome3 only runs in fallback mode.
Steps to Reproduce:
1. Boot F16
2. Log in
Screen resolution is 1024x768. Gnome in fallback mode.
Screen resolution is 1366×768. Gnome works
The e525 has the Intel Mobile 4 Series Chipset Integrated Graphics Controller
Here is the xrandr from F14:
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192
LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
800x600 60.3 56.2
VGA1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
Here is part of Xorg.0.log from F14:
[ 27.354] (II) Loading extension DRI2
[ 27.354] (==) Matched intel as autoconfigured driver 0
[ 27.354] (==) Matched vesa as autoconfigured driver 1
[ 27.354] (==) Matched fbdev as autoconfigured driver 2
[ 27.355] (==) Assigned the driver to the xf86ConfigLayout
[ 27.355] (II) LoadModule: "intel
With F16, vesa and VGA1 are used. (I will post the xrandr next time I retry F16.)
Ignore the previous post! I hadn't realised that if you do a basic video install an xorg.conf is created to ensure the use of the vesa driver. What I have here is the black screen problem. The brightness up and down controls change the brightness values in /sys/class/backlight/acpi_video0 but the X server never reflects them. I have this in dmesg:
[ 3.977219] wmi: Mapper loaded
[ 19.815699] acer_wmi: Acer Laptop ACPI-WMI Extras
[ 19.816614] acer_wmi: Function bitmap for Communication Device: 0x1
[ 19.816619] acer_wmi: Brightness must be controlled by generic video driver
If I do this:
setpci -s 00:02.0 F4.B=0
it turns the screen on until something dims it.
I am using the i915 driver for an Intel GM45 chipset.
Fedora 17 is no better.
*** This bug has been marked as a duplicate of bug 752727 ***