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Old 10-27-2012, 06:43 AM   #1
iron_net
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Onboard graphic driver for Intel GMA 4500MHD


Hi, I use an Acer TravelMate 5735Z with an onboard graphic chip called Intel GMA 4500MHD. I have installed Ubuntu 12.04 but when the graphical surface starts the screen backlight turns off. I got the tip to start grub with the option "asci_backlight=vendor" but that doesn't help. I also tried some alternative package sources for drivers but then Xserver doesn't seem to start at all (It actually does but I only get the error message "Your system is running in low-graphics mode" and a dialogue that eventually leads me to the shell). The only possibility to get the computer started with Ubuntu is over the recovery mode that uses the VESA graphic driver which doesn't provide the right screen solution and apparently causes serious problems like blinking cursors.

Can somebody give me some substantial instructions how to solve my problem either with the installation of an alternative driver or by starting Ubuntu with special options that allow me to adjust the backlight normally!?
 
Old 10-27-2012, 07:28 PM   #2
macemoneta
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The option is misspelled. It should be:
Code:
acpi_backlight=vendor
You may also need the additional options:
Code:
acpi_osi=Linux  acer_wmi.blacklist=yes

Last edited by macemoneta; 10-27-2012 at 07:30 PM.
 
Old 11-05-2012, 12:25 PM   #3
iron_net
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Sorry for the typo, I did use the right option and also tried "acpi_osi=Linux" in addition. What does "acer_wmi.blacklist=yes" exactly do?
 
Old 11-05-2012, 12:38 PM   #4
macemoneta
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"acer_wmi.blacklist=yes" prevents the acer_wmi kernel module from loading. It's function is:

Code:
# modinfo acer_wmi | grep "description:"
description:    Acer Laptop WMI Extras Driver
WMI is described here. It provides an interface between the device specific hardware and the management functions that use the hardware. The problem is that manufacturers are inconsistent in their implementation for a given brand, and so sometimes the WMI driver can cause problems.
 
  


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