matrix backlight problem

[nyslay]

Hello.
I have a problem when installing Sabayon 5.5 (or updating 5.4 to 5.5)
After a successful recording of a DVD system, after some time the system was booting, the matrix baclight turn off(The matte screen), and I see nothing, because everything is dark.
This problem occurs on the Linux kernel in version 2.6.37 and later.
This problem occurs for me in all systems, with kernel 2.6.37 and later.
This problem also occurs when I updating older versions of the system, those with the kernel 2.6.37 and later.
This problem occurs on a laptop: Acer eMachines e725 ( ftp://ftp.emachines.com/notebook/E725/M ... G_0223.pdf ).
Graphics Card: Intel® Graphics Media Accelerator 4500M

Sorry for my English.
Sorry if the subject is in a bad section.
Please help.

[Fitzcarraldo]

Post the output of the command lspci

If you have the module acer_wmi then see what happens if you unload the module:

Code: Select all

$ su
Password: <--- Enter the root user's password.
# rmmod acer_wmi
# exit
$

That module is used to change the brightness of the backlight, but may not be working correctly on your model of Acer laptop.

If the problem is indeed caused by the acer_wmi module then you can blacklist it.

[nyslay]

Ok, but now I use Chakra with kernel 2.6.35, and I would come back to Sabayon.
lspci on Chakra:

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[nyslay@chakra ~]$ lspci
00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 09)
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09)
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09)
00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03)
00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 (rev 03)
00:1c.2 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 3 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03)
00:1d.3 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93)
00:1f.0 ISA bridge: Intel Corporation ICH9M LPC Interface Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation ICH9M/M-E SATA AHCI Controller (rev 03)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 03)
04:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)
05:00.0 Ethernet controller: Atheros Communications AR8132 Fast Ethernet (rev c0)
[nyslay@chakra ~]$


I have CD with Sabayon 5.5 x86 e17, could you tell me what i should to do, to correctly boot from CD Sabayon 5.5
Or I must install Sabayon 5.4, turn off the module(acer_wmi), and then update the system

[Fitzcarraldo]

When you say "after some time the system was booting, the matrix baclight turn off(The matte screen), and I see nothing, because everything is dark", do you get as far as the LiveDVD boot menu? Does the screen going dark happen before or after you select one of the entries in the LiveDVD boot menu?

If you can get to the LiveDVD's boot menu, press F5 and append a kernel boot parameter to the end of the kernel boot line and hit Enter.

Now, the problem is I don't have your laptop so I can only guess what might work. Google tells me a couple of people have suggested that acer-wmi.blacklist=yes is a kernel boot parameter that stops the acer_wmi module loading, but I don't see that parameter mentioned in the official kernel boot parameters documentation, so I have my doubts that it is a valid boot parameter. Nevertheless, try it to see what happens.

A kernel boot parameter that is valid is acpi_backlight=vendor and acpi_backlight=video. If the vendor's (Acer's) module acer_wmi is the cause of the problem, then another thing to try is pressing F5 and appending acpi_backlight=video to the end of the kernel boot line and hitting Enter. That way the kernel will ignore the Acer module and use the ACPI driver instead of the acer_wmi driver. Also try the opposite, i.e. acpi_backlight=vendor to see if that works.

[Fitzcarraldo]

Yet another thing to try, in case the problem is being caused by the Intel GPU, is to press F5 at the LiveDVD boot menu and try a different video driver instead of the Intel video driver. So, press F5 and append xdriver=vesa to the kernel boot line and hit Enter.

[nyslay]

When you say "after some time the system was booting, the matrix baclight turn off(The matte screen), and I see nothing, because everything is dark", do you get as far as the LiveDVD boot menu? Does the screen going dark happen before or after you select one of the entries in the LiveDVD boot menu?

- Yes, a can see the LiveDVD boot menu.


I checked all the methods proposed and none is not working.
I i added the method to the end of boot line, hit Enter, and still have exactly the same problem.


Do you have a link to Sabayon 5.4 x86 KDE edition?
Maybe i try to install Sabayon 5.4 unload acer_wmi, and update system to the newest version of kernel??

[Fitzcarraldo]

Try first appending the following two boot parameters: acpi_osi=Linux acpi_backlight=vendor
then afterwards try the following two boot parameters: acpi_osi=Linux acpi_backlight=video

Moving this thread to the Installation of Sabayon Linux shed (forum).

[Fitzcarraldo]

Do you have a link to Sabayon 5.4 x86 KDE edition?
Maybe i try to install Sabayon 5.4 unload acer_wmi, and update system to the newest version of kernel??

You could try http://tracker.sabayon.org/ and use a torrent.

[nyslay]

I tried this

Try first appending the following two boot parameters: acpi_osi=Linux acpi_backlight=vendor
then afterwards try the following two boot parameters: acpi_osi=Linux acpi_backlight=video

and also it does not change anything

[nyslay]

recently a try to instal and usa ArchLinux, and in that OS a have the same problem, but I found on the Arch forum that solution:

Code: Select all

I had the same problem, solved by adding a /etc/rc.local
setpci -s 00:02.0 F4.B=00

To adjust the brightness to add to the kernel line:
acpi_osi=Linux

Sorry for my bad english.


In Arch that solution work corectly.
Maybe someone know if that solution work in Sabayon ??