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Asus Eee PC 1225b

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Backlight support

Brightness LCD may changed by Fn+F5/Fn+F6. To support it you must config kernel

KERNEL Backlight
Power management and ACPI options --->
  [*] ACPI (Advanced Configuration and Power Interface) Support --->
    <*> AC Adapter
    <*> Battery
    -*- Button
    -*- Video
    <*> Fan
    <*> Processor
    <*> Thermal Zone
    [*] Power Management Timer Support

This options also add other functional of your laptop.

USB 3.0 support

USB 3.0 provides by ASMedia ASM1042 SuperSpeed Controller. Gentoo sources have drivers for it

KERNEL USB Support
Device Drivers  --->
    [*] USB support  --->
        <*> Support for Host-side USB
        <M> xHCI HCD (USB 3.0) support
        <*> EHCI HCD (USB 2.0) support
        <*> UHCI HCD support (most Intel and VIA) support
Note
It nessecery, that xHCI HCD support will be as module. Else USB3 ports will doesn't work!

802.11 WiFi

WiFi is provided by Broadcom BCM4313 802.11bgn Wireless Network Adapter

KERNEL WiFi Support
[*] Networking support  --->
    [*] Wireless  --->
        <*>   cfg80211 - wireless configuration API
        [*]     enable powersave by default
        <*>   Generic IEEE 802.11 Networking Stack (mac80211)
        [*]   Minstrel
        [*]     Minstrel 802.11n support
              Default rate control algorithm (Minstrel)  --->
        [*]   Enable LED triggers
Device Drivers  --->
     [*] Network device support  --->
         [*] Wireless LAN  --->
             <M> Broadcom 43xx wireless support (mac80211 stack)
             [*]    Support for G-PHY (802.11g) devices
             [*]    Support for N-PHY (the main 802.11n series) devices
             [*]    Support for LP-PHY (low-power 802.11g) devices
             [*]    Support for HT-PHY (high throughput 802.11n) devices
             [M]    Broadcom IEEE802.11n PCIe SoftMAC WLAN driver
        Broadcom specific AMBA --->
         {M} BCMA support
         [*] Support for BCMA on PCI-host bus
         -*- BCMA Broadcom PCI core driver
    [*] LED Support  --->
        <*>   LED Class Support
-*- Cryptographic API --->
    -*- AES cipher algorithms
    -*- AES cipher algorithms (x86_64)

Minstrel and its 802.11n support is a rate control algorithm[1] should always be activated.[2]

Bluetooth

Bluetooth is provided by Broadcom(?) chip.

KERNEL Bluetooth support
[*] Networking support --->
    <*> Bluetooth subsystem support --->
        [*] Bluetooth Classic (BR/EDR) features
        <*> RFCOMM protocol support
        <*> HIDP protocol support
    [*] Bluetooth Low Energy (LE) features
        Bluetooth device drivers --->
            <*> HCI USB driver
            [*] Broadcom protocol support
            <*> HCI UART driver
                [*] Broadcom protocol support
            <*> HCI BCM203x USB driver

Ethernet

Ethernet is provided by a Realtek RTL8101E Fast Ethernet device.

KERNEL Ethernet Support
Device Drivers  --->
    Network device support --->
      Ethernet driver support --->
        [*] Realtek devices
          <*>/<M> Realtek 8169 gigabit ethernet support

You can compile ethernet driver as module, then you must check loading this module.

Graphics with open-source radeon drivers

All the necessary firmware is provided with x11-drivers/radeon-ucode package (it is easy to emerge within a chrooted environment):

root #emerge --ask radeon-ucode

Kernel parameters are well described in the article about Radeon. However the choice of firmware isn't that obvious. As it is supposed here, APU is usually detected as PALM, while in fact it is closer to SUMO. The only way out is to compile them both into kernel:

KERNEL Radeon drivers
Device Drivers  --->
    Generic Driver Options  --->
        -*- Userspace firmware loading support
        [*] Include in-kernel firmware blobs in kernel binary
            (radeon/PALM_me.bin radeon/PALM_pfp.bin radeon/SUMO_me.bin radeon/SUMO_pfp.bin radeon_SUMO_rlc.bin)
            (/lib/firmware) Firmware blobs root directory

This lets kernel modesetting work properly.

Hardware acceleration video

Laptop has GPU Radeon HD6320. This card support some codecs for hardware acceleration:

  • MPEG1
  • MPEG2
  • H264
  • VC1
  • MPEG4

It's means that your may use GPU for decoding several video and havn't 100% load CPU.

For support hardware acceleration you must edit your install libs and player wich support VDPAU technology. Enabling USE flag vdpau and update world.

FILE /etc/portage/make.conf
USE="... vdpau ..."

Now you can manually setup the name of back-end driver with help of VDPAU_DRIVER environment variable. To do that you need to add the following line to ~/.bashrc file (provided that Bash is the default shell of a user who is going to run graphical environment).

FILE ~/.bashrcLoged as a user who run graphical interface
export VDPAU_DRIVER=r600

After installation you can check vdpauinfo for get info

user $vdpauinfo
CODE output vdpauinfo
display: :0   screen: 0
API version: 1
Information string: G3DVL VDPAU Driver Shared Library version 1.0

Video surface:

name   width height types


420    16384 16384  NV12 YV12 
422    16384 16384  UYVY YUYV 
444    16384 16384  Y8U8V8A8 V8U8Y8A8 

Decoder capabilities:

name                        level macbs width height


MPEG1                           0  9216  2048  1152
MPEG2_SIMPLE                    3  9216  2048  1152
MPEG2_MAIN                      3  9216  2048  1152
H264_BASELINE                  41  9216  2048  1152
H264_MAIN                      41  9216  2048  1152
H264_HIGH                      41  9216  2048  1152
VC1_SIMPLE                     --- not supported ---
VC1_MAIN                       --- not supported ---
VC1_ADVANCED                    4  9216  2048  1152
MPEG4_PART2_SP                  3  9216  2048  1152
MPEG4_PART2_ASP                 5  9216  2048  1152
DIVX4_QMOBILE                  --- not supported ---
DIVX4_MOBILE                   --- not supported ---
DIVX4_HOME_THEATER             --- not supported ---
DIVX4_HD_1080P                 --- not supported ---
DIVX5_QMOBILE                  --- not supported ---
DIVX5_MOBILE                   --- not supported ---
DIVX5_HOME_THEATER             --- not supported ---
DIVX5_HD_1080P                 --- not supported ---
H264_CONSTRAINED_BASELINE      --- not supported ---
H264_EXTENDED                  --- not supported ---
H264_PROGRESSIVE_HIGH          --- not supported ---
H264_CONSTRAINED_HIGH          --- not supported ---
H264_HIGH_444_PREDICTIVE       --- not supported ---
HEVC_MAIN                      --- not supported ---
HEVC_MAIN_10                   --- not supported ---
HEVC_MAIN_STILL                --- not supported ---
HEVC_MAIN_12                   --- not supported ---
HEVC_MAIN_444                  --- not supported ---

Output surface:

name              width height nat types


B8G8R8A8         16384 16384    y  NV12 YV12 UYVY YUYV Y8U8V8A8 V8U8Y8A8 A4I4 I4A4 A8I8 I8A8 
R8G8B8A8         16384 16384    y  NV12 YV12 UYVY YUYV Y8U8V8A8 V8U8Y8A8 A4I4 I4A4 A8I8 I8A8 
R10G10B10A2      16384 16384    y  NV12 YV12 UYVY YUYV Y8U8V8A8 V8U8Y8A8 A4I4 I4A4 A8I8 I8A8 
B10G10R10A2      16384 16384    y  NV12 YV12 UYVY YUYV Y8U8V8A8 V8U8Y8A8 A4I4 I4A4 A8I8 I8A8 

Bitmap surface:

name              width height


B8G8R8A8         16384 16384
R8G8B8A8         16384 16384
R10G10B10A2      16384 16384
B10G10R10A2      16384 16384
A8               16384 16384

Video mixer:

feature name                    sup


DEINTERLACE_TEMPORAL             y
DEINTERLACE_TEMPORAL_SPATIAL     -
INVERSE_TELECINE                 -
NOISE_REDUCTION                  y
SHARPNESS                        y
LUMA_KEY                         -
HIGH QUALITY SCALING - L1        -
HIGH QUALITY SCALING - L2        -
HIGH QUALITY SCALING - L3        -
HIGH QUALITY SCALING - L4        -
HIGH QUALITY SCALING - L5        -
HIGH QUALITY SCALING - L6        -
HIGH QUALITY SCALING - L7        -
HIGH QUALITY SCALING - L8        -
HIGH QUALITY SCALING - L9        -

parameter name                  sup      min      max


VIDEO_SURFACE_WIDTH              y        48     2048
VIDEO_SURFACE_HEIGHT             y        48     1152
CHROMA_TYPE                      y  
LAYERS                           y         0        4

attribute name                  sup      min      max


BACKGROUND_COLOR                 y  
CSC_MATRIX                       y  
NOISE_REDUCTION_LEVEL            y      0.00     1.00
SHARPNESS_LEVEL                  y     -1.00     1.00
LUMA_KEY_MIN_LUMA                y  
LUMA_KEY_MAX_LUMA                y

VDPAU support:

VLC player

VLC have support vdpau. To use it you must enable USE flag vdpau. If you enable it to /etc/portage/make.conf, it not necessary.

In VLC go to settings (Ctrl+P) --> Input / Codecs --> Hardware-accelerated decoding choose VDPAU video decoder

When VLC play movie with hardware acceleration load CPU is 30-40%.

Audio

ALSA configuration

KERNEL Alsa configuration
Device Drivers  --->
  Sound card support  --->
    <*> Advanced Linux Sound Architecture  --->
      [*] PCI sound devices --->
        <*> Intel HD Audio --->
          [*] Build Realtek HD-audio codec support
          [*] Build HDMI/DisplayPort HD-audio codec support

A good way to manage ALSA is to emerge alsa-utils:

root #emerge --ask alsa-utils

To start alsa at boot time type:

root #rc-update add alsasound boot

There is a problem that actually ALSA often sees two sound cards: HD-Audio Generic (that is a kind of a virtual device, i.e. it doesn't actually play music) and the required HDA ATI SB. The simplest way to check it is to launch

user $aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: SB [HDA ATI SB], device 0: ALC269VB Analog [ALC269VB Analog]
  Suvdevices: 1/1
  Subdevice #0: subdevice #0

If HD-Audio Generic is the first number, it might be the default card. If it is the case, than you're likely to have no sound unless the default card is switched from 0 to 1.

FILE /etc/asound.conf
defaults.ctl.card 1
defaults.pcm.card 1
defaults.timer.card 1

Memory Card Reader

Card reader is provided by Alcor Micro.

KERNEL 
Device Drivers  --->
    <*> MMC/SD/SDIO card support  --->
        <*>   MMC block device driver
        [*]     Use bounce buffer for simple hosts

Webcam

Webcam is supported with standart UVC

KERNEL Webcam Support
Device Drivers  --->
    <*> Multimedia support  ---> 
        [*] Media USB Adapters  ---> 
            <*> USB Video Class (UVC)

Tips and tricks

If on your laptop sometimes keyboard and touchpad don't work add some parameters to kernel

FILE /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="i8042.nomux i8042.reset"

Then rebuild grub config

root #grub2-mkconfig -o /boot/grub/grub.cfg

After that reboot your system.

See aslo


References

  1. ↑ https://wireless.wiki.kernel.org/en/developers/Documentation/mac80211/RateControl/minstrel
  2. ↑ Forums thread: Kernel change : 3.16.3 -> 3.17.8 : no wlan device anymore
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