94 lines
3.5 KiB
Markdown
94 lines
3.5 KiB
Markdown
[[!meta title="Status of Linux on the MacBook Air 4,2"]]
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## Introduction
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Following up my
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[[recent|macbook-air-42-correcting-multimedia-key-mapping-and-status]]
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[[posts|macbook-air-42-touchpad-keyboard-correct-screen-resolution]]
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[[about the MacBook Air 4,2|macbook-air-42-archlinux]] with Linux,
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here's a status report of what works and what is still missing.
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This report is based on ***Linux 3.2.0-rc5***.
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## Screen Resolution and external screens
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Great news, Linus' tree merged patches necessary for full screen resolution
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and external screens work as well:
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Screen 0: minimum 320 x 200, current 2560 x 2340, maximum 8192 x 8192
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eDP1 connected 1440x900+0+1440 (normal left inverted right x axis y axis) 30mm x 179mm
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1440x900 60.0*+
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VGA1 disconnected (normal left inverted right x axis y axis)
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HDMI1 disconnected (normal left inverted right x axis y axis)
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DP1 disconnected 2560x1440+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
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HDMI2 disconnected (normal left inverted right x axis y axis)
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HDMI3 disconnected (normal left inverted right x axis y axis)
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DP2 disconnected (normal left inverted right x axis y axis)
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DP3 disconnected (normal left inverted right x axis y axis)
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2560x1440 (0xb2) 241.5MHz
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h: width 2560 start 2608 end 2640 total 2720 skew 0 clock 88.8KHz
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v: height 1440 start 1443 end 1448 total 1481 clock 60.0Hz
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An external monitor was tested via Mini-DP-to-HDMI adapter and Mini-DP-to-DVI
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adapter with resolutions from 1920x1080 (24" Samsung) up to 2560x1440 (27" Dell).
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## Keyboard/Multimedia Keys (FN+F1..F12)
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With the current kernel all multimedia keys match correctly.
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## Keyboard/Backlight
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Keyboard backlight can be controlled using
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[kbsd](http://git.schottelius.org/?p=kbsd;a=summary). This works fine,
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but it could be improved to react on the light sensor.
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The question simply is, how to map the light sensor values to keyboard
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backlight settings. If you've got a good table or function to apply,
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drop me a mail, so I can include it.
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## Touchpad
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The touchpad works almost completly, the only
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problem left is that
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the mouse pointer does not move when the mouse button is pressed.
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This may be a configuration problem of the synaptics touchpad, but
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I haven't found a fix for this.
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## Screen backlight
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The nice utility **xbacklight** still does not work,
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[11:14] brief:~% xbacklight
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No outputs have backlight property
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but dimming works manually via echo:
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[21:15] brief:~# echo 2200 > /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/brightness
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And the display is not switched off when lid is closed.
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ACPI reports the lid event, though. Probably a related problem.
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## WLAN / brcmsmac / Broadcom BCM43224
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This used to be fixed in my own patched kernel, but since I've got
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a new macbook air 4,2, it does suffers the
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[network process hang issue in the **brcmsmac** driver](https://lkml.org/lkml/2011/10/18/145)
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again. Iterating over several different kernels did not yet fix this problem.
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Though interestingly after 2 suspend and resume cycles it works, until the 4th of 5th
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suspend cycle, at which all network processes hang again, if the connection to the
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AP is lost.
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## Current problem summary
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* Clicking and moving the mouse pointer does not work
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* xbacklight does not recognise backlight controls
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* Display is not switched off on lid close
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* Network processes hang when the connection to the AP is lost/cannot be established
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[[!tag net unix]]
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