Screen resolution does not change back after using a projector

Hi!
My office uses several different models of macbooks, but there is a small problem with all the Airs. When I have been using them with a projector I have to change back the screen resolution manually (go to the system settings and change resolution). On the macbook pros, however, the desktop restores themselves as soon as the projector is disconnected. It seems to me that this should be the standard behaviour of all macs, does anyone know why it is not working on the Airs?
Best regards
Erik

Hi Erik,
I had this problem on a MacBook and resolved it by recreating some plist files.
~/Library/Preferences/ByHost/com.apple.windowserver.xxxxxxxxxxxx.plist
~/Library/Preferences/ByHost/com.apple.preference.displays.xxxxxxxxx.plist
The xxxx's are your machine's EthernetID (MAC Address). I wouldn't delete, rather just move them to your Desktop and restart the computer. See if that resolves it.

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Address: 2
AFG Function Id: 0x1 (unsol 0)
Vendor Id: 0x80862882
Subsystem Id: 0x80860101
Revision Id: 0x100000
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rates [0x0]:
bits [0x0]:
formats [0x0]:
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Default Amp-Out caps: N/A
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Power states: D0 D3
Power: setting=D0, actual=D0
GPIO: io=0, o=0, i=0, unsolicited=0, wake=0
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Device: name="HDMI 0", type="HDMI", device=3
Converter: stream=8, channel=0
Digital: Enabled GenLevel
Digital category: 0x2
IEC Coding Type: 0x0
PCM:
rates [0x7f0]: 32000 44100 48000 88200 96000 176400 192000
bits [0x1e]: 16 20 24 32
formats [0x5]: PCM AC3
Power states: D0 D3
Power: setting=D0, actual=D0
Node 0x03 [Audio Output] wcaps 0x6611: 8-Channels Digital
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Digital: Enabled
Digital category: 0x0
IEC Coding Type: 0x0
PCM:
rates [0x7f0]: 32000 44100 48000 88200 96000 176400 192000
bits [0x1e]: 16 20 24 32
formats [0x5]: PCM AC3
Power states: D0 D3
Power: setting=D0, actual=D0
Node 0x04 [Pin Complex] wcaps 0x40778d: 8-Channels Digital Amp-Out CP
Control: name="HDMI/DP,pcm=3 Jack", index=0, device=0
Control: name="IEC958 Playback Con Mask", index=0, device=0
Control: name="IEC958 Playback Pro Mask", index=0, device=0
Control: name="IEC958 Playback Default", index=0, device=0
Control: name="IEC958 Playback Switch", index=0, device=0
Control: name="ELD", index=0, device=3
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DefAssociation = 0x1, Sequence = 0x0
Pin-ctls: 0x40: OUT
Unsolicited: tag=01, enabled=1
Power states: D0 D3
Power: setting=D0, actual=D0
Connection: 2
0x02* 0x03
Node 0x05 [Pin Complex] wcaps 0x40778d: 8-Channels Digital Amp-Out CP
Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
Amp-Out vals: [0x00 0x80]
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DefAssociation = 0x2, Sequence = 0x0
Pin-ctls: 0x40: OUT
Unsolicited: tag=00, enabled=0
Power states: D0 D3
Power: setting=D0, actual=D0
Connection: 2
0x02 0x03*
Node 0x06 [Pin Complex] wcaps 0x40778d: 8-Channels Digital Amp-Out CP
Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
Amp-Out vals: [0x00 0x80]
Pincap 0x09000094: OUT Detect HBR HDMI DP
Pin Default 0x58560030: [N/A] Digital Out at Int HDMI
Conn = Digital, Color = Unknown
DefAssociation = 0x3, Sequence = 0x0
Pin-ctls: 0x40: OUT
Unsolicited: tag=00, enabled=0
Power states: D0 D3
Power: setting=D0, actual=D0
Connection: 2
0x02 0x03*
Node 0x07 [Vendor Defined Widget] wcaps 0xf00000: Mono
After disconnect/reconnect it changes to this:
Codec: Intel Valleyview2 HDMI
Address: 2
AFG Function Id: 0x1 (unsol 0)
Vendor Id: 0x80862882
Subsystem Id: 0x80860101
Revision Id: 0x100000
No Modem Function Group found
Default PCM:
N/A
Default Amp-In caps: N/A
Default Amp-Out caps: N/A
State of AFG node 0x01:
Power: setting=UNKNOWN, actual=UNKNOWN, Error, Clock-stop-OK, Setting-reset
Invalid AFG subtree
I figured that the problem is probably related to powermanagement, so I experimented with powertop. This resulted in a reduced consumption of 1W when idle, which is nice but did not solve the original problem...
The Questions
Is there a way to completely reinit the HDMI subsystem just like on a reboot?
Is there an option comparable to hdmi_force_hotplug=1 on the pi that forces the HDMI signal to stay up?
Thank You for Your time!
Best regards,
Lars

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