Connecting projectors via VGA to MBA 2012 not working consistently?

I am a trainer working around uk and Europe. I keep finding displays that will not work with my MBA. What happened to plug and play?....

I have used macs for 10 years
Okay, so have I, and I keep having surprises and keep learning. So what are you trying to say?
Just will not show up on projected screen despite me changing settings,detecting display,restarting etc
I sometimes find defect cables and connectors on site, I'm sure you spot those as well. Who to blame. Other than that, I've always got some signal onto the screen, even if not pretty colors, ideal contrast and brightness, or perfectly scaled. Or simply at a lower resolution and/or refresh rate than what I've been wishing for.
With OS X's UI regarding external displays basically not having changed since 10.4, we sure have no trouble with handling our machines, and while our Windows friends are still trying to remember where all to press and click, I'm up and running or having a coffee.
Interfaces have changed, but the number of adapters has grown accordingly, and projectors and displays have gotten more "receptive" as well. So, not much in the way here, either.
The gear that is a royal pain in-you-know-where to work with now, has been the same before... all the time...
What else - any more specific description, e.g. a typical showcase you could tell us of? Thanks.

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Hi,
My wifi card RTL8188CE does not work consistently with kernel driver rlt8192ce. The problem that i observe is that after some time ~1hr wifi devices get disconnected and are not able to reconnect. On restarting wifi using systemctl restart hostapd sometimes the system hangs.
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03:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8188CE 802.11b/g/n WiFi Adapter (rev 01)
Subsystem: ASUSTeK Computer Inc. Device 84b5
Kernel driver in use: rtl8192ce
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Jan 22 19:30:56 Blitz-4 kernel: DMA: Out of SW-IOMMU space for 105 bytes at device 0000:05:00.0
Jan 22 19:30:56 Blitz-4 kernel: [color=red]rtl8192ce 0000:05:00.0: swiotlb buffer is full (sz: 105 bytes)[/color]
Jan 22 19:30:56 Blitz-4 kernel: DMA: Out of SW-IOMMU space for 105 bytes at device 0000:05:00.0
Jan 22 19:30:56 Blitz-4 kernel: rtl8192ce 0000:05:00.0: swiotlb buffer is full (sz: 105 bytes)
Jan 22 19:30:56 Blitz-4 kernel: DMA: Out of SW-IOMMU space for 105 bytes at device 0000:05:00.0
Jan 22 19:30:57 Blitz-4 kernel: rtl8192ce 0000:05:00.0: swiotlb buffer is full (sz: 105 bytes)
Jan 22 19:30:57 Blitz-4 kernel: DMA: Out of SW-IOMMU space for 105 bytes at device 0000:05:00.0
Jan 22 19:30:57 Blitz-4 kernel: rtl8192ce 0000:05:00.0: swiotlb buffer is full (sz: 105 bytes)
Jan 22 19:30:57 Blitz-4 kernel: DMA: Out of SW-IOMMU space for 105 bytes at device 0000:05:00.0
Jan 22 19:30:57 Blitz-4 kernel: DMA: Out of SW-IOMMU space for 105 bytes at device 0000:05:00.0
Jan 22 19:30:57 Blitz-4 kernel: DMA: Out of SW-IOMMU space for 9100 bytes at device 0000:05:00.0
Jan 22 19:30:57 Blitz-4 kernel: DMA: Out of SW-IOMMU space for 105 bytes at device 0000:05:00.0
Jan 22 19:30:57 Blitz-4 kernel: DMA: Out of SW-IOMMU space for 105 bytes at device 0000:05:00.0
Jan 22 19:30:57 Blitz-4 kernel: DMA: Out of SW-IOMMU space for 105 bytes at device 0000:05:00.0
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Jan 22 19:30:58 Blitz-4 kernel: IP: [<ffffffff811b29a6>] __kmalloc+0x86/0x1c0
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Jan 22 19:30:58 Blitz-4 kernel:CPU: 3 PID: 1238 Comm: Cache2 I/O Tainted: G O 3.18.2-2-ARCH #1
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Same problem to me. lspci output:
07:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8188CE 802.11b/g/n WiFi Adapter (rev 01)
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Apr 04 16:06:29 nzk kernel: rtl8192ce 0000:07:00.0: swiotlb buffer is full (sz: 9100 bytes)
Apr 04 16:06:29 nzk kernel: DMA: Out of SW-IOMMU space for 9100 bytes at device 0000:07:00.0
Apr 04 16:06:29 nzk kernel: rtl8192ce 0000:07:00.0: swiotlb buffer is full (sz: 9100 bytes)
Apr 04 16:06:29 nzk kernel: DMA: Out of SW-IOMMU space for 9100 bytes at device 0000:07:00.0
Apr 04 16:06:29 nzk kernel: rtl8192ce 0000:07:00.0: swiotlb buffer is full (sz: 9100 bytes)
Apr 04 16:06:29 nzk kernel: DMA: Out of SW-IOMMU space for 9100 bytes at device 0000:07:00.0
Apr 04 16:06:29 nzk kernel: rtl8192ce 0000:07:00.0: swiotlb buffer is full (sz: 9100 bytes)
Apr 04 16:06:29 nzk kernel: DMA: Out of SW-IOMMU space for 9100 bytes at device 0000:07:00.0
A bug report submitted to redhat bugzilla https://bugzilla.redhat.com/show_bug.cg … id=1203241 suggests it may be caused by a bug in the rtl8192ce kernel module since linux 3.17.7. I hope this problem could be solved as quickly as possible.
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Connecting projectors via VGA to MBA 2012 not working consistently?

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