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On 04/14/2016 03:39 PM, Mick wrote: |
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> On Thursday 14 Apr 2016 11:21:39 Yuri K. Shatroff wrote: |
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>> 14.04.2016 10:43, J. Roeleveld wrote: |
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>>> On Thursday, April 14, 2016 10:33:10 AM Yuri K. Shatroff |
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>>> wrote: |
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>>>> 14.04.2016 00:49, Dale wrote: |
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>>>>> Yuri K. Shatroff wrote: |
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>>>> Hi Dale, |
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>>>> |
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>>>>> I'm not sure on where you got the black screen. If it is |
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>>>>> when X started, did you switch to sddm or some other |
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>>>>> compatible display manager? The old kdm isn't supported |
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>>>>> and from what I read, doesn't work. That may explain the |
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>>>>> black screen. |
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>>>> |
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>>>> Sddm worked as expected, not to mention its veeery slow |
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>>>> interface (for that nvidia drivers can be blamed, but |
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>>>> whatever). The black screen appeared after logging in. |
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>>> |
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>>> Slow interface? It works quite well on my laptop. Did you add |
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>>> the "sddm" user to the "video" group as mentioned in the |
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>>> upgrade guide? |
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>> |
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>> No I didn't because I had a much more blatant issue with the |
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>> whole desktop than the 'SDDM display issues', I just didn't get |
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>> to that. Thanks for pointing it out, next time I'll give it a |
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>> try. |
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> |
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> I don't have NVidia or use the full plasma desktop environment on |
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> my laptop (I use enlightenment instead with a Radeon card). |
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> However, I have not added sddm to the video group and have not |
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> noticed anything undue in my logs. I have however noticed that |
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> sddm is slightly slower than kdm. |
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> |
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> Why is the video group needed? What does it do? |
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> |
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|
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The sddm user only needs to be in the video group if using the |
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proprietary NVIDIA driver, as it controls access to some low-level |
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device nodes created by that driver for the use of the NVIDIA driver's |
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userspace component. It may be possible to use those device nodes to |
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perform certain privileged actions (the code behind them is in a |
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binary blob in the kernel with no source), so they are protected such |
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that only members of the video group can use them. |
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|
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- -- |
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Jonathan Callen |
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