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On 2016-12-17 21:35, Ian Zimmerman wrote: |
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> > > [ 2890.175] (++) using VT number 2 |
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> > > [ 2890.175] (WW) xf86OpenConsole: VT_ACTIVATE failed: Operation not permitted |
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> > > [ 2890.175] (EE) xf86OpenConsole: Switching VT failed |
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I made some progress, but now I am blocked in an even tougher place :-( |
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The error above had a simple and amusing cause. My shell code that run |
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startx redirected both stdout and stderr to a logfile. And Xorg |
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inspects those file descriptors to guess what the current vt is, so that |
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when the _requested_ vt is the same, it can avoid the switch, which does |
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require root. So, when I left stdout and stderr going to the terminal |
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this part started working. [1] |
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But now I hit the error chronicled at [2]. A look at kernel source, in |
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drivers/gpu/drm/drm_ioctl.c, shows that the relevant kernel ioctl is |
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declared thus: |
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DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), |
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at least in the kernel version I run (4.4.26) which doesn't inspire much |
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hope :-( |
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All this really does seem to depend on the precise GPU model one has. |
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[1] |
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This trick by Xorg is completely undocumented! I really had to wallow |
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in the source code to discover it. |
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[2] |
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https://unix.stackexchange.com/questions/178883/running-x-without-root |
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-- |
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