Re: Xvfb concerns and dummy driver issues

2017-05-02 Thread Adam Jackson 
On Fri, 2017-04-28 at 14:24 -0400, David Jackson wrote:
> Is the plan to keep Xvfb as-is (KDrive?)

As-is, yes. Strictly speaking, Xvfb is not a kdrive server, in the same
sense that Xorg is not a kdrive server. There was a very similar kdrive
server named Xfake, and that was indeed deleted.

> Any ideas about why the dummy driver was not working (killing the
> headless dummy X server brings down any X server running on hardware,
> like the dummy X server somehow gets entangled with other X servers
> on the system),

By default, the Xorg server will remember which virtual terminal it was
launched from (if any), and will attempt to switch back to it when it
exits (or regenerates). So if you start both the dummy and hardware
server from the console, terminating either one will switch back to the
console, which may look like you're "bringing down" the other one.

You can suppress this by launching the dummy server with '-novtswitch'
on the command line.

> and problems playing video?

I'm not sure this is specific enough to guess at.

- ajax
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Re: Xvfb concerns and dummy driver issues

2017-04-28 Thread David Jackson 
Is the plan to keep Xvfb as-is (KDrive?) or to move it to a wrapper around
Xorg+Dummy? Any ideas about why the dummy driver was not working (killing
the headless dummy X server brings down any X server running on hardware,
like the dummy X server somehow gets entangled with other X servers on the
system), and problems playing video? Given these unreliabilities,  they
would need resolution of these issues.

On Mon, Apr 24, 2017 at 2:47 PM, Adam Jackson  wrote:

> On Sat, 2017-04-22 at 16:45 -0400, David Jackson wrote:
> > I have been a using xvfb for quite a while because I use it for a
> > headless setup with x11vnc connecting to it. I became greatly
> > concerned when I heard xvfb will be removed.
>
> Your concerns are unwarranted. Xvfb isn't going away.
>
> - ajax
>
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Xvfb concerns and dummy driver issues

2017-04-22 Thread David Jackson 
I have been a using xvfb for quite a while because I use it for a headless
setup with x11vnc connecting to it. I became greatly concerned when I heard
xvfb will be removed. xvfb has worked perfectly for me so that this
workable solution for a headless server being changed is concerning.

First,  if we insist on doing this, provide compatibility command line
interfaces for Xvfb, Xnest and Xephyr, that are identical in functionality
or else they are going to break a lot of scripts and programs that depend
on these commands, and as well they are going to lead to mass confusion
since how-tos that use these commands all over the internet no longer will
work. Compatibility command line commands for these are essential.

I am not so much opposed to removing Kdrive code if the xephyr, xnest and
xvfb commands are retained in a backward compatable manner, implemented on
the X.org code base.

Second:

 I tried xorg-driver-dummy. Numerous problems with this: when used with
x11vnc,

vnc clients get disconnected often when playing videos (some odd
interaction between x11vnc and Xorg, this does NOT happen with xvfb).

Killing an X.org server using Dummy also tends to bring down any other
hardware X server also running on the computer.

The mouse pointer is oversized


here is the command i used to start the server:

Xorg -novtswitch -configdir "../xconfdir" -noreset +extension GLX
+extension RANDR +extension RENDER -logfile ./10xdummy.log -config
./xorg.conf :3 &



here is the xorg.conf
# This xorg configuration file is meant to be used by xpra
# to start a dummy X11 server.
# For details, please see:
# https://xpra.org/Xdummy.html

Section "ServerFlags"
  Option "DontVTSwitch" "true"
  Option "AllowMouseOpenFail" "true"
  Option "PciForceNone" "true"
  Option "AutoEnableDevices" "false"
  Option "AutoAddDevices" "false"
EndSection

Section "InputDevice"
  Identifier "dummy_mouse"
  Option "CorePointer" "true"
  Driver "void"
EndSection

Section "InputDevice"
  Identifier "dummy_keyboard"
  Option "CoreKeyboard" "true"
  Driver "void"
EndSection

Section "Device"
  Identifier "dummy_videocard"
  Driver "dummy"
  Option "ConstantDPI" "true"
  #VideoRam 4096000
  #VideoRam 256000
  VideoRam 192000
  Option "NoDRI"
EndSection

Section "Monitor"
  Identifier "dummy_monitor"
  HorizSync   5.0 - 1000.0
  VertRefresh 5.0 - 200.0
  #This can be used to get a specific DPI, but only for the default
resolution:
  #DisplaySize 508 317
  #NOTE: the highest modes will not work without increasing the VideoRam
  # for the dummy video card.
  Modeline "32768x32768" 15226.50 32768 35800 39488 46208 32768 32771 32781
32953
  Modeline "32768x16384" 7516.25 32768 35544 39192 45616 16384 16387 16397
16478
  Modeline "16384x8192" 2101.93 16384 16416 24400 24432 8192 8390 8403 8602
  Modeline "8192x4096" 424.46 8192 8224 9832 9864 4096 4195 4202 4301
  Modeline "5496x1200" 199.13 5496 5528 6280 6312 1200 1228 1233 1261
  Modeline "5280x1080" 169.96 5280 5312 5952 5984 1080 1105 1110 1135
  Modeline "5280x1200" 191.40 5280 5312 6032 6064 1200 1228 1233 1261
  Modeline "5120x3200" 199.75 5120 5152 5904 5936 3200 3277 3283 3361
  Modeline "4800x1200" 64.42 4800 4832 5072 5104 1200 1229 1231 1261
  Modeline "3840x2880" 133.43 3840 3872 4376 4408 2880 2950 2955 3025
  Modeline "3840x2560" 116.93 3840 3872 4312 4344 2560 2622 2627 2689
  Modeline "3840x2048" 91.45 3840 3872 4216 4248 2048 2097 2101 2151
  Modeline "3840x1080" 100.38 3840 3848 4216 4592 1080 1081 1084 1093
  Modeline "3600x1200" 106.06 3600 3632 3984 4368 1200 1201 1204 1214
  Modeline "3288x1080" 39.76 3288 3320 3464 3496 1080 1106 1108 1135
  Modeline "2048x2048" 49.47 2048 2080 2264 2296 2048 2097 2101 2151
  Modeline "2048x1536" 80.06 2048 2104 2312 2576 1536 1537 1540 1554
  Modeline "2560x1600" 47.12 2560 2592 2768 2800 1600 1639 1642 1681
  Modeline "2560x1440" 42.12 2560 2592 2752 2784 1440 1475 1478 1513
  Modeline "1920x1440" 69.47 1920 1960 2152 2384 1440 1441 1444 1457
  Modeline "1920x1200" 26.28 1920 1952 2048 2080 1200 1229 1231 1261
  Modeline "1920x1080" 23.53 1920 1952 2040 2072 1080 1106 1108 1135
  Modeline "1680x1050" 20.08 1680 1712 1784 1816 1050 1075 1077 1103
  Modeline "1600x1200" 22.04 1600 1632 1712 1744 1200 1229 1231 1261
  Modeline "1600x900" 33.92 1600 1632 1760 1792 900 921 924 946
  Modeline "1440x900" 30.66 1440 1472 1584 1616 900 921 924 946
  ModeLine "1366x768" 72.00 1366 1414 1446 1494  768 771 777 803
  Modeline "1280x1024" 31.50 1280 1312 1424 1456 1024 1048 1052 1076
  Modeline "1280x800" 24.15 1280 1312 1400 1432 800 819 822 841
  Modeline "1280x768" 23.11 1280 1312 1392 1424 768 786 789 807
  Modeline "1360x768" 24.49 1360 1392 1480 1512 768 786 789 807
  Modeline "1024x768" 18.71 1024 1056 1120 1152 768 786 789 807
  Modeline "768x1024" 19.50 768 800 872 904 1024 1048 1052 1076


  #common resolutions for android devices (both orientations):
  Modeline "800x1280" 25.89 800 832 928 960 1280 1310 1315 1345
  Modeline "1280x800" 24.15 1280