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Groups > comp.sys.mac.misc > #6346

Re: External monitor not waking

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On 2018-04-25 07:15:20 +0000, Daniel Cohen said:

> My Mac is a 2011 MacBookPro running OS 10.13.4. This is connected by
> Thunderbolt to a Belkin dock, which in turn is connected to a Dell
> U2414H monitor.
> 
> Most of the time this works fine, but recently (not sure if it started
> when I went to 10.13.4 or whether it had happened on 10.13.3) the
> monitor sometimes refuses to wake up when I wake the computer from
> sleep. That is, the monitor insists on remaining in Power Save mode, and
> in fact says "entering power save mode" when the computer wakes.
> 
> So far I have solved it by a mix of turning monitor on and off,
> disconnecting power cable of monitor and reconnecting it, and restarting
> the computer. But I haven't found a consistent set of steps to get it to
> work.
> 
> Any ideas for more diagnostic steps, or even a solution? As I said, this
> is an occasional problem, usually the monitor becomes active as soon as
> the computer wakes, but it occurs often enough to be troublesome.

There seem to be a problem with more secure and tight tolerances in the 
connection between some monitors and graphics cards with upgrades in 
the OS. While my monitor worked fine with SL it have had some problems 
with HS. I solved the problem by exchanging the cable to a new and 
*shorter* one... I have an U2412M.
-- 
teleportation kills

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External monitor not waking dcohenspam@talktalk.net (Daniel Cohen) - 2018-04-25 08:15 +0100
  Re: External monitor not waking android <here@there.was> - 2018-04-25 10:10 +0200
    Re: External monitor not waking dcohenspam@talktalk.net (Daniel Cohen) - 2018-04-25 13:41 +0100
      Re: External monitor not waking Jolly Roger <jollyroger@pobox.com> - 2018-04-25 14:46 +0000
      Re: External monitor not waking android <here@there.was> - 2018-04-25 17:23 +0200
        Re: External monitor not waking nospam <nospam@nospam.invalid> - 2018-04-25 11:51 -0400
          Re: External monitor not waking android <here@there.was> - 2018-04-25 18:12 +0200
  Re: External monitor not waking nospam <nospam@nospam.invalid> - 2018-04-25 05:22 -0400
    Re: External monitor not waking dcohenspam@talktalk.net (Daniel Cohen) - 2018-04-25 13:41 +0100
      Re: External monitor not waking nmassello@yahoo.com (Neill Massello) - 2018-04-25 08:23 -0600
        Re: External monitor not waking Jolly Roger <jollyroger@pobox.com> - 2018-04-25 14:46 +0000
      Re: External monitor not waking nospam <nospam@nospam.invalid> - 2018-04-25 11:51 -0400
        Re: External monitor not waking Jolly Roger <jollyroger@pobox.com> - 2018-04-25 16:19 +0000
          Re: External monitor not waking nospam <nospam@nospam.invalid> - 2018-04-25 12:23 -0400
            Re: External monitor not waking dcohenspam@talktalk.net (Daniel Cohen) - 2018-04-26 08:09 +0100
              Re: External monitor not waking nospam <nospam@nospam.invalid> - 2018-04-26 10:31 -0400
              Re: External monitor not waking Chris Ridd <chrisridd@mac.com> - 2018-04-29 11:20 +0100
                Re: External monitor not waking dcohenspam@talktalk.net (Daniel Cohen) - 2018-04-29 19:15 +0100
                Re: External monitor not waking Chris Ridd <chrisridd@mac.com> - 2018-04-30 17:35 +0100
    Re: External monitor not waking Wade Garrett <wade@cooler.net> - 2018-04-25 15:46 -0400
  Re: External monitor not waking Jolly Roger <jollyroger@pobox.com> - 2018-04-25 14:38 +0000
  Re: External monitor not waking MartinC <noreply@nospam.invalid> - 2018-04-26 13:27 +0200
    Re: External monitor not waking dcohenspam@talktalk.net (Daniel Cohen) - 2018-04-27 07:30 +0100

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