lock screen serious problem with sleep

[Neal Becker]

Dan Mossor wrote:

> On 06/04/2015 12:15 PM, Neal Becker wrote:
>> I have 2 monitors (laptop + external).  If I close laptop lid, system
>> will
>> sleep.  Now disconnect hdmi to monitor.  Now open lid.  lock screen is
>> displayed.
>>
>> But there is no way to enter the password.  I can move mouse around.
>> Caplock is responded to.  But I can't enter any characters into the
>> password field.
>>
>> Only thing I can do is switch to VT, and do systemctl restart sddm.
>>
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> Sounds like the infamous plasmashell lockup. Since the screen was
> reconfigured while blanked, something got stuck. All I can say is to
> disconnect the HDMI cable before you close the laptop lid. Until this
> bug gets fixed (or even found), all we can do is work around the issues.
> 
> My latest glitch is that it won't turn the backlight back on after it
> has powered it off - VTs work just fine, but the primary display where
> SDDM and plasmashell are running stay blank.
> 
> 

I did disconnect before sleeping - that doesn't help :(

The only workaround for now is turn off lock screen on wakeup.