Package: gddccontrol
Version: 0.4.4-1
Severity: normal

Monitor is in the pulldown menu but selecting it only shows:

An error occurred while opening the monitor device.
Maybe this monitor was disconnected, please click on the refresh button near 
the monitor list.

And STDERR prints:
$ ioctl(): Input/output error
ioctl returned -1
Reading EDID 0x50 failed.

Controling the monitor with ddccontrol works, though, like:
$ ddccontrol -r 0x10 -w 1  dev:/dev/i2c-7 

ddc probe data is attached.

Best regards,
Eduard.

-- System Information:
Debian Release: buster/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (1, 
'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.1 (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), 
LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Init: systemd (via /run/systemd/system)

Versions of packages gddccontrol depends on:
ii  ddccontrol      0.4.4-1
ii  libc6           2.27-6
ii  libddccontrol0  0.4.4-1
ii  libglib2.0-0    2.58.1-2
ii  libgtk2.0-0     2.24.32-3
ii  libpango-1.0-0  1.42.4-3
ii  policykit-1     0.105-21

gddccontrol recommends no packages.

gddccontrol suggests no packages.

-- no debconf information

-- 
<BlueByte> Wie heißt denn die Kerneloption für mehr als 4GB Ram?
<cehteh> x86_64 ;)
ddccontrol version 0.4.4
Copyright 2004-2005 Oleg I. Vdovikin ([email protected])
Copyright 2004-2006 Nicolas Boichat ([email protected])
This program comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of this program under the terms of the GNU General 
Public License.

Probing for available monitors.............
Detected monitors :
 - Device: dev:/dev/i2c-7
   DDC/CI supported: Yes
   Monitor Name: Samsung SyncMaster 710TM
   Input type: Digital
  (Automatically selected)
 - Device: dev:/dev/i2c-5
   DDC/CI supported: No
   Monitor Name: VESA standard monitor
   Input type: Digital
Reading EDID and initializing DDC/CI at bus dev:/dev/i2c-7...

EDID readings:
        Plug and Play ID: SAM0168 [Samsung SyncMaster 710TM]
        Input type: Digital

= Samsung SyncMaster 710TM
> Color settings
        > Brightness and Contrast
                > id=magicbright, name=Magic Bright Mode, address=0xdc, 
delay=-1ms, type=2
                  Possible values:
                        > id=text - name=Text, value=1
                        > id=internet - name=Internet, value=2
                        > id=entertain - name=Entertain, value=3
                        > id=custom - name=Custom, value=4
                  supported, value=4, maximum=4
                > id=brightness, name=Brightness, address=0x10, delay=-1ms, 
type=0
                  supported, value=1, maximum=100
                > id=contrast, name=Contrast, address=0x12, delay=-1ms, type=0
                  supported, value=63, maximum=100
        > Color maximum level
                > id=red, name=Red maximum level, address=0x16, delay=-1ms, 
type=0
                  supported, value=32, maximum=64
                > id=green, name=Green maximum level, address=0x18, delay=-1ms, 
type=0
                  supported, value=32, maximum=64
                > id=blue, name=Blue maximum level, address=0x1a, delay=-1ms, 
type=0
                  supported, value=32, maximum=64
        > Various color settings
                > id=colorpreset, name=Color Preset, address=0xe0, delay=-1ms, 
type=2
                  Possible values:
                        > id=normal - name=Normal, value=3
                        > id=custom - name=Custom, value=0
                        > id=warm - name=Warm, value=1
                        > id=cool - name=Cool, value=2
                  supported, value=0, maximum=3
> Others
        > Restore defaults
                > id=defaults, name=Restore Factory Defaults, address=0x4, 
delay=2000ms, type=1
                  Possible values:
                        > id=default - name=Restore Factory Defaults, value=1
                  supported, value=0, maximum=1
                > id=defaultluma, name=Restore Brightness and Contrast, 
address=0x5, delay=2000ms, type=1
                  Possible values:
                        > id=default - name=Restore Brightness and Contrast, 
value=1
                  supported, value=0, maximum=1
                > id=defaultcolor, name=Restore Factory Default Color, 
address=0x8, delay=2000ms, type=1
                  Possible values:
                        > id=default - name=Restore Factory Default Color, 
value=1
                  supported, value=0, maximum=1
                > id=settings, name=Settings, address=0xb0, delay=1000ms, type=1
                  Possible values:
                        > id=default - name=Settings, value=1
                  supported, value=0, maximum=2
        > OSD
                > id=osd, name=On Screen Display, address=0xca, delay=-1ms, 
type=2
                  Possible values:
                        > id=disable - name=Disable, value=1
                        > id=enable - name=Enable, value=2
                  supported, value=2, maximum=2
                > id=osd2, name=On Screen Display (Samsung), address=0xf5, 
delay=-1ms, type=2
                  Possible values:
                        > id=disable - name=Disable, value=1
                        > id=enable - name=Enable, value=0
                  supported, value=0, maximum=2
                > id=language, name=Language select, address=0xcc, delay=-1ms, 
type=2
                  Possible values:
                        > id=english - name=English, value=2
                        > id=french - name=Français (French), value=3
                        > id=german - name=Deutsch (German), value=4
                        > id=italian - name=Italiano (Italian), value=5
                        > id=spanish - name=Castellano (Spanish), value=10
                        > id=russian - name=Русский (Russian), value=9
                        > id=swedish - name=Svenska (Swedish), value=11
                  supported, value=2, maximum=11
        > Input settings
                > id=autosource, name=Autoselect Input Source, address=0xe2, 
delay=-1ms, type=2
                  Possible values:
                        > id=auto - name=Automatic, value=0
                        > id=manual - name=Manual, value=1
                  supported, value=0, maximum=1
                > id=inputsource, name=Input Source Select, address=0x60, 
delay=-1ms, type=2
                  Possible values:
                        > id=analog - name=Analog, value=1
                        > id=digital - name=Digital, value=3
                  supported, value=3, maximum=3
        > Power control
                > id=dpms, name=DPMS Control, address=0xd6, delay=-1ms, type=2
                  Possible values:
                        > id=on - name=On, value=1
                        > id=standby - name=Standby, value=4
                  supported, value=1, maximum=4
                > id=power, name=Power control, address=0xe1, delay=-1ms, type=2
                  Possible values:
                        > id=off - name=Off, value=0
                        > id=on - name=On, value=1
                  supported, value=1, maximum=1

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