Here's the decoded EDID of the affected monitor on HDMI-1-0:
EDID version: 1.3
Manufacturer: BNQ Model 30926 Serial Number 21573
Made in week 3 of 2015
Digital display
Maximum image size: 53 cm x 30 cm
Gamma: 2.20
DPMS levels: Off
RGB color display
Default (sRGB) color space is primary color space
First detailed timing is preferred timing
Color Characteristics
Red: 0.6416, 0.3339
Green: 0.3339, 0.6240
Blue: 0.1523, 0.0498
White: 0.3134, 0.3291
Established Timings I & II
720x400 70.082 Hz 9:5 31.467 kHz 28.320 MHz (IBM)
640x480 59.940 Hz 4:3 31.469 kHz 25.175 MHz (DMT)
640x480 75.000 Hz 4:3 37.500 kHz 31.500 MHz (DMT)
800x600 60.317 Hz 4:3 37.879 kHz 40.000 MHz (DMT)
800x600 75.000 Hz 4:3 46.875 kHz 49.500 MHz (DMT)
832x624 74.551 Hz 4:3 49.726 kHz 57.284 MHz (Apple)
1024x768 60.004 Hz 4:3 48.363 kHz 65.000 MHz (DMT)
1024x768 75.029 Hz 4:3 60.023 kHz 78.750 MHz (DMT)
1280x1024 75.025 Hz 5:4 79.976 kHz 135.000 MHz (DMT)
1152x870 75.062 Hz 192:145 68.681 kHz 100.000 MHz (Apple)
Standard Timings
1920x1080 60.000 Hz 16:9 67.500 kHz 148.500 MHz (DMT)
1280x720 60.000 Hz 16:9 45.000 kHz 74.250 MHz (DMT)
1280x800 59.810 Hz 16:10 49.702 kHz 83.500 MHz (DMT)
1280x1024 60.020 Hz 5:4 63.981 kHz 108.000 MHz (DMT)
1600x900 60.000 Hz 16:9 60.000 kHz 108.000 MHz (DMT, RB)
1680x1050 59.954 Hz 16:10 65.290 kHz 146.250 MHz (DMT)
Detailed mode: Clock 148.500 MHz, 531 mm x 299 mm
1920 2008 2052 2200 ( 88 44 148)
1080 1084 1089 1125 ( 4 5 36)
+hsync +vsync
VertFreq: 60.000 Hz, HorFreq: 67.500 kHz
Display Product Serial Number: Y1F02711SL0
Display Range Limits
Monitor ranges (GTF): 50-76 Hz V, 30-83 kHz H, max dotclock 170 MHz
Display Product Name: BenQ GL2460
Has 1 extension block
Checksum: 0x86
----------------
CTA-861 Extension Block Revision 3
Underscans PC formats by default
Basic audio support
Supports YCbCr 4:4:4
Supports YCbCr 4:2:2
1 native detailed modes
30 bytes of CTA data blocks
Video Data Block
1920x1080 60.000 Hz 16:9 67.500 kHz 148.500 MHz (VIC 16, native)
1920x1080i 60.000 Hz 16:9 33.750 kHz 74.250 MHz (VIC 5)
1280x720 60.000 Hz 16:9 45.000 kHz 74.250 MHz (VIC 4)
720x480 59.940 Hz 16:9 31.469 kHz 27.000 MHz (VIC 3)
720x480 59.940 Hz 4:3 31.469 kHz 27.000 MHz (VIC 2)
640x480 59.940 Hz 4:3 31.469 kHz 25.175 MHz (VIC 1)
720x576 50.000 Hz 4:3 31.250 kHz 27.000 MHz (VIC 17)
720x576 50.000 Hz 16:9 31.250 kHz 27.000 MHz (VIC 18)
1280x720 50.000 Hz 16:9 37.500 kHz 74.250 MHz (VIC 19)
1920x1080i 50.000 Hz 16:9 28.125 kHz 74.250 MHz (VIC 20)
1440x480i 59.940 Hz 4:3 15.734 kHz 27.000 MHz (VIC 6)
1440x480i 59.940 Hz 16:9 15.734 kHz 27.000 MHz (VIC 7)
1440x576i 50.000 Hz 4:3 15.625 kHz 27.000 MHz (VIC 21)
1440x576i 50.000 Hz 16:9 15.625 kHz 27.000 MHz (VIC 22)
1920x1080 50.000 Hz 16:9 56.250 kHz 148.500 MHz (VIC 31)
Audio Data Block
Linear PCM, max channels 2
Supported sample rates (kHz): 48 44.1 32
Supported sample sizes (bits): 24 20 16
Vendor-Specific Data Block, OUI 0x000c03 (HDMI)
Source physical address 1.0.0.0
Speaker Allocation Data Block
Speaker map:
FL/FR - Front Left/Right
Detailed mode: Clock 148.500 MHz, 531 mm x 299 mm
1920 2008 2052 2200 ( 88 44 148)
1080 1084 1089 1125 ( 4 5 36)
+hsync +vsync
VertFreq: 60.000 Hz, HorFreq: 67.500 kHz
Detailed mode: Clock 74.250 MHz, 531 mm x 299 mm
1920 2008 2052 2200 ( 88 44 148)
540 542 547 562 ( 2 5 15)
+hsync +vsync
VertFreq: 60.000i Hz, HorFreq: 33.750 kHz
Detailed mode: Clock 74.250 MHz, 531 mm x 299 mm
1280 1390 1430 1650 (110 40 220)
720 725 730 750 ( 5 5 20)
+hsync +vsync
VertFreq: 60.000 Hz, HorFreq: 45.000 kHz
Detailed mode: Clock 27.000 MHz, 531 mm x 299 mm
720 736 798 858 ( 16 62 60)
480 489 495 525 ( 9 6 30)
-hsync -vsync
VertFreq: 59.940 Hz, HorFreq: 31.469 kHz
Checksum: 0xe7
** Tags added: amdgpu hybrid nvidia
** Summary changed:
- Second monitor is detected but has no signal
+ [nvidia] [amdgpu] Second monitor is detected but has no signal
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https://bugs.launchpad.net/bugs/1913613
Title:
[nvidia] [amdgpu] Second monitor is detected but has no signal
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