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#26 2025-06-13 21:10:19

seth
Member
Registered: 2012-09-03
Posts: 65,937

Re: GPU crash when playing video on firefox

1. try to disable c-states in the UEFI
2. test a completely different software stack (eg. *slightly* older ubuntu live system) and see whether you get the GPU to reset there. The other thread is pretty similar, so this might actually be a software problem (likely kernel or mesa)

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#27 2025-06-14 19:35:54

prankish
Member
Registered: 2025-06-03
Posts: 19

Re: GPU crash when playing video on firefox

seth wrote:

1. try to disable c-states in the UEFI
2. test a completely different software stack (eg. *slightly* older ubuntu live system) and see whether you get the GPU to reset there. The other thread is pretty similar, so this might actually be a software problem (likely kernel or mesa)

I am not sure if I have C-State in my BIOS. These are the pages with power related settings, is any of this what you mean?
These are two images of the BIOS settings:
- https://0x0.st/86-2.jpg
- https://0x0.st/86-p.jpg

is popOS! 22.04 good? or shall I take ubuntu 22.04? or more recent?

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#28 2025-06-14 20:15:41

seth
Member
Registered: 2012-09-03
Posts: 65,937

Re: GPU crash when playing video on firefox

is popOS! 22.04 good? or shall I take ubuntu 22.04? or more recent?

It really doesn't matter, just make sure that HW acceleration is actually invoked.

Nothing there looks like c-states, ppc-adjustment might be interesting…

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#29 2025-06-15 15:19:14

prankish
Member
Registered: 2025-06-03
Posts: 19

Re: GPU crash when playing video on firefox

seth wrote:

is popOS! 22.04 good? or shall I take ubuntu 22.04? or more recent?

It really doesn't matter, just make sure that HW acceleration is actually invoked.

Nothing there looks like c-states, ppc-adjustment might be interesting…

I ran popOS! 22.04 LTS, and I got interesting results.
- if I ran a youtube video on firefox, it works without a problem. (with hardware acceleration enabled)
- when I ran a video using mpv --hwdec=auto, it crashes.

Last edited by prankish (2025-06-15 19:01:30)

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#30 2025-06-19 13:41:06

seth
Member
Registered: 2012-09-03
Posts: 65,937

Re: GPU crash when playing video on firefox

Means FF on popOS! was likely simply not accelerated?
It also means there is *very* much likely a problem with the hardware. I suspect the moment the APU draws some power and starves the CPU.

Can you cause likewise freezes w/o the video HWA, eg. by running some more demanding GL/vulkan demo? (or game)?
Have you looked into the PPC adjustment setting?

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#31 2025-06-22 18:18:03

prankish
Member
Registered: 2025-06-03
Posts: 19

Re: GPU crash when playing video on firefox

seth wrote:

Means FF on popOS! was likely simply not accelerated?
It also means there is *very* much likely a problem with the hardware. I suspect the moment the APU draws some power and starves the CPU.

Can you cause likewise freezes w/o the video HWA, eg. by running some more demanding GL/vulkan demo? (or game)?
Have you looked into the PPC adjustment setting?

I ran https://benchmark.unigine.com/superposition and https://aur.archlinux.org/packages/gputest, they both ran fine without any crashes.

I look into the PPC adjustment settings and see if I see any differences.

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#32 2025-06-26 15:38:49

seth
Member
Registered: 2012-09-03
Posts: 65,937

Re: GPU crash when playing video on firefox

There's https://bbs.archlinux.org/viewtopic.php?id=306510 - I don't quite yet know how to make sense out of it, but apparently the crash only happens when an external output is in use.
Can you confirm that?

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#33 2025-06-27 17:17:48

prankish
Member
Registered: 2025-06-03
Posts: 19

Re: GPU crash when playing video on firefox

seth wrote:

There's https://bbs.archlinux.org/viewtopic.php?id=306510 - I don't quite yet know how to make sense out of it, but apparently the crash only happens when an external output is in use.
Can you confirm that?

I have tried the different P_States but that didn't change anything.

I have a minipc and only an integrated gpu, so there is only 1 way to connect it to a monitor.

Last edited by prankish (2025-06-27 17:18:37)

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#34 2025-06-27 19:11:26

seth
Member
Registered: 2012-09-03
Posts: 65,937

Re: GPU crash when playing video on firefox

Please check whether the monitor is 10bpc (edid-decode, xrandr --props will list that, too) - do you have another monitor?

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#35 2025-06-28 10:56:56

prankish
Member
Registered: 2025-06-03
Posts: 19

Re: GPU crash when playing video on firefox

seth wrote:

Please check whether the monitor is 10bpc (edid-decode, xrandr --props will list that, too) - do you have another monitor?

I am using a single monitor

❯ find /sys/class/drm/*/edid -exec edid-decode {} \; 2>/dev/null
EDID of '/sys/class/drm/card1-DP-1/edid' was empty.
EDID of '/sys/class/drm/card1-DP-2/edid' was empty.
EDID of '/sys/class/drm/card1-DP-3/edid' was empty.
EDID of '/sys/class/drm/card1-DP-4/edid' was empty.
EDID of '/sys/class/drm/card1-DP-5/edid' was empty.
EDID of '/sys/class/drm/card1-DP-6/edid' was empty.
EDID of '/sys/class/drm/card1-DP-7/edid' was empty.
edid-decode (hex):

00 ff ff ff ff ff ff 00 10 ac 96 a1 4c 43 49 30
0c 1f 01 03 80 3c 22 78 ea 50 95 a8 54 4e a5 26
0f 50 54 a5 4b 00 71 4f 81 80 a9 c0 a9 40 d1 c0
e1 00 01 01 01 01 08 e8 00 30 f2 70 5a 80 b0 58
8a 00 55 50 21 00 00 1e 00 00 00 ff 00 43 36 50
31 4d 34 33 0a 20 20 20 20 20 00 00 00 fc 00 44
45 4c 4c 20 53 32 37 32 31 51 53 0a 00 00 00 fd
00 28 3c 82 89 3c 00 0a 20 20 20 20 20 20 01 d0

02 03 45 f1 54 61 01 02 03 04 05 06 07 10 11 12
14 15 16 1f 20 21 5d 5e 5f 23 09 07 07 83 01 00
00 6d 03 0c 00 10 00 38 44 20 00 60 03 02 01 67
d8 5d c4 01 78 80 01 e4 0f 01 00 00 68 1a 00 00
01 01 28 3c e6 56 5e 00 a0 a0 a0 29 50 30 20 35
00 55 50 21 00 00 1a 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 2e

----------------

Block 0, Base EDID:
  EDID Structure Version & Revision: 1.3
  Vendor & Product Identification:
    Manufacturer: DEL
    Model: 41366
    Serial Number: 810107724 (0x3049434c)
    Made in: week 12 of 2021
  Basic Display Parameters & Features:
    Digital display
    Maximum image size: 60 cm x 34 cm
    Gamma: 2.20
    DPMS levels: Standby Suspend Off
    RGB color display
    First detailed timing is the preferred timing
  Color Characteristics:
    Red  : 0.6572, 0.3291
    Green: 0.3046, 0.6445
    Blue : 0.1503, 0.0595
    White: 0.3134, 0.3291
  Established Timings I & II:
    IBM     :   720x400    70.081663 Hz   9:5     31.467 kHz     28.320000 MHz
    DMT 0x04:   640x480    59.940476 Hz   4:3     31.469 kHz     25.175000 MHz
    DMT 0x06:   640x480    75.000000 Hz   4:3     37.500 kHz     31.500000 MHz
    DMT 0x09:   800x600    60.316541 Hz   4:3     37.879 kHz     40.000000 MHz
    DMT 0x0b:   800x600    75.000000 Hz   4:3     46.875 kHz     49.500000 MHz
    DMT 0x10:  1024x768    60.003840 Hz   4:3     48.363 kHz     65.000000 MHz
    DMT 0x12:  1024x768    75.028582 Hz   4:3     60.023 kHz     78.750000 MHz
    DMT 0x24:  1280x1024   75.024675 Hz   5:4     79.976 kHz    135.000000 MHz
  Standard Timings:
    DMT 0x15:  1152x864    75.000000 Hz   4:3     67.500 kHz    108.000000 MHz
    DMT 0x23:  1280x1024   60.019740 Hz   5:4     63.981 kHz    108.000000 MHz
    DMT 0x53:  1600x900    60.000000 Hz  16:9     60.000 kHz    108.000000 MHz (RB)
    DMT 0x33:  1600x1200   60.000000 Hz   4:3     75.000 kHz    162.000000 MHz
    DMT 0x52:  1920x1080   60.000000 Hz  16:9     67.500 kHz    148.500000 MHz
    GTF     :  2048x1280   60.000000 Hz  16:10    79.500 kHz    221.328000 MHz
  Detailed Timing Descriptors:
    DTD 1:  3840x2160   60.000000 Hz  16:9    135.000 kHz    594.000000 MHz (597 mm x 336 mm)
                 Hfront  176 Hsync  88 Hback  296 Hpol P
                 Vfront    8 Vsync  10 Vback   72 Vpol P
    Display Product Serial Number: 'C6P1M43'
    Display Product Name: 'DELL S2721QS'
    Display Range Limits:
      Monitor ranges (GTF): 40-60 Hz V, 130-137 kHz H, max dotclock 600 MHz
  Extension blocks: 1
Checksum: 0xd0

----------------

Block 1, CTA-861 Extension Block:
  Revision: 3
  Underscans IT Video Formats by default
  Basic audio support
  Supports YCbCr 4:4:4
  Supports YCbCr 4:2:2
  Native detailed modes: 1
  Video Data Block:
    VIC  97:  3840x2160   60.000000 Hz  16:9    135.000 kHz    594.000000 MHz
    VIC   1:   640x480    59.940476 Hz   4:3     31.469 kHz     25.175000 MHz
    VIC   2:   720x480    59.940060 Hz   4:3     31.469 kHz     27.000000 MHz
    VIC   3:   720x480    59.940060 Hz  16:9     31.469 kHz     27.000000 MHz
    VIC   4:  1280x720    60.000000 Hz  16:9     45.000 kHz     74.250000 MHz
    VIC   5:  1920x1080i  60.000000 Hz  16:9     33.750 kHz     74.250000 MHz
    VIC   6:  1440x480i   59.940060 Hz   4:3     15.734 kHz     27.000000 MHz
    VIC   7:  1440x480i   59.940060 Hz  16:9     15.734 kHz     27.000000 MHz
    VIC  16:  1920x1080   60.000000 Hz  16:9     67.500 kHz    148.500000 MHz
    VIC  17:   720x576    50.000000 Hz   4:3     31.250 kHz     27.000000 MHz
    VIC  18:   720x576    50.000000 Hz  16:9     31.250 kHz     27.000000 MHz
    VIC  20:  1920x1080i  50.000000 Hz  16:9     28.125 kHz     74.250000 MHz
    VIC  21:  1440x576i   50.000000 Hz   4:3     15.625 kHz     27.000000 MHz
    VIC  22:  1440x576i   50.000000 Hz  16:9     15.625 kHz     27.000000 MHz
    VIC  31:  1920x1080   50.000000 Hz  16:9     56.250 kHz    148.500000 MHz
    VIC  32:  1920x1080   24.000000 Hz  16:9     27.000 kHz     74.250000 MHz
    VIC  33:  1920x1080   25.000000 Hz  16:9     28.125 kHz     74.250000 MHz
    VIC  93:  3840x2160   24.000000 Hz  16:9     54.000 kHz    297.000000 MHz
    VIC  94:  3840x2160   25.000000 Hz  16:9     56.250 kHz    297.000000 MHz
    VIC  95:  3840x2160   30.000000 Hz  16:9     67.500 kHz    297.000000 MHz
  Audio Data Block:
    Linear PCM:
      Max channels: 2
      Supported sample rates (kHz): 48 44.1 32
      Supported sample sizes (bits): 24 20 16
  Speaker Allocation Data Block:
    FL/FR - Front Left/Right
  Vendor-Specific Data Block (HDMI), OUI 00-0C-03:
    Source physical address: 1.0.0.0
    DC_36bit
    DC_30bit
    DC_Y444
    Maximum TMDS clock: 340 MHz
    Extended HDMI video details:
      HDMI VICs:
        HDMI VIC 3:  3840x2160   24.000000 Hz  16:9     54.000 kHz    297.000000 MHz
        HDMI VIC 2:  3840x2160   25.000000 Hz  16:9     56.250 kHz    297.000000 MHz
        HDMI VIC 1:  3840x2160   30.000000 Hz  16:9     67.500 kHz    297.000000 MHz
  Vendor-Specific Data Block (HDMI Forum), OUI C4-5D-D8:
    Version: 1
    Maximum TMDS Character Rate: 600 MHz
    SCDC Present
    Supports 10-bits/component Deep Color 4:2:0 Pixel Encoding
  YCbCr 4:2:0 Capability Map Data Block:
    VIC  97:  3840x2160   60.000000 Hz  16:9    135.000 kHz    594.000000 MHz
  Vendor-Specific Data Block (AMD), OUI 00-00-1A:
    Version: 1
    Feature Caps: 0x01
    Minimum Refresh Rate: 40 Hz
    Maximum Refresh Rate: 60 Hz
    Flags 1.x: 0xe6 (MCCS)
  Detailed Timing Descriptors:
    DTD 2:  2560x1440   59.950550 Hz  16:9     88.787 kHz    241.500000 MHz (597 mm x 336 mm)
                 Hfront   48 Hsync  32 Hback   80 Hpol P
                 Vfront    3 Vsync   5 Vback   33 Vpol N
Checksum: 0x2e  Unused space in Extension Block: 40 bytes
EDID of '/sys/class/drm/card1-HDMI-A-2/edid' was empty.
EDID of '/sys/class/drm/card1-Writeback-1/edid' was empty.

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#36 2025-06-28 16:04:15

seth
Member
Registered: 2012-09-03
Posts: 65,937

Re: GPU crash when playing video on firefox

    Supports 10-bits/component Deep Color 4:2:0 Pixel Encoding

No, the idea was whether you've another monitor - instead of a fancy 4k wide-gamut display, maybe some sad 1280x1042 office panel from 2008 or so… the other thread links this very much to that specific monitor and yours is 10bpc capable as well …

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#37 2025-06-28 19:45:51

prankish
Member
Registered: 2025-06-03
Posts: 19

Re: GPU crash when playing video on firefox

seth wrote:
    Supports 10-bits/component Deep Color 4:2:0 Pixel Encoding

No, the idea was whether you've another monitor - instead of a fancy 4k wide-gamut display, maybe some sad 1280x1042 office panel from 2008 or so… the other thread links this very much to that specific monitor and yours is 10bpc capable as well …

I think I might have an old one lying somewhere, I will give it a try and see what I get.

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#38 2025-07-05 10:26:17

prankish
Member
Registered: 2025-06-03
Posts: 19

Re: GPU crash when playing video on firefox

seth wrote:
    Supports 10-bits/component Deep Color 4:2:0 Pixel Encoding

No, the idea was whether you've another monitor - instead of a fancy 4k wide-gamut display, maybe some sad 1280x1042 office panel from 2008 or so… the other thread links this very much to that specific monitor and yours is 10bpc capable as well …

I tried a Samsung 2494HM screen, but I got the same issue.

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#39 2025-07-05 14:21:11

seth
Member
Registered: 2012-09-03
Posts: 65,937

Re: GPU crash when playing video on firefox

Just to be sure, can you post the edid of that monitor as well?

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#40 2025-07-06 13:11:19

prankish
Member
Registered: 2025-06-03
Posts: 19

Re: GPU crash when playing video on firefox

seth wrote:

Just to be sure, can you post the edid of that monitor as well?

I found an even older monitor, but it also crashed.
the edid of the oldest monitor I tried is below

❯ find /sys/class/drm/*/edid -exec edid-decode {} \; 2>/dev/null
EDID of '/sys/class/drm/card1-DP-1/edid' was empty.
EDID of '/sys/class/drm/card1-DP-2/edid' was empty.
EDID of '/sys/class/drm/card1-DP-3/edid' was empty.
EDID of '/sys/class/drm/card1-DP-4/edid' was empty.
EDID of '/sys/class/drm/card1-DP-5/edid' was empty.
EDID of '/sys/class/drm/card1-DP-6/edid' was empty.
EDID of '/sys/class/drm/card1-DP-7/edid' was empty.
edid-decode (hex):

00 ff ff ff ff ff ff 00 4c 2d 6d 07 45 43 32 42
26 14 01 03 80 30 1b 78 2a 78 f1 a6 55 48 9b 26
12 50 54 bf ef 80 71 4f 81 00 81 40 81 80 95 00
95 0f a9 40 b3 00 02 3a 80 18 71 38 2d 40 58 2c
45 00 dd 0c 11 00 00 1e 01 1d 00 72 51 d0 1e 20
6e 28 55 00 dd 0c 11 00 00 1e 00 00 00 fd 00 38
4b 1e 51 11 00 0a 20 20 20 20 20 20 00 00 00 fc
00 53 4d 42 58 32 32 33 31 0a 20 20 20 20 01 39

02 03 1c f1 48 90 04 1f 05 14 13 12 03 23 09 07
07 83 01 00 00 66 03 0c 00 10 00 80 01 1d 80 d0
72 1c 16 20 10 2c 25 80 dd 0c 11 00 00 9e 01 1d
80 18 71 1c 16 20 58 2c 25 00 dd 0c 11 00 00 9e
01 1d 00 bc 52 d0 1e 20 b8 28 55 40 dd 0c 11 00
00 1e 8c 0a d0 90 20 40 31 20 0c 40 55 00 dd 0c
11 00 00 18 8c 0a d0 8a 20 e0 2d 10 10 3e 96 00
dd 0c 11 00 00 18 00 00 00 00 00 00 00 00 00 46

----------------

Block 0, Base EDID:
  EDID Structure Version & Revision: 1.3
  Vendor & Product Identification:
    Manufacturer: SAM
    Model: 1901
    Serial Number: 1110590277 (0x42324345)
    Made in: week 38 of 2010
  Basic Display Parameters & Features:
    Digital display
    Maximum image size: 48 cm x 27 cm
    Gamma: 2.20
    DPMS levels: Off
    RGB color display
    First detailed timing is the preferred timing
  Color Characteristics:
    Red  : 0.6494, 0.3349
    Green: 0.2832, 0.6054
    Blue : 0.1513, 0.0732
    White: 0.3125, 0.3291
  Established Timings I & II:
    IBM     :   720x400    70.081663 Hz   9:5     31.467 kHz     28.320000 MHz
    DMT 0x04:   640x480    59.940476 Hz   4:3     31.469 kHz     25.175000 MHz
    Apple   :   640x480    66.666667 Hz   4:3     35.000 kHz     30.240000 MHz
    DMT 0x05:   640x480    72.808802 Hz   4:3     37.861 kHz     31.500000 MHz
    DMT 0x06:   640x480    75.000000 Hz   4:3     37.500 kHz     31.500000 MHz
    DMT 0x08:   800x600    56.250000 Hz   4:3     35.156 kHz     36.000000 MHz
    DMT 0x09:   800x600    60.316541 Hz   4:3     37.879 kHz     40.000000 MHz
    DMT 0x0a:   800x600    72.187572 Hz   4:3     48.077 kHz     50.000000 MHz
    DMT 0x0b:   800x600    75.000000 Hz   4:3     46.875 kHz     49.500000 MHz
    Apple   :   832x624    74.551266 Hz   4:3     49.726 kHz     57.284000 MHz
    DMT 0x10:  1024x768    60.003840 Hz   4:3     48.363 kHz     65.000000 MHz
    DMT 0x11:  1024x768    70.069359 Hz   4:3     56.476 kHz     75.000000 MHz
    DMT 0x12:  1024x768    75.028582 Hz   4:3     60.023 kHz     78.750000 MHz
    DMT 0x24:  1280x1024   75.024675 Hz   5:4     79.976 kHz    135.000000 MHz
    Apple   :  1152x870    75.061550 Hz 192:145   68.681 kHz    100.000000 MHz
  Standard Timings:
    DMT 0x15:  1152x864    75.000000 Hz   4:3     67.500 kHz    108.000000 MHz
    DMT 0x1c:  1280x800    59.810326 Hz  16:10    49.702 kHz     83.500000 MHz
    DMT 0x20:  1280x960    60.000000 Hz   4:3     60.000 kHz    108.000000 MHz
    DMT 0x23:  1280x1024   60.019740 Hz   5:4     63.981 kHz    108.000000 MHz
    DMT 0x2f:  1440x900    59.887445 Hz  16:10    55.935 kHz    106.500000 MHz
    DMT 0x30:  1440x900    74.984427 Hz  16:10    70.635 kHz    136.750000 MHz
    DMT 0x33:  1600x1200   60.000000 Hz   4:3     75.000 kHz    162.000000 MHz
    DMT 0x3a:  1680x1050   59.954250 Hz  16:10    65.290 kHz    146.250000 MHz
  Detailed Timing Descriptors:
    DTD 1:  1920x1080   60.000000 Hz  16:9     67.500 kHz    148.500000 MHz (477 mm x 268 mm)
                 Hfront   88 Hsync  44 Hback  148 Hpol P
                 Vfront    4 Vsync   5 Vback   36 Vpol P
    DTD 2:  1280x720    60.000000 Hz  16:9     45.000 kHz     74.250000 MHz (477 mm x 268 mm)
                 Hfront  110 Hsync  40 Hback  220 Hpol P
                 Vfront    5 Vsync   5 Vback   20 Vpol P
    Display Range Limits:
      Monitor ranges (GTF): 56-75 Hz V, 30-81 kHz H, max dotclock 170 MHz
    Display Product Name: 'SMBX2231'
  Extension blocks: 1
Checksum: 0x39

----------------

Block 1, CTA-861 Extension Block:
  Revision: 3
  Underscans IT Video Formats by default
  Basic audio support
  Supports YCbCr 4:4:4
  Supports YCbCr 4:2:2
  Native detailed modes: 1
  Video Data Block:
    VIC  16:  1920x1080   60.000000 Hz  16:9     67.500 kHz    148.500000 MHz (native)
    VIC   4:  1280x720    60.000000 Hz  16:9     45.000 kHz     74.250000 MHz
    VIC  31:  1920x1080   50.000000 Hz  16:9     56.250 kHz    148.500000 MHz
    VIC   5:  1920x1080i  60.000000 Hz  16:9     33.750 kHz     74.250000 MHz
    VIC  20:  1920x1080i  50.000000 Hz  16:9     28.125 kHz     74.250000 MHz
    VIC  19:  1280x720    50.000000 Hz  16:9     37.500 kHz     74.250000 MHz
    VIC  18:   720x576    50.000000 Hz  16:9     31.250 kHz     27.000000 MHz
    VIC   3:   720x480    59.940060 Hz  16:9     31.469 kHz     27.000000 MHz
  Audio Data Block:
    Linear PCM:
      Max channels: 2
      Supported sample rates (kHz): 48 44.1 32
      Supported sample sizes (bits): 24 20 16
  Speaker Allocation Data Block:
    FL/FR - Front Left/Right
  Vendor-Specific Data Block (HDMI), OUI 00-0C-03:
    Source physical address: 1.0.0.0
    Supports_AI
  Detailed Timing Descriptors:
    DTD 3:  1920x1080i  50.000000 Hz  16:9     28.125 kHz     74.250000 MHz (477 mm x 268 mm)
                 Hfront  528 Hsync  44 Hback  148 Hpol P
                 Vfront    2 Vsync   5 Vback   15 Vpol P Vfront +0.5 Odd Field
                 Vfront    2 Vsync   5 Vback   15 Vpol P Vback  +0.5 Even Field
    DTD 4:  1920x1080i  60.000000 Hz  16:9     33.750 kHz     74.250000 MHz (477 mm x 268 mm)
                 Hfront   88 Hsync  44 Hback  148 Hpol P
                 Vfront    2 Vsync   5 Vback   15 Vpol P Vfront +0.5 Odd Field
                 Vfront    2 Vsync   5 Vback   15 Vpol P Vback  +0.5 Even Field
    DTD 5:  1280x720    50.000000 Hz  16:9     37.500 kHz     74.250000 MHz (477 mm x 268 mm)
                 Hfront  440 Hsync  40 Hback  220 Hpol P
                 Vfront    5 Vsync   5 Vback   20 Vpol P
    DTD 6:   720x576    50.000000 Hz   5:4     31.250 kHz     27.000000 MHz (477 mm x 268 mm)
                 Hfront   12 Hsync  64 Hback   68 Hpol N
                 Vfront    5 Vsync   5 Vback   39 Vpol N
    DTD 7:   720x480    59.940060 Hz   3:2     31.469 kHz     27.000000 MHz (477 mm x 268 mm)
                 Hfront   16 Hsync  62 Hback   60 Hpol N
                 Vfront    9 Vsync   6 Vback   30 Vpol N
Checksum: 0x46  Unused space in Extension Block: 9 bytes
EDID of '/sys/class/drm/card1-HDMI-A-2/edid' was empty.
EDID of '/sys/class/drm/card1-Writeback-1/edid' was empty.

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