On Raspberry Pi si.graphics(cb) returns empty displays[] array

Describe the bug

When using a customized Debian OS image generated by pi-gen running on a Raspberry Pi CM4 with the vc4-kms-v3d display driver, calling si.graphics(cb) returns an empty displays[] array.

The code path is checking whether the OS is a Raspberry Pi using util.isRaspberry() which checks CPU in /proc/cpuinf and util.isRaspbian() which checks for the word "Raspian" in /etc/os-release.

This approach assumes that all Pi's support the tvservice utility, which is a false assumption. tvservice support is controlled by the display driver, not the CPU or OS version.

A few lines lower in the code, there is an alternative path which uses xrandr to get the display data, which does return the needed data. However, that path requires successful use of xdpyinfo and clinfo. If either or both of those utilities are not found, the code returns an empty array.

Recommendations

The code route should be checking for the presence and operation of the packages/tools required to collect the data rather than making assumptions based on the presence of strings in the CPU and OS info files.
When a tool returns unexpected or no results or isn't found, raise an exception that lets the developer know which call failed, and how to install the tool if possible.

To Reproduce Steps to reproduce the behavior:

Generate a custom Raspbian image using pi-gen to create a slimmed down version of Raspbian OS that doesn't have the name "Raspbian" in the OS release.
Load the image onto a CM4 mounted on a carrier board (Like the Waveshare I/O board for CM4s)
Attach displays to the HDMI outputs. I also have a screen attached to my DSI port, but that isn't required to verify this bug.
Update /boot/config.txt to use dtoverlay=vc4-kms-v3d
Create a node 20.11.0 app that imports systeminformation and then outputs Systeminformation.GraphicsData to the console or terminal.

Current Output Current output returns and empty array... console.log(res.displays) => []

Expected behavior The array should be populated with the Displays attached to the board.

Environment:

systeminformation package version: 5.22.0

OS:

$ cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 11 (bullseye)"
NAME="Debian GNU/Linux"
VERSION_ID="11"
VERSION="11 (bullseye)"
VERSION_CODENAME=bullseye
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

Hardware: CM4 on Carrier Board


$ cat /proc/cpuinfo
processor   : 0
BogoMIPS    : 108.00
Features    : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part    : 0xd08
CPU revision    : 3

processor : 1 BogoMIPS : 108.00 Features : fp asimd evtstrm crc32 cpuid CPU implementer : 0x41 CPU architecture: 8 CPU variant : 0x0 CPU part : 0xd08 CPU revision : 3

processor : 2 BogoMIPS : 108.00 Features : fp asimd evtstrm crc32 cpuid CPU implementer : 0x41 CPU architecture: 8 CPU variant : 0x0 CPU part : 0xd08 CPU revision : 3

processor : 3 BogoMIPS : 108.00 Features : fp asimd evtstrm crc32 cpuid CPU implementer : 0x41 CPU architecture: 8 CPU variant : 0x0 CPU part : 0xd08 CPU revision : 3

Hardware : BCM2835 Revision : d03141 Serial : 10000000486b57b1 Model : Raspberry Pi Compute Module 4 Rev 1.1


Output of `npx systeminformation info` command:

$ npx systeminformation info ─────────────── SYSTEMINFORMATION Version: 5.22.0

Operating System: ─────────────── Platform : linux Distro : Debian GNU/Linux Release : 11 Codename : bullseye Kernel : 6.1.21-v8+ Arch : arm64 Hostname : eck-cn-qi02-pi Codepage : UTF-8 Build :

System: ─────────────── Manufacturer : Raspberry Pi Foundation Model : Raspberry Pi Compute Module 4 Rev 1.1 Version : d03141 Virtual : Raspberry : [object Object]

CPU: ─────────────── Manufacturer : Sony UK Brand : BCM2711 Family : Cortex-A72 Model : 3 Stepping : r0p3 Speed : 1.5 Cores : 4 PhysicalCores : 4 PerformanceCores : 4 EfficiencyCores : Processors : 1 Socket : SOC


**Additional context**

Here is the output of the various utilities used by the code route....

$ fbset -s

mode "1024x600" geometry 1024 600 1920 1200 16 timings 0 0 0 0 0 0 0 accel true rgba 5/11,6/5,5/0,0/0 endmode

$ vcgencmd get_mem gpu gpu=76M

$ tvservice -s tvservice is not supported when using the vc4-kms-v3d driver. Similar features are available with standard linux tools such as kmsprint from kms++-utils

$ tvservice -n tvservice is not supported when using the vc4-kms-v3d driver. Similar features are available with standard linux tools such as kmsprint from kms++-utils

$ lspci -vvv 00:00.0 PCI bridge: Broadcom Inc. and subsidiaries BCM2711 PCIe Bridge (rev 20) (prog-if 00 [Normal decode]) Device tree node: /sys/firmware/devicetree/base/scb/pcie@7d500000/pci@0,0 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- SERR- <PERR- INTx- Latency: 0 Interrupt: pin A routed to IRQ 0 Bus: primary=00, secondary=01, subordinate=01, sec-latency=0 I/O behind bridge: 00000000-00000fff [size=4K] Memory behind bridge: c0000000-c00fffff [size=1M] Prefetchable memory behind bridge: 00000000fff00000-00000000000fffff [disabled] Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR- BridgeCtl: Parity- SERR- NoISA- VGA- VGA16- MAbort- >Reset- FastB2B- PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- Capabilities:

01:00.0 USB controller: Etron Technology, Inc. EJ188/EJ198 USB 3.0 Host Controller (prog-if 30 [XHCI]) Subsystem: Etron Technology, Inc. EJ188/EJ198 USB 3.0 Host Controller Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- SERR- <PERR- INTx- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 34 Region 0: Memory at 600000000 (64-bit, non-prefetchable) [size=32K] Capabilities: Kernel driver in use: xhci_hcd

$ clinfo --raw -bash: clinfo: command not found

$ xdpyinfo -bash: xdpyinfo: command not found

$ xrandr --verbose Screen 0: minimum 320 x 200, current 4224 x 1080, maximum 7680 x 7680 HDMI-1 connected 1280x720+1920+0 (0x50) normal (normal left inverted right x axis y axis) 527mm x 296mm Identifier: 0x45 Timestamp: 12435 Subpixel: unknown Gamma: 1.0:1.0:1.0 Brightness: 1.0 Clones: CRTC: 4 CRTCs: 4 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: EDID: 00ffffffffffff004cee201900122019 0121010380160e78eaee95a3544c9926 0f505421080095008180a940d1c00101 010101010101f03c80a070b032403020 3a040f282100001e0000000000000000 00000000000000000000000000fc0053 474e2d444953504c41590a20000000fd 003b3c1e5311000a20202020202001af 020319f14290042309070565030c0010 0083010000e3050000f03c80a070b032 4030203a040f282100001e011d007251 d01e206e2855000f282100001e000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 000000000000000000000000000000c1 Output format: Automatic supported: Automatic, RGB, YCbCr 4:2:2, YCbCr 4:4:4 Broadcast RGB: Automatic supported: Automatic, Full, Limited 16:235 max bpc: 8 range: (8, 12) bottom margin: 0 range: (0, 100) top margin: 0 range: (0, 100) right margin: 0 range: (0, 100) left margin: 0 range: (0, 100) Colorspace: Default supported: Default, SMPTE_170M_YCC, BT709_YCC, XVYCC_601, XVYCC_709, SYCC_601, opYCC_601, opRGB, BT2020_CYCC, BT2020_RGB, BT2020_YCC, DCI-P3_RGB_D65, DCI-P3_RGB_Theater link-status: Good supported: Good, Bad CONNECTOR_ID: 32 supported: 32 non-desktop: 0 range: (0, 1) 1920x1200 (0x49) 156.000MHz +HSync +VSync +preferred h: width 1920 start 1968 end 2000 total 2080 skew 0 clock 75.00KHz v: height 1200 start 1219 end 1229 total 1250 clock 60.00Hz 1920x1080 (0x4a) 148.500MHz -HSync -VSync h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.50KHz v: height 1080 start 1084 end 1089 total 1125 clock 60.00Hz 1920x1080 (0x4b) 148.500MHz +HSync +VSync h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.50KHz v: height 1080 start 1084 end 1089 total 1125 clock 60.00Hz 1920x1080 (0x4c) 148.352MHz +HSync +VSync h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.43KHz v: height 1080 start 1084 end 1089 total 1125 clock 59.94Hz 1600x1200 (0x4d) 162.000MHz +HSync +VSync h: width 1600 start 1664 end 1856 total 2160 skew 0 clock 75.00KHz v: height 1200 start 1201 end 1204 total 1250 clock 60.00Hz 1280x1024 (0x4e) 108.000MHz +HSync +VSync h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 63.98KHz v: height 1024 start 1025 end 1028 total 1066 clock 60.02Hz 1440x900 (0x4f) 88.750MHz +HSync -VSync h: width 1440 start 1488 end 1520 total 1600 skew 0 clock 55.47KHz v: height 900 start 903 end 909 total 926 clock 59.90Hz 1280x720 (0x50) 74.250MHz +HSync +VSync current h: width 1280 start 1390 end 1430 total 1650 skew 0 clock 45.00KHz v: height 720 start 725 end 730 total 750 clock 60.00Hz 1280x720 (0x51) 74.176MHz +HSync +VSync h: width 1280 start 1390 end 1430 total 1650 skew 0 clock 44.96KHz v: height 720 start 725 end 730 total 750 clock 59.94Hz 1024x768 (0x52) 65.000MHz -HSync -VSync h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.36KHz v: height 768 start 771 end 777 total 806 clock 60.00Hz 800x600 (0x53) 40.000MHz +HSync +VSync h: width 800 start 840 end 968 total 1056 skew 0 clock 37.88KHz v: height 600 start 601 end 605 total 628 clock 60.32Hz 640x480 (0x54) 25.200MHz -HSync -VSync h: width 640 start 656 end 752 total 800 skew 0 clock 31.50KHz v: height 480 start 490 end 492 total 525 clock 60.00Hz 640x480 (0x55) 25.175MHz -HSync -VSync h: width 640 start 656 end 752 total 800 skew 0 clock 31.47KHz v: height 480 start 490 end 492 total 525 clock 59.94Hz HDMI-2 connected primary 1920x1080+0+0 (0x56) normal (normal left inverted right x axis y axis) 530mm x 290mm Identifier: 0x46 Timestamp: 12435 Subpixel: unknown Gamma: 1.0:1.0:1.0 Brightness: 1.0 Clones: CRTC: 0 CRTCs: 0 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: EDID: 00ffffffffffff004e14ab0901000000 2a1f0103b4351d7828ee91a3544c9926 0f505421090031404540614081c08180 9500b300454f023a801871382d40582c 450012222100001e000000fd00304b1e 5514000a202020202020000000ff0030 303030303030303030303031000000fc 0053636570747265204632340a2001c1 020325f147901f041303010523090707 8301000067030c0010001828681a0000 0101304be6504480a070382940302035 0000000000001e7f2156aa51001e3046 8f330000000000001ed12640a0608429 303020350000000000001e100e20e030 5819201848120000000000001e781320 18315829203020350000000000001e3b Output format: Automatic supported: Automatic, RGB, YCbCr 4:2:2, YCbCr 4:4:4 Broadcast RGB: Automatic supported: Automatic, Full, Limited 16:235 max bpc: 8 range: (8, 12) bottom margin: 0 range: (0, 100) top margin: 0 range: (0, 100) right margin: 0 range: (0, 100) left margin: 0 range: (0, 100) Colorspace: Default supported: Default, SMPTE_170M_YCC, BT709_YCC, XVYCC_601, XVYCC_709, SYCC_601, opYCC_601, opRGB, BT2020_CYCC, BT2020_RGB, BT2020_YCC, DCI-P3_RGB_D65, DCI-P3_RGB_Theater link-status: Good supported: Good, Bad CONNECTOR_ID: 42 supported: 42 non-desktop: 0 range: (0, 1) 1920x1080 (0x56) 174.880MHz +HSync +VSync current h: width 1920 start 1968 end 2000 total 2080 skew 0 clock 84.08KHz v: height 1080 start 1083 end 1088 total 1121 clock 75.00Hz 1920x1080 (0x4b) 148.500MHz +HSync +VSync h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.50KHz v: height 1080 start 1084 end 1089 total 1125 clock 60.00Hz 1920x1080 (0x57) 148.500MHz +HSync +VSync h: width 1920 start 2448 end 2492 total 2640 skew 0 clock 56.25KHz v: height 1080 start 1084 end 1089 total 1125 clock 50.00Hz 1920x1080 (0x4c) 148.352MHz +HSync +VSync h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.43KHz v: height 1080 start 1084 end 1089 total 1125 clock 59.94Hz 1920x1080i (0x58) 74.250MHz +HSync +VSync Interlace h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 33.75KHz v: height 1080 start 1084 end 1094 total 1125 clock 60.00Hz 1920x1080i (0x59) 74.176MHz +HSync +VSync Interlace h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 33.72KHz v: height 1080 start 1084 end 1094 total 1125 clock 59.94Hz 1680x1050 (0x5a) 119.000MHz +HSync -VSync h: width 1680 start 1728 end 1760 total 1840 skew 0 clock 64.67KHz v: height 1050 start 1053 end 1059 total 1080 clock 59.88Hz 1600x900 (0x5b) 99.370MHz +HSync +VSync h: width 1600 start 1648 end 1680 total 1760 skew 0 clock 56.46KHz v: height 900 start 903 end 908 total 941 clock 60.00Hz 1280x1024 (0x5c) 135.000MHz +HSync +VSync h: width 1280 start 1296 end 1440 total 1688 skew 0 clock 79.98KHz v: height 1024 start 1025 end 1028 total 1066 clock 75.02Hz 1280x1024 (0x4e) 108.000MHz +HSync +VSync h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 63.98KHz v: height 1024 start 1025 end 1028 total 1066 clock 60.02Hz 1440x900 (0x4f) 88.750MHz +HSync -VSync h: width 1440 start 1488 end 1520 total 1600 skew 0 clock 55.47KHz v: height 900 start 903 end 909 total 926 clock 59.90Hz 1280x720 (0x50) 74.250MHz +HSync +VSync h: width 1280 start 1390 end 1430 total 1650 skew 0 clock 45.00KHz v: height 720 start 725 end 730 total 750 clock 60.00Hz 1280x720 (0x5d) 74.250MHz +HSync +VSync h: width 1280 start 1720 end 1760 total 1980 skew 0 clock 37.50KHz v: height 720 start 725 end 730 total 750 clock 50.00Hz 1280x720 (0x51) 74.176MHz +HSync +VSync h: width 1280 start 1390 end 1430 total 1650 skew 0 clock 44.96KHz v: height 720 start 725 end 730 total 750 clock 59.94Hz 1024x768 (0x52) 65.000MHz -HSync -VSync h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.36KHz v: height 768 start 771 end 777 total 806 clock 60.00Hz 800x600 (0x5e) 49.840MHz +HSync +VSync h: width 800 start 848 end 880 total 1080 skew 0 clock 46.15KHz v: height 600 start 603 end 608 total 641 clock 71.99Hz 800x600 (0x5f) 49.500MHz +HSync +VSync h: width 800 start 816 end 896 total 1056 skew 0 clock 46.88KHz v: height 600 start 601 end 604 total 625 clock 75.00Hz 800x600 (0x53) 40.000MHz +HSync +VSync h: width 800 start 840 end 968 total 1056 skew 0 clock 37.88KHz v: height 600 start 601 end 605 total 628 clock 60.32Hz 800x600 (0x60) 36.000MHz +HSync +VSync h: width 800 start 824 end 896 total 1024 skew 0 clock 35.16KHz v: height 600 start 601 end 603 total 625 clock 56.25Hz 720x480 (0x61) 27.027MHz -HSync -VSync h: width 720 start 736 end 798 total 858 skew 0 clock 31.50KHz v: height 480 start 489 end 495 total 525 clock 60.00Hz 720x480 (0x62) 27.000MHz -HSync -VSync h: width 720 start 736 end 798 total 858 skew 0 clock 31.47KHz v: height 480 start 489 end 495 total 525 clock 59.94Hz 640x480 (0x54) 25.200MHz -HSync -VSync h: width 640 start 656 end 752 total 800 skew 0 clock 31.50KHz v: height 480 start 490 end 492 total 525 clock 60.00Hz 640x480 (0x55) 25.175MHz -HSync -VSync h: width 640 start 656 end 752 total 800 skew 0 clock 31.47KHz v: height 480 start 490 end 492 total 525 clock 59.94Hz DSI-1 connected 1024x600+3200+0 (0x63) normal (normal left inverted right x axis y axis) 0mm x 0mm Identifier: 0x47 Timestamp: 12435 Subpixel: unknown Gamma: 1.0:1.0:1.0 Brightness: 1.0 Clones: CRTC: 3 CRTCs: 3 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: link-status: Good supported: Good, Bad CONNECTOR_ID: 48 supported: 48 non-desktop: 0 range: (0, 1) 1024x600 (0x63) 50.000MHz *current h: width 1024 start 1124 end 1224 total 1324 skew 0 clock 37.76KHz v: height 600 start 610 end 620 total 630 clock 59.94Hz

sebhildebrandt / systeminformation

On Raspberry Pi si.graphics(cb) returns empty displays[] array #893