Rocky Linux 9.3 display port stopped working after update

[gospodinbodurov]

My display port (HP EliteBook 8470p) stopped working after the latest update in Rocky Linux. Before that it was working fine.

I tested with two different external displays and no joy. Tested the same displays with Ubuntu 22.04.4 LTS and both are working fine. Ubuntu is updated to the latest version.

Here is some debug data:

---

ddcutil detect --stats errors -v
Invalid display
I2C bus: /dev/i2c-2
DRM connector: card0-LVDS-1
Driver: i915
I2C address 0x50 (EDID) responsive: true
Is eDP device: false
Is LVDS device: false
/sys/bus/i2c/devices/i2c-2/name i915 gmbus panel
PCI device path: /sys/devices/pci0000:00/0000:00:02.0/i2c-2
EDID synopsis:
Mfg id: AUO - UNK
Model:
Product code: 12604 (0x313c)
Serial number:
Binary serial number: 0 (0x00000000)
Manufacture year: 2011, Week: 0
EDID version: 1.4
Extra descriptor:
Video input definition: 0x90 - Digital Input (Digital interface not defined), Bit depth: 6
Supported features:
Digital display type: RGB 4:4:4
Standard sRGB color space: False
White x,y: 0.313, 0.329
Red x,y: 0.590, 0.345
Green x,y: 0.340, 0.570
Blue x,y: 0.150, 0.120
Extension blocks: 0
EDID source: I2C
EDID hex dump:
+0 +4 +8 +c 0 4 8 c
+0000 00 ff ff ff ff ff ff 00 06 af 3c 31 00 00 00 00 ..........<1....
+0010 00 15 01 04 90 1f 11 78 02 10 b5 97 58 57 92 26 .......x....XW.&
+0020 1e 50 54 00 00 00 01 01 01 01 01 01 01 01 01 01 .PT.............
+0030 01 01 01 01 01 01 ce 1d 56 e2 50 00 1e 30 26 16 ........V.P..0&.
+0040 36 00 35 ad 10 00 00 18 df 13 56 e2 50 00 1e 30 6.5.......V.P..0
+0050 26 16 36 00 35 ad 10 00 00 18 00 00 00 00 00 00 &.6.5...........
+0060 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 02 ................
+0070 00 0c 4c ff 0a 3c 64 12 12 1e 65 20 20 20 00 70 ..L..<d...e .p
DDC communication failed
This appears to be a laptop display. Laptop displays do not support DDC/CI.

Invalid display
I2C bus: /dev/i2c-5
Driver: i915
I2C address 0x50 (EDID) responsive: true
Is eDP device: false
Is LVDS device: false
/sys/bus/i2c/devices/i2c-5/name i915 gmbus dpd
PCI device path: /sys/devices/pci0000:00/0000:00:02.0/i2c-5
EDID synopsis:
Mfg id: SNY - Sony
Model: SONY TV
Product code: 59651 (0xe903)
Serial number:
Binary serial number: 16843009 (0x01010101)
Manufacture year: 2016, Week: 1
EDID version: 1.3
Extra descriptor:
Video input definition: 0x80 - Digital Input
Supported features:
Digital display type: RGB 4:4:4 + YCrCb 4:4:4
Standard sRGB color space: False
White x,y: 0.283, 0.298
Red x,y: 0.625, 0.340
Green x,y: 0.280, 0.595
Blue x,y: 0.155, 0.070
Extension blocks: 1
EDID source: I2C
EDID hex dump:
+0 +4 +8 +c 0 4 8 c
+0000 00 ff ff ff ff ff ff 00 4d d9 03 e9 01 01 01 01 ........M.......
+0010 01 1a 01 03 80 a0 5a 78 0a 0d c9 a0 57 47 98 27 ......Zx....WG.'
+0020 12 48 4c 21 08 00 81 80 a9 c0 71 4f b3 00 01 01 .HL!......qO....
+0030 01 01 01 01 01 01 02 3a 80 18 71 38 2d 40 58 2c .......:..q8-@x,
+0040 45 00 40 84 63 00 00 1e 01 1d 00 72 51 d0 1e 20 E.@.c......rQ..
+0050 6e 28 55 00 40 84 63 00 00 1e 00 00 00 fc 00 53 n(U.@.c........S
+0060 4f 4e 59 20 54 56 0a 20 20 20 20 20 00 00 00 fd ONY TV. ....
+0070 00 30 3e 0e 46 0f 00 0a 20 20 20 20 20 20 01 e5 .0>.F... ..
DDC communication failed

EXECUTION STATISTICS

DDC Related Errors:

Count Status Code Description
2 ENXIO ( -6) No such device or address
Total errors: 2

Errors Wrapped in Retry:

Count Status Code Description
2 ENXIO ( -6) No such device or address
Total errors: 2

---

uname -a
Linux localhost.localdomain 5.14.0-362.24.1.el9_3.0.1.x86_64 #1 SMP PREEMPT_DYNAMIC Thu Apr 4 22:31:43 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux

---

cat /etc/os-release
NAME="Rocky Linux"
VERSION="9.3 (Blue Onyx)"
ID="rocky"
ID_LIKE="rhel centos fedora"
VERSION_ID="9.3"
PLATFORM_ID="platform:el9"
PRETTY_NAME="Rocky Linux 9.3 (Blue Onyx)"
ANSI_COLOR="0;32"
LOGO="fedora-logo-icon"
CPE_NAME="cpe:/o:rocky:rocky:9::baseos"
HOME_URL="https://rockylinux.org/"
BUG_REPORT_URL="https://bugs.rockylinux.org/"
SUPPORT_END="2032-05-31"
ROCKY_SUPPORT_PRODUCT="Rocky-Linux-9"
ROCKY_SUPPORT_PRODUCT_VERSION="9.3"
REDHAT_SUPPORT_PRODUCT="Rocky Linux"
REDHAT_SUPPORT_PRODUCT_VERSION="9.3"

---

lspci -k | grep -EA3 'VGA|3D|Display'
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
DeviceName: 64
Subsystem: Hewlett-Packard Company Device 179b
Kernel driver in use: i915

[rockowitz]

Please execute ddcutil interrogate and submit the output as an attachment of some sort, not inline.

[gospodinbodurov]

After latest update it started working again.

Guess the SELinux permissions got messed up somehow. Will report if it pops up again.

Thank you!