I have checked ppa mainline kernel 5.4.14 and 5.6 with the same resume from hibernate problematic behavior(The i915 drivers are updated there).
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1877476 Title: HP 820 G3 resume from hibernation hangs with color bars Status in linux package in Ubuntu: Confirmed Bug description: Ubuntu 5.4.0-29.33-generic 5.4.30 I am using Legacy mode in BIOS to boot laptop. I hibernate (I tried "systemctl hibernate" and "sudo hibernate") to swap file (allocated size 18GB what is 2GB more than my RAM size) and both methods hibernates to file OK. After hibernation I want to resume. First resume always ends suspended on color bars after ca 1 min and 2 times backlighted screen meantime. Keyboard driver can accept CTL+ALT+DEL to restart or I can power off and power on again. Second restart always loads grub normally and after I choose default ooot option it correctly resumes from swap file but it should work in this way from the first resume try. I've tried updated grub with options: nosplash, noquiet, nomodeset and even keeping shift in BIOS to see what's going during failed resume but no success. nomodeset option doesn't show color bars, but finishes with backlighted black screen only. Keeping shift in BIOS shows: " RUB loading" without G but after minute it ends on blank backlighted screen. Keeping ESC doesn't help to see any line from boot even nosplash and noquiet is active. Normal suspend and resume from suspend works but hibernation not. Only dmesg line is concerning, but I think nomodeset should eliminate if it would be i915 problem. [ 10.015720] i915 0000:00:02.0: [drm:intel_dp_aux_init_backlight_funcs [i915]] Panel advertises DPCD backlight support, but VBT disagrees. If your backlight controls don't work try booting with i915.enable_dpcd_backlight=1. If your machine needs this, please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel Anyway backlight controls is working OK without nomodeset option. HP BIOS is updated from 01/05/2020 and laptop is about 4 years old. System: Host: UB820 Kernel: 5.4.0-29-generic x86_64 bits: 64 Desktop: Gnome 3.36.1 Distro: Ubuntu 20.04 LTS (Focal Fossa) Machine: Type: Laptop System: HP product: HP EliteBook 820 G3 v: N/A serial: <superuser/root required> Mobo: HP model: 807C v: KBC Version 85.79 serial: <superuser/root required> UEFI [Legacy]: HP v: N75 Ver. 01.45 date: 01/05/2020 Battery: ID-1: BAT0 charge: 34.0 Wh condition: 35.1/35.1 Wh (100%) CPU: Topology: Dual Core model: Intel Core i5-6300U bits: 64 type: MT MCP L2 cache: 3072 KiB Speed: 800 MHz min/max: 400/3000 MHz Core speeds (MHz): 1: 800 2: 800 3: 800 4: 800 Graphics: Device-1: Intel Skylake GT2 [HD Graphics 520] driver: i915 v: kernel Display: x11 server: X.Org 1.20.8 driver: vesa unloaded: fbdev,modesetting resolution: 1366x768~60Hz OpenGL: renderer: Mesa Intel HD Graphics 520 (SKL GT2) v: 4.6 Mesa 20.0.4 Audio: Device-1: Intel Sunrise Point-LP HD Audio driver: snd_hda_intel Sound Server: ALSA v: k5.4.0-29-generic Network: Device-1: Intel Ethernet I219-LM driver: e1000e IF: enp0s31f6 state: down mac: XX:XX:XX:XX:XX:XX Device-2: Intel Wireless 8260 driver: iwlwifi IF: wlp2s0 state: up mac: XX:XX:XX:XX:XX:XX Device-3: HP HP lt4120 Snapdragon X5 LTE type: USB driver: cdc_ether IF: enxda94de160772 state: up speed: N/A duplex: N/A mac: XX:XX:XX:XX:XX:XX Drives: Local Storage: total: 704.24 GiB used: 26.12 GiB (3.7%) ID-1: /dev/sda vendor: Samsung model: SSD 860 EVO 500GB size: 465.76 GiB ID-2: /dev/sdb vendor: Samsung model: MZNLN256HCHP-000H1 size: 238.47 GiB Partition: ID-1: / size: 457.45 GiB used: 26.12 GiB (5.7%) fs: ext4 dev: /dev/sda1 Sensors: System Temperatures: cpu: 38.5 C mobo: 0.0 C Fan Speeds (RPM): N/A To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1877476/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
