[Bug 2142389] Re: amdgpu (R9 380) fails to resume from suspend (deep sleep) – black screen, requires hard reboot

Different Tonga hardware and a different trigger, same newer-kernel breakage. Hardware: Apple iMac17,1 (late 2015), AMD R9 M395/M395X Mac Edition (Tonga) [1002:6920], subsystem Apple [106b:014c], internal eDP 5K panel, no external displays. GNOME/Mutter Wayland session (Ubuntu defaults) in all tests. Results on identical hardware: - Ubuntu 22.04 and 24.04 GA kernels (through 6.8): stable — daily driver for years, zero amdgpu errors. - 6.17.0-35 (24.04 HWE): hard GPU hang under sustained CPU load (no video decode active): ring uvd timeout → "atombios stuck in loop for more than 20secs aborting" (tables E57E, B916) → GPU Recovery Failed: -22 → ring sdma1 timeout → kworkers blocked >122s..>737s → power-off required. - 7.0 (26.04): freezes within seconds of launching GPU-accelerated apps; TTY unresponsive. amdgpu.dc=0 helps but freezes still occur, with call traces in the legacy path: dce_v10_0_crtc_disable → amdgpu_dpm_compute_clocks → smu7_send_msg_to_smc / phm_wait_for_register_unequal, repeating at ~5 s intervals. This looks like a different mechanism than the slow-wake EDID issue discussed in drm/amd#5123: no suspend or DPMS involved, no external monitor, and no "No EDID read" anywhere in my logs. Full details and logs upstream: https://gitlab.freedesktop.org/drm/amd/-/work_items/5680. Daily-driver machine, so I can't run development patches, but I can provide further logs and will test any fix once it lands in a release/stable kernel. -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2142389 Title: amdgpu (R9 380) fails to resume from suspend (deep sleep) – black screen, requires hard reboot Status in linux package in Ubuntu: Confirmed Bug description: AMDGPU suspend → display black / no video after resume on Radeon R9 380 (No EDID read) Summary: After system suspend from Zorin OS 18 (Ubuntu 24.10 base, kernel 6.17.0-14), the system sometimes resumes but the display remains black (no signal). System continues running (fans/LEDs active), but monitor shows no output. Only hard reboot restores video. Steps to reproduce: Boot Zorin OS 18 (Ubuntu 24.10 kernel 6.17). Suspend system (e.g., via GNOME “Suspend”). Wait short period. Attempt to resume (mouse/keyboard). System wakes but display either shows garbled video or no output. Observed behavior: System appears not crashed (fans/LEDs/keyboard continue). Screen stays black or displays remnants but no usable video. Sometimes resume works, sometimes fails. Relevant log excerpt: amdgpu 0000:01:00.0: [drm] *ERROR* No EDID read. Hardware: Motherboard: Gigabyte B450 AORUS PRO WIFI CPU: AMD Ryzen 5 5500 GPU: AMD Radeon R9 380 Series (Tonga, amdgpu driver) Software environment: Zorin OS 18 Core (Ubuntu 24.10 base) kernel: 6.17.0-14-generic X11 session Workaround currently applied: Suspend disabled. System remains stable without suspend. Note: Bug appears related to video resume rather than system freeze; display subsystem (EDID handshake) may fail after suspend. Additional info: Similar reports of amdgpu black screen / suspend issues exist (e.g., Launchpad #2141216) and community discussions on black screen resume after suspend for AMD GPUs. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2142389/+subscriptions