Hi folks, commit in $Subject breaks rebooting an HP laptop here with a Carrizo chipset: after typing "reboot" and pressing Enter, it powers off the machine up to a certain point but the fans remain on, screen goes black and nothing happens anymore. No reboot. I have to power it off by holding the power key down for 4 seconds. Reverting the patch fixes the issue. GPU info on that machine: [ 1.462214] [drm] amdgpu kernel modesetting enabled. [ 1.465150] amdgpu 0000:00:01.0: vgaarb: deactivate vga console [ 1.466259] Console: switching to colour dummy device 80x25 [ 1.466844] [drm] initializing kernel modesetting (CARRIZO 0x1002:0x9874 0x103C:0x807E 0xC4). [ 1.467242] amdgpu 0000:00:01.0: amdgpu: Trusted Memory Zone (TMZ) feature not supported [ 1.467552] [drm] register mmio base: 0xD0C00000 [ 1.467750] [drm] register mmio size: 262144 [ 1.467901] [drm] add ip block number 0 <vi_common> [ 1.468067] [drm] add ip block number 1 <gmc_v8_0> [ 1.468266] [drm] add ip block number 2 <cz_ih> [ 1.468436] [drm] add ip block number 3 <gfx_v8_0> [ 1.468603] [drm] add ip block number 4 <sdma_v3_0> [ 1.468809] [drm] add ip block number 5 <powerplay> [ 1.468975] [drm] add ip block number 6 <dm> [ 1.469120] [drm] add ip block number 7 <uvd_v6_0> [ 1.469282] [drm] add ip block number 8 <vce_v3_0> [ 1.485350] [drm] BIOS signature incorrect 20 7 [ 1.485494] resource sanity check: requesting [mem 0x000c0000-0x000dffff], which spans more than PCI Bus 0000:00 [mem 0x000c0000- 0x000c3fff window] [ 1.485922] caller pci_map_rom+0x68/0x1b0 mapping multiple BARs [ 1.486273] amdgpu 0000:00:01.0: amdgpu: Fetched VBIOS from ROM BAR [ 1.486488] amdgpu: ATOM BIOS: SWBRT27354.001 [ 1.486701] [drm] UVD is enabled in physical mode [ 1.486862] [drm] VCE enabled in physical mode [ 1.487061] [drm] vm size is 64 GB, 2 levels, block size is 10-bit, fragment size is 9-bit [ 1.487339] amdgpu 0000:00:01.0: amdgpu: VRAM: 512M 0x000000F400000000 - 0x000000F41FFFFFFF (512M used) [ 1.487652] amdgpu 0000:00:01.0: amdgpu: GART: 1024M 0x000000FF00000000 - 0x000000FF3FFFFFFF [ 1.487939] [drm] Detected VRAM RAM=512M, BAR=512M [ 1.488101] [drm] RAM width 128bits UNKNOWN [ 1.488309] [drm] amdgpu: 512M of VRAM memory ready [ 1.488522] [drm] amdgpu: 3072M of GTT memory ready. [ 1.488707] [drm] GART: num cpu pages 262144, num gpu pages 262144 [ 1.488997] [drm] PCIE GART of 1024M enabled (table at 0x000000F400900000). [ 1.491962] amdgpu: hwmgr_sw_init smu backed is smu8_smu [ 1.492544] [drm] Found UVD firmware Version: 1.91 Family ID: 11 [ 1.492764] [drm] UVD ENC is disabled [ 1.494177] [drm] Found VCE firmware Version: 52.4 Binary ID: 3 [ 1.495765] amdgpu: smu version 18.62.00 [ 1.501983] [drm] DM_PPLIB: values for Engine clock [ 1.502201] [drm] DM_PPLIB: 300000 [ 1.502321] [drm] DM_PPLIB: 360000 [ 1.502441] [drm] DM_PPLIB: 423530 [ 1.502561] [drm] DM_PPLIB: 514290 [ 1.502680] [drm] DM_PPLIB: 626090 [ 1.502799] [drm] DM_PPLIB: 720000 [ 1.502919] [drm] DM_PPLIB: Validation clocks: [ 1.503069] [drm] DM_PPLIB: engine_max_clock: 72000 [ 1.503242] [drm] DM_PPLIB: memory_max_clock: 80000 [ 1.503415] [drm] DM_PPLIB: level : 8 [ 1.503578] [drm] DM_PPLIB: values for Display clock [ 1.503745] [drm] DM_PPLIB: 300000 [ 1.503864] [drm] DM_PPLIB: 400000 [ 1.503984] [drm] DM_PPLIB: 496560 [ 1.504147] [drm] DM_PPLIB: 626090 [ 1.504275] [drm] DM_PPLIB: 685720 [ 1.504403] [drm] DM_PPLIB: 757900 [ 1.504526] [drm] DM_PPLIB: Validation clocks: [ 1.504678] [drm] DM_PPLIB: engine_max_clock: 72000 [ 1.504891] [drm] DM_PPLIB: memory_max_clock: 80000 [ 1.505063] [drm] DM_PPLIB: level : 8 [ 1.505225] [drm] DM_PPLIB: values for Memory clock [ 1.505389] [drm] DM_PPLIB: 333000 [ 1.505508] [drm] DM_PPLIB: 800000 [ 1.505628] [drm] DM_PPLIB: Validation clocks: [ 1.505777] [drm] DM_PPLIB: engine_max_clock: 72000 [ 1.505950] [drm] DM_PPLIB: memory_max_clock: 80000 [ 1.506123] [drm] DM_PPLIB: level : 8 [ 1.506375] [drm] Display Core initialized with v3.2.149! [ 1.584817] [drm] UVD initialized successfully. [ 1.784234] [drm] VCE initialized successfully. [ 1.784415] amdgpu 0000:00:01.0: amdgpu: SE 1, SH per SE 1, CU per SH 8, active_cu_number 8 [ 1.787958] [drm] fb mappable at 0xA0EE4000 [ 1.788118] [drm] vram apper at 0xA0000000 [ 1.788258] [drm] size 14745600 [ 1.788367] [drm] fb depth is 24 [ 1.788503] [drm] pitch is 10240 [ 1.789198] fbcon: amdgpu (fb0) is primary device [ 1.880014] Console: switching to colour frame buffer device 320x90 [ 1.903779] amdgpu 0000:00:01.0: [drm] fb0: amdgpu frame buffer device [ 1.918353] [drm] Initialized amdgpu 3.42.0 20150101 for 0000:00:01.0 on minor 0 -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette