https://bugzilla.kernel.org/show_bug.cgi?id=85421 --- Comment #35 from EmanueL Czirai <emanueLczirai@xxxxxxxxxxxxx> --- I retried with the sole purpose of reproducing: I plugged in (FSC)webcam while vlc was running, opened Media->Capture Device, selected Video Device name /dev/video0 (i think), Advanced Options, Width: 800, Height: 600, (this was working the last time, but probably as 640x480), hit Ok, then Play, at this time, a 640x480 black vlc window appeared and everything froze, the mouse was still moving(i think) and after a few seconds screen went black(forgot if with backlight or not) then I proceeded to ctrl+alt+del and that's how i saved the log. I didn't unplug the usb webcam this time, so there are no v4l2_release stacktraces anymore. Mar 24 15:15:21 manji kernel: ehci-pci 0000:00:12.2: restoring config space at offset 0x4 (was 0x2b00000, writing 0x2b00012) Mar 24 15:15:21 manji kernel: ehci-pci 0000:00:12.2: PME# disabled Mar 24 15:15:21 manji kernel: ehci-pci 0000:00:12.2: enabling bus mastering Mar 24 15:15:21 manji kernel: device: 'ep_81': device_add Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: ring 0 stalled for more than 10163msec Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: GPU lockup (current fence id 0x000000000002ea19 last fence id 0x000000000002ea20 on ring 0) Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: Saved 226 dwords of commands on ring 0. Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: GPU softreset: 0x0000000D Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: GRBM_STATUS = 0xF5702828 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: GRBM_STATUS_SE0 = 0xFC000005 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: GRBM_STATUS_SE1 = 0x00000007 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: SRBM_STATUS = 0x20000840 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: SRBM_STATUS2 = 0x00000000 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: R_008674_CP_STALLED_STAT1 = 0x00000000 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: R_008678_CP_STALLED_STAT2 = 0x400C0000 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: R_00867C_CP_BUSY_STAT = 0x00048002 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: R_008680_CP_STAT = 0x80268647 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: R_00D034_DMA_STATUS_REG = 0x44483106 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: GRBM_SOFT_RESET=0x00007F6B Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: SRBM_SOFT_RESET=0x00100100 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: GRBM_STATUS = 0x00003828 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: GRBM_STATUS_SE0 = 0x00000007 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: GRBM_STATUS_SE1 = 0x00000007 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: SRBM_STATUS = 0x20000040 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: SRBM_STATUS2 = 0x00000000 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: R_008674_CP_STALLED_STAT1 = 0x00000000 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: R_008678_CP_STALLED_STAT2 = 0x00000000 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: R_00867C_CP_BUSY_STAT = 0x00000000 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: R_008680_CP_STAT = 0x00000000 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: R_00D034_DMA_STATUS_REG = 0x44C83D57 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: GPU reset succeeded, trying to resume Mar 24 15:15:32 manji kernel: [drm] Found smc ucode version: 0x00011100 Mar 24 15:15:32 manji kernel: [drm] PCIE GART of 1024M enabled (table at 0x0000000000274000). Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: WB enabled Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: fence driver on ring 0 use gpu addr 0x0000000020000c00 and cpu addr 0xffff8804099a5c00 Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: fence driver on ring 3 use gpu addr 0x0000000020000c0c and cpu addr 0xffff8804099a5c0c Mar 24 15:15:32 manji kernel: radeon 0000:00:01.0: fence driver on ring 5 use gpu addr 0x0000000000072118 and cpu addr 0xffffc90005d32118 Mar 24 15:15:32 manji kernel: [drm] ring test on 0 succeeded in 1 usecs Mar 24 15:15:32 manji kernel: [drm] ring test on 3 succeeded in 3 usecs Mar 24 15:15:32 manji kernel: [drm] ring test on 5 succeeded in 1 usecs Mar 24 15:15:33 manji kernel: [drm] UVD initialized successfully. Mar 24 15:15:33 manji kernel: [drm:radeon_dp_link_train] *ERROR* displayport link status failed Mar 24 15:15:33 manji kernel: [drm:radeon_dp_link_train] *ERROR* clock recovery failed Mar 24 15:15:33 manji kernel: [drm] ib test on ring 0 succeeded in 0 usecs Mar 24 15:15:33 manji kernel: [drm] ib test on ring 3 succeeded in 0 usecs Mar 24 15:15:33 manji kernel: i2c i2c-8: master_xfer[0] W, addr=0x50, len=1 Mar 24 15:15:33 manji kernel: i2c i2c-8: master_xfer[1] R, addr=0x50, len=8 Mar 24 15:15:33 manji kernel: [drm] ib test on ring 5 succeeded Mar 24 15:15:35 manji kernel: r8169 0000:01:00.0 net0: link down Mar 24 15:15:41 manji kernel: r8169 0000:01:00.0: PME# enabled Mar 24 15:15:44 manji kernel: radeon 0000:00:01.0: ring 0 stalled for more than 10490msec Mar 24 15:15:44 manji kernel: radeon 0000:00:01.0: GPU lockup (current fence id 0x000000000002ea3a last fence id 0x000000000002ea76 on ring 0) Mar 24 15:15:44 manji kernel: radeon 0000:00:01.0: ring 0 stalled for more than 10990msec Mar 24 15:15:44 manji kernel: radeon 0000:00:01.0: GPU lockup (current fence id 0x000000000002ea3a last fence id 0x000000000002ea76 on ring 0) Mar 24 15:15:45 manji kernel: radeon 0000:00:01.0: ring 0 stalled for more than 11490msec Mar 24 15:15:45 manji kernel: radeon 0000:00:01.0: GPU lockup (current fence id 0x000000000002ea3a last fence id 0x000000000002ea76 on ring 0) Mar 24 15:15:45 manji kernel: radeon 0000:00:01.0: ring 0 stalled for more than 11990msec Mar 24 15:15:45 manji kernel: radeon 0000:00:01.0: GPU lockup (current fence id 0x000000000002ea3a last fence id 0x000000000002ea76 on ring 0) Mar 24 15:15:46 manji kernel: radeon 0000:00:01.0: ring 0 stalled for more than 12490msec Mar 24 15:15:46 manji kernel: radeon 0000:00:01.0: GPU lockup (current fence id 0x000000000002ea3a last fence id 0x000000000002ea76 on ring 0) Mar 24 15:15:46 manji kernel: radeon 0000:00:01.0: ring 0 stalled for more than 12990msec Mar 24 15:15:46 manji kernel: radeon 0000:00:01.0: GPU lockup (current fence id 0x000000000002ea3a last fence id 0x000000000002ea76 on ring 0) Mar 24 15:15:47 manji kernel: radeon 0000:00:01.0: ring 0 stalled for more than 13490msec Mar 24 15:15:47 manji kernel: radeon 0000:00:01.0: GPU lockup (current fence id 0x000000000002ea3a last fence id 0x000000000002ea76 on ring 0) Mar 24 15:15:47 manji kernel: radeon 0000:00:01.0: ring 0 stalled for more than 13990msec Mar 24 15:15:47 manji kernel: radeon 0000:00:01.0: GPU lockup (current fence id 0x000000000002ea3a last fence id 0x000000000002ea76 on ring 0) Mar 24 15:15:48 manji kernel: radeon 0000:00:01.0: ring 0 stalled for more than 14490msec Mar 24 15:15:48 manji kernel: radeon 0000:00:01.0: GPU lockup (current fence id 0x000000000002ea3a last fence id 0x000000000002ea76 on ring 0) Mar 24 15:15:48 manji kernel: radeon 0000:00:01.0: ring 0 stalled for more than 14990msec Mar 24 15:15:48 manji kernel: radeon 0000:00:01.0: GPU lockup (current fence id 0x000000000002ea3a last fence id 0x000000000002ea76 on ring 0) Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: Saved 1906 dwords of commands on ring 0. Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: GPU softreset: 0x00000009 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: GRBM_STATUS = 0xF5702828 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: GRBM_STATUS_SE0 = 0xFC000005 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: GRBM_STATUS_SE1 = 0x00000007 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: SRBM_STATUS = 0x20000840 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: SRBM_STATUS2 = 0x00000000 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: R_008674_CP_STALLED_STAT1 = 0x00000000 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: R_008678_CP_STALLED_STAT2 = 0x400C0000 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: R_00867C_CP_BUSY_STAT = 0x00048002 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: R_008680_CP_STAT = 0x80268647 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: R_00D034_DMA_STATUS_REG = 0x44C83D57 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: GRBM_SOFT_RESET=0x00007F6B Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: SRBM_SOFT_RESET=0x00000100 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: GRBM_STATUS = 0x00003828 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: GRBM_STATUS_SE0 = 0x00000007 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: GRBM_STATUS_SE1 = 0x00000007 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: SRBM_STATUS = 0x20000040 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: SRBM_STATUS2 = 0x00000000 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: R_008674_CP_STALLED_STAT1 = 0x00000000 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: R_008678_CP_STALLED_STAT2 = 0x00000000 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: R_00867C_CP_BUSY_STAT = 0x00000000 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: R_008680_CP_STAT = 0x00000000 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: R_00D034_DMA_STATUS_REG = 0x44C83D57 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: GPU reset succeeded, trying to resume Mar 24 15:15:49 manji kernel: [drm] Found smc ucode version: 0x00011100 Mar 24 15:15:49 manji kernel: [drm] PCIE GART of 1024M enabled (table at 0x0000000000274000). Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: WB enabled Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: fence driver on ring 0 use gpu addr 0x0000000020000c00 and cpu addr 0xffff8804099a5c00 Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: fence driver on ring 3 use gpu addr 0x0000000020000c0c and cpu addr 0xffff8804099a5c0c Mar 24 15:15:49 manji kernel: radeon 0000:00:01.0: fence driver on ring 5 use gpu addr 0x0000000000072118 and cpu addr 0xffffc90005d32118 Mar 24 15:15:49 manji kernel: [drm] ring test on 0 succeeded in 1 usecs Mar 24 15:15:49 manji kernel: [drm] ring test on 3 succeeded in 3 usecs Mar 24 15:15:49 manji kernel: [drm] ring test on 5 succeeded in 1 usecs Mar 24 15:15:49 manji kernel: [drm] UVD initialized successfully. Mar 24 15:15:49 manji kernel: [drm:radeon_dp_link_train] *ERROR* displayport link status failed Mar 24 15:15:49 manji kernel: [drm:radeon_dp_link_train] *ERROR* clock recovery failed Mar 24 15:15:49 manji kernel: [drm] ib test on ring 0 succeeded in 0 usecs Mar 24 15:15:49 manji kernel: [drm] ib test on ring 3 succeeded in 0 usecs Mar 24 15:15:49 manji kernel: i2c i2c-8: master_xfer[0] W, addr=0x50, len=1 Mar 24 15:15:49 manji kernel: i2c i2c-8: master_xfer[1] R, addr=0x50, len=8 Mar 24 15:15:49 manji kernel: [drm] ib test on ring 5 succeeded Mar 24 15:15:50 manji systemd[1]: Starting Getty on tty2... Mar 24 15:15:50 manji systemd[1]: Started Getty on tty2. Mar 24 15:15:50 manji acpid[2529]: client 3299[1000:100] has disconnected Mar 24 15:15:50 manji systemd[1]: Received SIGINT. ... at this point rebooting was in progress And I also had added radeon.hard_reset=1 at kernel cmdline (since my last dmesg) because I saw in another bug that that helped someone fix it, but apparently not for me. Mar 24 14:40:57 manji kernel: Linux version 4.0.0-rc5-gbc465aa (emacs@manji) (gcc version 4.9.2 20150304 (prerelease) (GCC) ) #56 SMP Mon Mar 23 14:50:12 CET 2015 Mar 24 14:40:57 manji kernel: Command line: BOOT_IMAGE=/vmlinuz-linux-git root=UUID=bfa4ab6e-19a3-4601-ba2b-267c55841c73 rw cryptdevice=/dev/disk/by-uuid/70c08890-417a-497d-b6ab-c0d0357a63e2:cryptManjaro:allow-discards ipv6.disable=1 pnp.debug=1 loglevel=9 log_buf_len=10M printk.always_kmsg_dump=y printk.time=y mminit_loglevel=0 memory_corruption_check=1 fbcon=scrollback:4096k fbcon=font:ProFont6x11 apic=debug earlyprintk=vga dynamic_debug.verbose=1 "dyndbg=file arch/x86/kernel/apic/* +pflmt ; file drivers/video/* +pflmt ; file drivers/acpi/* +pflmt" i8042.debug acpi_backlight=vendor radeon.hard_reset=1 I am willing to test patches or any suggestions... i have time. 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