Currently my Tonga (AMD R9 380X) has problems due to the outdated firmwares in the package sys-kernel/linux-firmware. I have version sys-kernel/linux-firmware-9999 installed. The same issue is described in detail upstream: https://bugzilla.kernel.org/show_bug.cgi?id=192921 Updating the amdgpu firmware might also fix bug 606710 or even bug 600286. Here is my dmesg: > ... > [ 0.930887] amdgpu 0000:01:00.0: fence driver on ring 11 use gpu addr 0x000000000102bf40, cpu addr 0xffffc9000484ef40 > [ 0.930893] [drm] Found VCE firmware Version: 52.8 Binary ID: 3 > [ 0.930959] amdgpu 0000:01:00.0: fence driver on ring 12 use gpu addr 0x00000001000000c8, cpu addr 0xffff88045c2e90c8 > [ 0.930991] amdgpu 0000:01:00.0: fence driver on ring 13 use gpu addr 0x00000001000000d8, cpu addr 0xffff88045c2e90d8 > [ 0.931023] amdgpu 0000:01:00.0: fence driver on ring 14 use gpu addr 0x00000001000000e8, cpu addr 0xffff88045c2e90e8 > [ 0.959895] amdgpu 0000:01:00.0: Direct firmware load for amdgpu/tonga_k_smc.bin failed with error -2 > [ 0.959900] [drm:amdgpu_cgs_get_firmware_info] *ERROR* Failed to request firmware > [ 0.960233] [ powerplay ] SMU Firmware start failed > [ 0.960234] [ powerplay ] smc start failed > [ 0.960238] [drm:amdgpu_device_init] *ERROR* hw_init of IP block <amdgpu_powerplay> failed -22 > [ 0.960240] amdgpu 0000:01:00.0: amdgpu_init failed > [ 1.039363] [TTM] Finalizing pool allocator > [ 1.039367] [TTM] Finalizing DMA pool allocator > [ 1.039369] ------------[ cut here ]------------ > [ 1.039373] WARNING: CPU: 2 PID: 1 at drivers/gpu/drm/ttm/ttm_page_alloc_dma.c:545 ttm_dma_free_pool+0x12d/0x130 > [ 1.039375] Modules linked in: > [ 1.039378] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 4.9.6-gentoo-r1 #1 > [ 1.039380] Hardware name: System manufacturer System Product Name, BIOS 3007 11/29/2016 > [ 1.039383] ffffc9000002fa10 ffffffff814b1818 0000000000000000 0000000000000000 > [ 1.039386] ffffc9000002fa50 ffffffff81061356 0000022182562d80 ffff88045b9b62c8 > [ 1.039389] ffff88045b895c00 0000000000000008 0000000000000018 ffff88045c3fe000 > [ 1.039392] Call Trace: > ...