Description of problem: This happened during bootup, after my system had previously had the GPU apparently crash and had to be restarted. Additional info: reporter: libreport-2.2.3 BUG: unable to handle kernel paging request at ffffc90405f80ffc IP: [<ffffffffa00ba7d8>] radeon_ring_backup+0xc8/0x160 [radeon] PGD 216015067 PUD 0 Oops: 0000 [#1] SMP Modules linked in: tcp_lp fuse ip6t_rpfilter ip6t_REJECT cfg80211 xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi iTCO_wdt iTCO_vendor_support uvcvideo videobuf2_vmalloc videobuf2_memops snd_usb_audio videobuf2_core videodev snd_usbmidi_lib snd_rawmidi media eeepc_wmi asus_wmi sparse_keymap rfkill mxm_wmi x86_pkg_temp_thermal coretemp kvm crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel microcode serio_raw joydev i2c_i801 snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device lpc_ich mfd_core snd_pcm e1000e snd_timer ptp snd pps_core soundcore mei_me mei shpchp tpm_tis video tpm_infineon tpm wmi nfsd auth_rpcgss nfs_acl lockd sunrpc binfmt_misc hid_logitech_dj radeon i2c_algo_bit drm_kms_helper ttm drm i2c_core CPU: 1 PID: 1112 Comm: Xorg Not tainted 3.15.10-200.fc20.x86_64 #1 Hardware name: ASUS All Series/GRYPHON Z87, BIOS 1504 10/03/2013 task: ffff880036d24520 ti: ffff8800cf1f0000 task.ti: ffff8800cf1f0000 RIP: 0010:[<ffffffffa00ba7d8>] [<ffffffffa00ba7d8>] radeon_ring_backup+0xc8/0x160 [radeon] RSP: 0018:ffff8800cf1f3b10 EFLAGS: 00010246 RAX: ffff8801afb00000 RBX: ffff880036fa5078 RCX: 0000000000000000 RDX: ffffc90005f81000 RSI: 0000000000000000 RDI: ffffc90405f80ffc RBP: ffff8800cf1f3b40 R08: 00000000000bda84 R09: 000000000011f000 R10: 0000000000000001 R11: ffffffff81056b79 R12: 00000000ffffffff R13: ffff880036fa5050 R14: 000000000002f6a1 R15: ffff8800cf1f3b90 FS: 00007ffa97a7d9c0(0000) GS:ffff88021ec80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc90405f80ffc CR3: 00000000cf1c5000 CR4: 00000000001407e0 Stack: ffff8800cf1f3b28 ffff880036fa4000 ffff880036fa5078 ffff8800cf1f3b90 0000000000000000 0000000000000000 ffff8800cf1f3c00 ffffffffa008a747 ffff880036fa5078 00000001810d6049 ffff880036fa4718 ffff880036fa4018 Call Trace: [<ffffffffa008a747>] radeon_gpu_reset+0xd7/0x2b0 [radeon] [<ffffffff8135b2f7>] ? call_rwsem_wake+0x17/0x30 [<ffffffffa00bb79c>] ? radeon_cs_parser_fini+0x11c/0x1f0 [radeon] [<ffffffffa00bc50a>] radeon_cs_ioctl+0x30a/0x710 [radeon] [<ffffffff8134e9bf>] ? idr_get_empty_slot+0x16f/0x3c0 [<ffffffffa0019a3c>] drm_ioctl+0x1ec/0x660 [drm] [<ffffffffa008804b>] radeon_drm_ioctl+0x4b/0x80 [radeon] [<ffffffff811f9ac0>] do_vfs_ioctl+0x2e0/0x4a0 [<ffffffff811f9d01>] SyS_ioctl+0x81/0xa0 [<ffffffff8111fc16>] ? __audit_syscall_exit+0x1f6/0x2a0 [<ffffffff816ffae9>] system_call_fastpath+0x16/0x1b Code: 48 85 c0 49 89 07 74 7b 41 8d 56 ff 31 c9 4c 8d 04 95 04 00 00 00 eb 06 0f 1f 00 49 8b 07 48 8b 53 08 41 8d 74 24 01 4a 8d 3c a2 <8b> 3f 89 3c 08 23 73 54 48 83 c1 04 4c 39 c1 41 89 f4 75 dc 4c RIP [<ffffffffa00ba7d8>] radeon_ring_backup+0xc8/0x160 [radeon]
Created attachment 929718 [details] File: dmesg
The GPU is a Cayman board (Radeon HD 6950.) It seems to work fine under older kernels. The problem occurs with both the latest F19 (3.14.15-100) and F20 (3.15.10-200) kernels. The problem results in the GPU locking up and the screen staying in power saving mode, even though everything else about the system sans GPU seems to be fine. Considering trying to boot with radeon.dpm=0
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