This doesn't looks really good, right ? Should I report that somewhere ? I actually had this bug when using RHEL7 profile for a Fedora 24 (to provide enough vram, because the default with other profiles is really lower). [Wed Jul 13 11:00:12 2016] ------------[ cut here ]------------ [Wed Jul 13 11:00:12 2016] WARNING: CPU: 2 PID: 1750 at drivers/gpu/drm/drm_irq.c:689 drm_calc_timestamping_constants+0x15b/0x160 [drm]() [Wed Jul 13 11:00:12 2016] Modules linked in: uinput fuse nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_broute bridge stp llc ebtable_nat ip6table_security ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_raw ip6table_mangle iptable_security iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_raw iptable_mangle ebtable_filter ebtables ip6table_filter ip6_tables crct10dif_pclmul crc32_pclmul ghash_clmulni_intel ppdev joydev i2c_piix4 virtio_balloon parport_pc parport acpi_cpufreq tpm_tis tpm nfsd auth_rpcgss nfs_acl lockd grace sunrpc virtio_console virtio_scsi virtio_blk virtio_net qxl drm_kms_helper ttm crc32c_intel drm serio_raw virtio_pci virtio_ring virtio ata_generic pata_acpi [Wed Jul 13 11:00:12 2016] CPU: 2 PID: 1750 Comm: Xorg Tainted: G W 4.5.5-300.fc24.x86_64 #1 [Wed Jul 13 11:00:12 2016] Hardware name: Red Hat RHEV Hypervisor, BIOS seabios-1.7.5-11.el7 04/01/2014 [Wed Jul 13 11:00:12 2016] 0000000000000286 000000009e0fbed4 ffff880074e93978 ffffffff813d35af [Wed Jul 13 11:00:12 2016] 0000000000000000 ffffffffa009b9dc ffff880074e939b0 ffffffff810a5f12 [Wed Jul 13 11:00:12 2016] ffff8800360b7800 ffff880036b92800 ffff880036b92b78 0000000000000001 [Wed Jul 13 11:00:12 2016] Call Trace: [Wed Jul 13 11:00:12 2016] [<ffffffff813d35af>] dump_stack+0x63/0x84 [Wed Jul 13 11:00:12 2016] [<ffffffff810a5f12>] warn_slowpath_common+0x82/0xc0 [Wed Jul 13 11:00:12 2016] [<ffffffff810a605a>] warn_slowpath_null+0x1a/0x20 [Wed Jul 13 11:00:12 2016] [<ffffffffa006e36b>] drm_calc_timestamping_constants+0x15b/0x160 [drm] [Wed Jul 13 11:00:12 2016] [<ffffffffa00d69ff>] drm_crtc_helper_set_mode+0x42f/0x510 [drm_kms_helper] [Wed Jul 13 11:00:12 2016] [<ffffffffa00d79c3>] drm_crtc_helper_set_config+0xa43/0xb90 [drm_kms_helper] [Wed Jul 13 11:00:12 2016] [<ffffffffa0077b42>] drm_mode_set_config_internal+0x62/0x100 [drm] [Wed Jul 13 11:00:12 2016] [<ffffffffa007c25f>] drm_mode_setcrtc+0x2ef/0x520 [drm] [Wed Jul 13 11:00:12 2016] [<ffffffffa006d712>] drm_ioctl+0x152/0x540 [drm] [Wed Jul 13 11:00:12 2016] [<ffffffffa007bf70>] ? drm_mode_setplane+0x1b0/0x1b0 [drm] [Wed Jul 13 11:00:12 2016] [<ffffffff81256183>] do_vfs_ioctl+0xa3/0x5d0 [Wed Jul 13 11:00:12 2016] [<ffffffff81256729>] SyS_ioctl+0x79/0x90 [Wed Jul 13 11:00:12 2016] [<ffffffff817cecee>] entry_SYSCALL_64_fastpath+0x12/0x6d [Wed Jul 13 11:00:12 2016] ---[ end trace d65ce2e725b31419 ]--- [Wed Jul 13 11:00:12 2016] input: spice vdagent tablet as /devices/virtual/input/input12 [Wed Jul 13 11:00:18 2016] input: spice vdagent tablet as /devices/virtual/input/input13 [Wed Jul 13 11:00:20 2016] input: spice vdagent tablet as /devices/virtual/input/input14 [Wed Jul 13 11:00:38 2016] input: spice vdagent tablet as /devices/virtual/input/input15