If i connect a third monitor on HDMI , on that one i get a purple vertical line on the left , DVI-D one does not work, and framerate of gnome-shell is very very low On the kernel logs at boot i get [ 25.163082] WARNING: CPU: 1 PID: 1188 at drivers/gpu/drm/ttm/ttm_bo_vm.c:269 ttm_bo_vm_open+0x52/0x80 [ttm]() [ 25.163084] Modules linked in: ccm xt_CHECKSUM iptable_mangle ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack tun bnep bridge stp llc snd_hda_codec_hdmi x86_pkg_temp_thermal coretemp snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel kvm_intel snd_hda_codec snd_hwdep arc4 ath9k ath9k_common ath9k_hw snd_seq ath ir_lirc_codec ir_mce_kbd_decoder lirc_dev ir_sony_decoder ir_nec_decoder ir_sanyo_decoder ir_rc6_decoder ir_jvc_decoder mac80211 ir_rc5_decoder nouveau r820t kvm snd_seq_device snd_pcm iTCO_wdt rtl2832 cfg80211 crct10dif_pclmul iTCO_vendor_support dvb_usb_rtl28xxu rtl2830 i2c_algo_bit ttm crc32_pclmul btusb crc32c_intel dvb_usb_v2 eeepc_wmi asus_wmi snd_timer drm_kms_helper sparse_keymap snd drm ghash_clmulni_intel dvb_core soundcore [ 25.163138] bluetooth i2c_i801 radio_ma901 tpm_tis tpm_infineon joydev videodev mei_me 6lowpan_iphc rfkill rc_core media i2c_core serio_raw tpm lpc_ich mei shpchp mfd_core microcode nfsd auth_rpcgss nfs_acl lockd sunrpc raid0 mxm_wmi e1000e ptp pps_core video wmi [ 25.163164] CPU: 1 PID: 1188 Comm: Xorg Tainted: G W 3.14.5-200.fc20.x86_64 #1 [ 25.163166] Hardware name: ASUS All Series/Z87-PRO, BIOS 0903 05/06/2013 [ 25.163168] 0000000000000000 00000000c1415f90 ffff88030476bd90 ffffffff816efa42 [ 25.163173] 0000000000000000 ffff88030476bdc8 ffffffff8108a1cd ffff880309ca6000 [ 25.163179] ffff880309d23ac8 ffff88030bd69f18 0000000000000000 0000000000000000 [ 25.163183] Call Trace: [ 25.163189] [<ffffffff816efa42>] dump_stack+0x45/0x56 [ 25.163194] [<ffffffff8108a1cd>] warn_slowpath_common+0x7d/0xa0 [ 25.163199] [<ffffffff8108a2fa>] warn_slowpath_null+0x1a/0x20 [ 25.163209] [<ffffffffa034b132>] ttm_bo_vm_open+0x52/0x80 [ttm] [ 25.163214] [<ffffffff81088f17>] copy_process.part.26+0x18f7/0x1b90 [ 25.163219] [<ffffffff81089373>] do_fork+0xc3/0x370 [ 25.163225] [<ffffffff810896a6>] SyS_clone+0x16/0x20 [ 25.163229] [<ffffffff81700189>] stub_clone+0x69/0x90 [ 25.163234] [<ffffffff816ffe29>] ? system_call_fastpath+0x16/0x1b [ 25.163237] ---[ end trace da86bd3f343ad454 ]--- [ 25.163241] ------------[ cut here ]------------ and when using it thousands of lines with [ 342.347721] nouveau E[ PDISP][0000:01:00.0] chid 0 mthd 0x0080 data 0x00000000 0x10005080 0x0000400d [ 342.360259] nouveau E[ PDISP][0000:01:00.0] chid 0 mthd 0x0080 data 0x00000000 0x10005080 0x0000400d [ 342.373450] nouveau E[ PDISP][0000:01:00.0] chid 0 mthd 0x0080 data 0x00000000 0x10005080 0x0000400d [ 342.386710] nouveau E[ PDISP][0000:01:00.0] chid 0 mthd 0x0080 data 0x00000000 0x10005080 0x0000400d [ 342.400035] nouveau E[ PDISP][0000:01:00.0] chid 0 mthd 0x0080 data 0x00000000 0x10005080 0x0000400d [ 342.412854] nouveau E[ PDISP][0000:01:00.0] chid 0 mthd 0x0080 data 0x00000000 0x10005080 0x0000400d [ 342.426119] nouveau E[ PDISP][0000:01:00.0] chid 0 mthd 0x0080 data 0x00000000 0x10005080 0x0000400d [ 343.290435] nouveau E[ PDISP][0000:01:00.0] chid 0 mthd 0x0080 data 0x00000000 0x10005080 0x0000400d
Forgot to mention , i'm running Fedora 20 x86_64 , Kernel version 3.14.5-200
Purple screen + extremely slow? You simply hit the memory bandwidth limit :s It will be fixed by reclocking memory, efforts towards this goal are underway but won't be finished any time soon :s You may want to stick with the proprietary driver :s
If it's just memory that's too slow, you could try http://cgit.freedesktop.org/~airlied/linux/log/?h=drm-next which should allow you to try to change pstates via /sys/class/drm/card0/device/pstate. Note that this is very experimental, and is more than likely just going to hang your card. But worth a shot.
It seems like there are a bunch of different and unrelated issues here. HDMI + purple line has been fixed (in 3.18-rcX by commit a522946174b5ae389af0856c422d865a63c70316). That warning is weird... feels like perhaps you're running on a kernel with CMA enabled? If so, disable it. Please test this out on 3.18-rc5 or later.
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