Quite often GPU hangs here on my hw (dell xps 9650, Integrated Graphics Chipset: Intel(R) HD Graphics 4600)

mesa 10.6.4
kernel 4.2.0-rc7-00024-g1b647a1

[    17.941] (II) intel(0): Using Kernel Mode Setting driver: i915, version 1.6.0 20150522
[    17.941] (II) intel(0): SNA compiled from 2.99.917-441-g18e4845

from dmesg:
19102.058686] [drm] stuck on render ring
[19102.059595] [drm] GPU HANG: ecode 7:0:0x85df3c1d, in chrome [6865], reason: Ring hung, action: reset
[19102.059597] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
[19102.059598] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
[19102.059600] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
[19102.059601] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
[19102.059603] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[19102.061732] drm/i915: Resetting chip after gpu hang
[20855.777349] [drm] stuck on render ring
[20855.778270] [drm] GPU HANG: ecode 7:0:0x85dffff8, in chrome [24723], reason: Ring hung, action: reset
[20855.780416] drm/i915: Resetting chip after gpu hang
[27244.192173] [drm] stuck on render ring
[27244.192986] [drm] GPU HANG: ecode 7:0:0x85df3c11, in chrome [8196], reason: Ring hung, action: reset
[27244.194584] drm/i915: Resetting chip after gpu hang
[28395.352094] [drm] stuck on render ring
[28395.353310] [drm] GPU HANG: ecode 7:0:0x85dffffc, in chrome [23301], reason: Ring hung, action: reset
[28395.353410] ------------[ cut here ]------------
[28395.353430] WARNING: CPU: 2 PID: 25480 at drivers/gpu/drm/i915/intel_display.c:11002 intel_mmio_flip_work_func+0x5e/0x312()
[28395.353434] WARN_ON(__i915_wait_request(mmio_flip->req, mmio_flip->crtc->reset_counter, false, NULL, &mmio_flip->i915->rps.mmioflips))
[28395.353437] Modules linked in:
[28395.353440]  xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 iptable_filter xt_conntrack nf_conntrack sch_sfq drbg ansi_cprng ctr ccm hid_logitech_hidpp uvcvideo btusb btrtl videobuf2_vmalloc videobuf2_memops btbcm btintel videobuf2_core hid_multitouch hid_logitech_dj v4l2_common bluetooth usbhid videodev hid media joydev ext4 crc16 mbcache jbd2 arc4 iwlmvm intel_rapl x86_pkg_temp_thermal rtsx_pci_sdmmc intel_powerclamp mac80211 coretemp ehci_pci mmc_core crct10dif_pclmul dell_wmi sparse_keymap xhci_pci iTCO_wdt crc32_pclmul iTCO_vendor_support nouveau ghash_clmulni_intel iwlwifi psmouse xhci_hcd ehci_hcd mxm_wmi dell_laptop input_leds cfg80211 dcdbas pcspkr ttm usbcore serio_raw microcode rtsx_pci acpi_als lpc_ich i2c_i801 processor_thermal_device kfifo_buf shpchp usb_common mfd_core intel_soc_dts_iosf
[28395.353531]  fan int3403_thermal industrialio dell_rbtn battery int3402_thermal ac int3400_thermal iosf_mbi rfkill dell_smo8800 int340x_thermal_zone wmi acpi_thermal_rel thermal evdev tcp_illinois snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_intel snd_hda_codec snd_hwdep snd_hda_core snd_pcm snd_timer snd soundcore cpufreq_stats binfmt_misc processor vhost_net tun vhost macvtap macvlan kvm_intel kvm efivarfs ip_tables x_tables ipv6 autofs4 xfs(E) libcrc32c(E) crc32c_generic(E) crc32c_intel(E) aesni_intel(E) lrw(E) gf128mul(E) glue_helper(E) ablk_helper(E) cryptd(E) aes_x86_64(E) dm_crypt(E) dm_mod(E) sd_mod(E) ahci(E) libahci(E) libata(E) scsi_mod(E)
[28395.353607] CPU: 2 PID: 25480 Comm: kworker/2:1 Tainted: G            E   4.2.0-rc7-00024-g1b647a1 #146
[28395.353610] Hardware name: Dell Inc. XPS 15 9530/XPS 15 9530, BIOS A08 01/08/2015
[28395.353619] Workqueue: events intel_mmio_flip_work_func
[28395.353623]  0000000000000009 ffff880019ebbce8 ffffffff814f6c8a 0000000000000006
[28395.353629]  ffff880019ebbd38 ffff880019ebbd28 ffffffff810496e8 ffff880019ebbd18
[28395.353635]  ffffffff8137ed60 ffff880077bb0600 ffff88042ea93340 0000000000000000
[28395.353640] Call Trace:
[28395.353652]  [<ffffffff814f6c8a>] dump_stack+0x4c/0x6e
[28395.353661]  [<ffffffff810496e8>] warn_slowpath_common+0xa1/0xbb
[28395.353667]  [<ffffffff8137ed60>] ? intel_mmio_flip_work_func+0x5e/0x312
[28395.353673]  [<ffffffff81049748>] warn_slowpath_fmt+0x46/0x48
[28395.353679]  [<ffffffff8137ed60>] intel_mmio_flip_work_func+0x5e/0x312
[28395.353687]  [<ffffffff8105c839>] process_one_work+0x1bb/0x362
[28395.353693]  [<ffffffff8105d63b>] worker_thread+0x273/0x35b
[28395.353699]  [<ffffffff8105d3c8>] ? rescuer_thread+0x283/0x283
[28395.353704]  [<ffffffff8106164b>] kthread+0xd2/0xda
[28395.353710]  [<ffffffff81061579>] ? kthread_create_on_node+0x181/0x181
[28395.353717]  [<ffffffff814fcc9f>] ret_from_fork+0x3f/0x70
[28395.353721]  [<ffffffff81061579>] ? kthread_create_on_node+0x181/0x181
[28395.353726] ---[ end trace 7b7ff545b34de293 ]---
[28395.355547] drm/i915: Resetting chip after gpu hang


cat /sys/class/drm/card0/error
http://ixion.pld-linux.org/~arekm/bugs-freedesktop-intel1.txt.gz


I see new commits in ddx git, so updating...