Created attachment 112956
/sys/class/drm/card0/error when running firefox http://www.google.com/chrome/

Relevant dmesg print:
[  151.816215] [drm] stuck on render ring
[  151.817277] [drm] GPU HANG: ecode 4:0:0xf41b8c79, in firefox [2491], reason: Ring hung, action: reset
[  151.817279] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
[  151.817281] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
[  151.817282] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
[  151.817284] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
[  151.817286] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[  152.168294] drm/i915: Resetting chip after gpu hang
[  152.201301] ------------[ cut here ]------------
[  152.201383] WARNING: CPU: 0 PID: 86 at /home/kernel/COD/linux/drivers/gpu/drm/i915/intel_sdvo.c:1424 intel_sdvo_get_config+0x201/0x220 [i9
15]()
[  152.201388] SDVO pixel multiplier mismatch, port: 0, encoder: 1
[  152.201391] Modules linked in: bnep rfcomm dm_crypt snd_hda_codec_idt snd_hda_codec_hdmi snd_hda_codec_generic wl(POE) snd_hda_intel gpio_
ich snd_hda_controller uvcvideo snd_hda_codec videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common dell_wmi snd_hwdep snd_pcm videod
ev sparse_keymap dell_laptop dcdbas i8k snd_seq_midi snd_seq_midi_event snd_rawmidi joydev media serio_raw coretemp r852 snd_seq sm_common na
nd snd_seq_device nand_ecc btusb nand_bch bch snd_timer nand_ids cfg80211 bluetooth snd mtd soundcore r592 memstick lpc_ich mac_hid binfmt_mi
sc parport_pc ppdev lp parport btrfs xor raid6_pq hid_generic usbhid hid psmouse sdhci_pci sdhci firewire_ohci firewire_core ahci crc_itu_t l
ibahci i915 sky2 i2c_algo_bit drm_kms_helper video wmi drm
[  152.201502] CPU: 0 PID: 86 Comm: kworker/0:2 Tainted: P     U  W  OE  3.19.0-031900rc6-generic #201501261152
[  152.201507] Hardware name: Dell Inc. Inspiron 1525                   /0U990C, BIOS A13 06/27/2008
[  152.201552] Workqueue: events i915_error_work_func [i915]
[  152.201557]  0000000000000590 ffff8800b5fabb98 ffffffff817c4584 0000000000000007
[  152.201565]  ffff8800b5fabbe8 ffff8800b5fabbd8 ffffffff81076df7 ffff8800b5fabc08
[  152.201571]  ffff880036368710 ffff88003596a000 0000000000000000 0000000000000001
[  152.201578] Call Trace:
[  152.201591]  [<ffffffff817c4584>] dump_stack+0x45/0x57
[  152.201600]  [<ffffffff81076df7>] warn_slowpath_common+0x97/0xe0
[  152.201607]  [<ffffffff81076ef6>] warn_slowpath_fmt+0x46/0x50
[  152.201665]  [<ffffffffc02195cf>] ? intel_sdvo_get_value+0x3f/0x60 [i915]
[  152.201723]  [<ffffffffc021ab21>] intel_sdvo_get_config+0x201/0x220 [i915]
[  152.201776]  [<ffffffffc01d4d9e>] intel_modeset_readout_hw_state+0x2ae/0x450 [i915]
[  152.201830]  [<ffffffffc01eeabe>] intel_modeset_setup_hw_state+0x2e/0x3c0 [i915]
[  152.201883]  [<ffffffffc01ef320>] intel_finish_reset+0x160/0x1b0 [i915]
[  152.201931]  [<ffffffffc01b482f>] i915_error_work_func+0xdf/0x150 [i915]
[  152.201945]  [<ffffffff8108f6dd>] process_one_work+0x14d/0x460
[  152.201952]  [<ffffffff810900bb>] worker_thread+0x11b/0x3f0
[  152.201960]  [<ffffffff8108ffa0>] ? create_worker+0x1e0/0x1e0
[  152.201967]  [<ffffffff81095cc9>] kthread+0xc9/0xe0
[  152.201974]  [<ffffffff81095c00>] ? flush_kthread_worker+0x90/0x90
[  152.201982]  [<ffffffff817d17fc>] ret_from_fork+0x7c/0xb0
[  152.201989]  [<ffffffff81095c00>] ? flush_kthread_worker+0x90/0x90
[  152.201994] ---[ end trace 4841b4400897d54d ]---