Hi, 
i updated linux kernel :
Linux piotrek-laptop 3.19.0-30-generic #33-Ubuntu SMP Mon Sep 21 20:58:04 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

but issue still occures - here is sample log:

[ 4834.946203] ------------[ cut here ]------------
[ 4834.946214] WARNING: CPU: 0 PID: 878 at /build/linux-aY9Y6L/linux-3.19.0/ubuntu/i915/intel_display.c:12326 check_crtc_state+0x317/0x4c0 [i915_bpo]()
[ 4834.946215] pipe state doesn't match!
[ 4834.946229] Modules linked in: btrfs xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c ctr ccm vmnet(OE) parport_pc vmw_vsock_vmci_transport vsock vmw_vmci vmmon(OE) bbswitch(OE) binfmt_misc rfcomm bnep nls_iso8859_1 arc4 snd_hda_codec_hdmi intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel asus_nb_wmi kvm asus_wmi sparse_keymap mxm_wmi crct10dif_pclmul crc32_pclmul iwlmvm ghash_clmulni_intel nvidia(POE) mac80211 aesni_intel uvcvideo aes_x86_64 lrw snd_soc_rt5640 gf128mul videobuf2_vmalloc glue_helper snd_soc_rl6231 videobuf2_memops ablk_helper snd_soc_core cryptd serio_raw snd_compress snd_pcm_dmaengine videobuf2_core iwlwifi snd_seq_midi cdc_ether v4l2_common snd_seq_midi_event videodev usbnet btusb r8152 media i915_bpo joydev snd_hda_codec_conexant
[ 4834.946245]  snd_hda_codec_generic mii snd_rawmidi bluetooth cfg80211 snd_hda_intel snd_hda_controller lpc_ich snd_hda_codec intel_ips snd_hwdep mei_me drm_kms_helper snd_seq mei snd_pcm snd_seq_device shpchp snd_timer snd drm i2c_hid i2c_designware_platform wmi i2c_algo_bit i2c_designware_core soundcore dw_dmac int3402_thermal snd_soc_sst_acpi dw_dmac_core 8250_dw spi_pxa2xx_platform int3400_thermal mac_hid processor_thermal_device acpi_thermal_rel acpi_pad ppdev lp parport autofs4 hid_generic usbhid hid ahci psmouse(OE) libahci sdhci_acpi video sdhci [last unloaded: parport_pc]
[ 4834.946247] CPU: 0 PID: 878 Comm: Xorg Tainted: P        W  OE  3.19.0-30-generic #33-Ubuntu
[ 4834.946247] Hardware name: ASUSTeK COMPUTER INC. UX303LNB/UX303LNB, BIOS UX303LNB.206 01/22/2015
[ 4834.946249]  ffffffffc0946138 ffff88031f5b3538 ffffffff817c4d4f 00000000a51aa51a
[ 4834.946250]  ffff88031f5b3588 ffff88031f5b3578 ffffffff81076a8a ffff88031f5b3550
[ 4834.946251]  ffff88031f38a800 ffff88031f5b3618 ffff88031f38ab58 ffff88031f38ab60
[ 4834.946251] Call Trace:
[ 4834.946256]  [<ffffffff817c4d4f>] dump_stack+0x45/0x57
[ 4834.946258]  [<ffffffff81076a8a>] warn_slowpath_common+0x8a/0xc0
[ 4834.946259]  [<ffffffff81076b06>] warn_slowpath_fmt+0x46/0x50
[ 4834.946271]  [<ffffffffc08d6647>] check_crtc_state+0x317/0x4c0 [i915_bpo]
[ 4834.946284]  [<ffffffffc08eb539>] intel_modeset_check_state+0x239/0x720 [i915_bpo]
[ 4834.946295]  [<ffffffffc08ec812>] intel_crtc_set_config+0x572/0x5d0 [i915_bpo]
[ 4834.946308]  [<ffffffffc04f6b26>] drm_mode_set_config_internal+0x66/0x100 [drm]
[ 4834.946314]  [<ffffffffc0613b48>] restore_fbdev_mode+0xc8/0xf0 [drm_kms_helper]
[ 4834.946319]  [<ffffffffc0615bb9>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x80 [drm_kms_helper]
[ 4834.946324]  [<ffffffffc0615c32>] drm_fb_helper_set_par+0x22/0x50 [drm_kms_helper]
[ 4834.946336]  [<ffffffffc08f9cda>] intel_fbdev_set_par+0x1a/0x60 [i915_bpo]
[ 4834.946338]  [<ffffffff81434d5a>] fb_set_var+0x18a/0x410
[ 4834.946341]  [<ffffffff8109fdb9>] ? check_preempt_curr+0x89/0xa0
[ 4834.946343]  [<ffffffff810a7418>] ? __enqueue_entity+0x78/0x80
[ 4834.946344]  [<ffffffff810aede0>] ? enqueue_entity+0x400/0xc30
[ 4834.946347]  [<ffffffff810200df>] ? __switch_to_xtra+0x13f/0x170
[ 4834.946348]  [<ffffffff8142b789>] fbcon_blank+0x229/0x300
[ 4834.946350]  [<ffffffff810138df>] ? __switch_to+0x44f/0x5e0
[ 4834.946353]  [<ffffffff814bb78a>] do_unblank_screen+0xba/0x1f0
[ 4834.946355]  [<ffffffff814b127d>] complete_change_console+0x5d/0xf0
[ 4834.946357]  [<ffffffff814b249a>] vt_ioctl+0x118a/0x1460
[ 4834.946363]  [<ffffffffc04eb91c>] ? drm_ioctl+0x8c/0x680 [drm]
[ 4834.946365]  [<ffffffff814a43b1>] tty_ioctl+0x411/0xcb0
[ 4834.946368]  [<ffffffff812096a0>] do_vfs_ioctl+0x2e0/0x4e0
[ 4834.946370]  [<ffffffff811f6c5e>] ? ____fput+0xe/0x10
[ 4834.946371]  [<ffffffff81093f0c>] ? task_work_run+0xbc/0xf0
[ 4834.946373]  [<ffffffff81209921>] SyS_ioctl+0x81/0xa0
[ 4834.946374]  [<ffffffff817cbe8d>] system_call_fastpath+0x16/0x1b
[ 4834.946375] ---[ end trace d463abfe3ff14d27 ]---
[ 4834.946413] [drm:intel_pipe_config_compare [i915_bpo]] *ERROR* mismatch in base.adjusted_mode.crtc_clock (expected 138780, found 92519)
[ 4834.946413] ------------[ cut here ]------------