[Bug 77436] KDE Konsole very slow scrolling with TearFree and QT graphics system native

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77436

--- Comment #53 from Ildar Nurislamov <absorbb at gmail.com> ---
Created attachment 100808
  --> https://bugs.freedesktop.org/attachment.cgi?id=100808&action=edit
intel-gpu-overlay output + intel_gpu_top

tried your kernel. But intel-gpu-overlay 1.6 says that GPU freq not found in
debugfs.
Anyway i caught some unusual output from dmesg:
[   89.523354] ------------[ cut here ]------------
[   89.523362] WARNING: CPU: 2 PID: 2623 at
drivers/gpu/drm/i915/intel_display.c:9494 intel_check_page_flip+0x117/0x130()
[   89.523363] Kicking stuck page flip: queued at 5336, now 5341
[   89.523364] Modules linked in: fuse af_packet nls_iso8859_1 nls_cp437 vfat
fat snd_hda_codec_realtek snd_hda_codec_generic x86_pkg_temp_thermal
snd_hda_intel intel_powerclamp snd_hda_controller coretemp snd_hda_codec
snd_hwdep snd_pcm kvm snd_seq snd_timer snd_seq_device keucr(C)
crct10dif_pclmul crc32_pclmul crc32c_intel snd ghash_clmulni_intel usb_storage
aesni_intel ablk_helper iTCO_wdt cryptd r8169 iTCO_vendor_support lrw gf128mul
mei_me glue_helper mii aes_x86_64 pcspkr soundcore mei sr_mod serio_raw cdrom
lpc_ich shpchp mfd_core i2c_i801 tpm_tis wmi tpm battery sg dm_mod efivarfs fan
thermal processor scsi_dh_rdac scsi_dh_emc scsi_dh_alua scsi_dh_hp_sw scsi_dh
[   89.523394] CPU: 2 PID: 2623 Comm: konsole Tainted: G         C   
3.15.0-rc7-2.g0de0f93-desktop+ #1
[   89.523395] Hardware name: Hewlett-Packard HP Pro 3500 Series/2ABF, BIOS
8.13 01/11/2013
[   89.523396]  0000000000000009 ffff88021fb03d80 ffffffff816e80cc
ffff88021fb03dc8
[   89.523398]  ffff88021fb03db8 ffffffff8105b02d ffff8802124f9000
ffff88021247c000
[   89.523399]  ffff88021247c198 0000000000000086 0000000000000009
ffff88021fb03e18
[   89.523401] Call Trace:
[   89.523402]  <IRQ>  [<ffffffff816e80cc>] dump_stack+0x4d/0x6f
[   89.523409]  [<ffffffff8105b02d>] warn_slowpath_common+0x7d/0xa0
[   89.523410]  [<ffffffff8105b09c>] warn_slowpath_fmt+0x4c/0x50
[   89.523414]  [<ffffffff81493309>] ? __intel_pageflip_stall_check+0xc9/0x140
[   89.523416]  [<ffffffff814a1e17>] intel_check_page_flip+0x117/0x130
[   89.523418]  [<ffffffff8147a06b>] ironlake_irq_handler+0x15b/0xdf0
[   89.523420]  [<ffffffff8153e76c>] ? __usb_hcd_giveback_urb+0x9c/0x100
[   89.523423]  [<ffffffff810b793e>] handle_irq_event_percpu+0x3e/0x1f0
[   89.523424]  [<ffffffff810b7b33>] handle_irq_event+0x43/0x60
[   89.523426]  [<ffffffff810ba811>] handle_edge_irq+0x91/0x160
[   89.523428]  [<ffffffff81004d61>] handle_irq+0x21/0x30
[   89.523431]  [<ffffffff816fb93f>] do_IRQ+0x4f/0xf0
[   89.523433]  [<ffffffff816f1b6d>] common_interrupt+0x6d/0x6d
[   89.523434]  <EOI>  [<ffffffff816f972d>] ? system_call_fastpath+0x1a/0x1f
[   89.523436] ---[ end trace ff48f125529813ef ]---

And made a picture of gpu_top and gpu-overlay. Xorg waits showed some extreme
numbers for a moments but was 300-500ms most of time.

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