Re: [Intel HD 4400] strongly irritating artefacts on 2560x1440 laptop display

[Jani Nikula <jani.nikula@linux.intel.com>]

On Tue, 27 Jan 2015, Martin Wilck <mwilck@arcor.de> wrote:
> Dear list members,
>
> I suffer from highly disturbing artefacts with the Intel HD 4400 chip
> set on thw 2560x1440 display (Sharp LQ133T1JW19) of my Fujitsu Lifebook
> S904. The effects are hard to describe, therefore I have uploaded a
> video to
> https://www.dropbox.com/sh/9wh0nzvp0w1phxz/AAAsvAqHN8ApXzor58FmGbwLa?dl=0.
>  I can distinguish 2 effects that are possibly related to each other:

Just a quick guess, what does this say:

# cat /sys/module/i915/parameters/enable_{fbc,ips,psr}

Please try these module parameters for the non-zero ones:

i915.enable_fbc=0
i915.enable_ips=0
i915.enable_psr=0

BR,
Jani.

>
>  1. Maximized windows under GNOME3 (fully maximized or half-maximized on
> the right edge of the screen) fill the screen vertically with a single
> color (usually grey). Half-maximzed windows on the left edge are not
> affected. The effect is only seen if the Laptop screen is the main
> monitor in GNOME (showing the panel on top). Some applications, which
> start in maximized mode and can't be resized, are unusable on this screen.
>
>  2. Artefacts appear when windows are placed on the right and bottom
> areas of the screen. The artefacts look as if pixels extend vertically
> from their horizontal position to the bottom edge of the screen
> (resulting in vertical lines). The strength of the effect depends on the
> content of the windows that are visible. The effect "extends" from the
> window causing it to other windows and the background. The effect is not
> seen in screenshots (screenshot looks fine although the screen was
> unreadable at the time I took it).
>
> 1.) is observed only under GNOME, but I see 2.) on KDE and LXDE, too. I
> also tried various distributions. Most of my experiments have been done
> on OpenSUSE 13.2, kernel-vanilla-3.19.rc5, xorg 7.6_1.16.1-5.1, intel
> 2.99.916, libdrm_intel1-2.4.58-1.1, Mesa 10.3.0-91.3.2. But I see the
> artefacts also on Fedora 21 and Ubuntu 14.04.
>
> As a matter of fact, I tried the modesetting driver and even fbdev and
> observed similar effects, too. Thus i915 may actually not be the culprit
> here, but could I figure no other place to ask for help than this
> mailing list.
>
> I have also experimented with resolutions and refresh rates. Only at
> 1024x768 and lower I was unable to reproduce the problem.
>
> Any help would be highly appreciated. I am highly willing to do any
> testing and/or debugging that may be necessary to find the problem.
>
> Best regards
> Martin
>
>
> martin@artemis:~> xrandr --verbose
> Screen 0: minimum 8 x 8, current 2560 x 1440, maximum 32767 x 32767
> eDP1 connected primary 2560x1440+0+0 (0x49) normal (normal left inverted
> right x axis y axis) 294mm x 165mm
> 	Identifier: 0x43
> 	Timestamp:  19447
> 	Subpixel:   unknown
> 	Gamma:      1.0:1.0:1.0
> 	Brightness: 1.0
> 	Clones:
> 	CRTC:       0
> 	CRTCs:      0 1 2
> 	Transform:  1.000000 0.000000 0.000000
> 	            0.000000 1.000000 0.000000
> 	            0.000000 0.000000 1.000000
> 	           filter:
> 	_MUTTER_PRESENTATION_OUTPUT: 0
> 	EDID:
> 		00ffffffffffff004d10121400000000
> 		24170104a51d1178068800a4564d9a26
> 		0d505400000001010101010101010101
> 		010101010101735f00a0a0a03a503020
> 		e50026a510000018454c00a0a0a03a50
> 		3020e50026a510000018aa3f00a0a0a0
> 		3a503020e50026a510000018000000fc
> 		004c5131333354314a5731390a2000b6
> 	BACKLIGHT: 892
> 		range: (0, 892)
> 	Backlight: 892
> 		range: (0, 892)
> 	scaling mode: Full aspect
> 		supported: None, Full, Center, Full aspect
> 	Broadcast RGB: Automatic
> 		supported: Automatic, Full, Limited 16:235
> 	audio: auto
> 		supported: force-dvi, off, auto, on
>   2560x1440 (0x49) 244.350MHz -HSync -VSync *current +preferred
>         h: width  2560 start 2608 end 2640 total 2720 skew    0 clock
> 89.83KHz
>         v: height 1440 start 1454 end 1459 total 1498           clock
> 59.97Hz
>   2560x1440 (0xae) 195.250MHz -HSync -VSync
>         h: width  2560 start 2608 end 2640 total 2720 skew    0 clock
> 71.78KHz
>         v: height 1440 start 1454 end 1459 total 1498           clock
> 47.92Hz
>   2560x1440 (0xaf) 162.980MHz -HSync -VSync
>         h: width  2560 start 2608 end 2640 total 2720 skew    0 clock
> 59.92KHz
>         v: height 1440 start 1454 end 1459 total 1498           clock
> 40.00Hz
>   1920x1440 (0xb0) 234.000MHz -HSync +VSync
>         h: width  1920 start 2048 end 2256 total 2600 skew    0 clock
> 90.00KHz
>         v: height 1440 start 1441 end 1444 total 1500           clock
> 60.00Hz
>   1856x1392 (0xb1) 218.300MHz -HSync +VSync
>         h: width  1856 start 1952 end 2176 total 2528 skew    0 clock
> 86.35KHz
>         v: height 1392 start 1393 end 1396 total 1439           clock
> 60.01Hz
>   1792x1344 (0xb2) 204.800MHz -HSync +VSync
>         h: width  1792 start 1920 end 2120 total 2448 skew    0 clock
> 83.66KHz
>         v: height 1344 start 1345 end 1348 total 1394           clock
> 60.01Hz
>   1600x1200 (0xb3) 162.000MHz +HSync +VSync
>         h: width  1600 start 1664 end 1856 total 2160 skew    0 clock
> 75.00KHz
>         v: height 1200 start 1201 end 1204 total 1250           clock
> 60.00Hz
>   1400x1050 (0xb4) 122.000MHz +HSync +VSync
>         h: width  1400 start 1488 end 1640 total 1880 skew    0 clock
> 64.89KHz
>         v: height 1050 start 1052 end 1064 total 1082           clock
> 59.98Hz
>   1280x1024 (0xb5) 108.000MHz +HSync +VSync
>         h: width  1280 start 1328 end 1440 total 1688 skew    0 clock
> 63.98KHz
>         v: height 1024 start 1025 end 1028 total 1066           clock
> 60.02Hz
>   1280x960 (0xb6) 108.000MHz +HSync +VSync
>         h: width  1280 start 1376 end 1488 total 1800 skew    0 clock
> 60.00KHz
>         v: height  960 start  961 end  964 total 1000           clock
> 60.00Hz
>   1024x768 (0xb7) 65.000MHz -HSync -VSync
>         h: width  1024 start 1048 end 1184 total 1344 skew    0 clock
> 48.36KHz
>         v: height  768 start  771 end  777 total  806           clock
> 60.00Hz
>   800x600 (0xb8) 40.000MHz +HSync +VSync
>         h: width   800 start  840 end  968 total 1056 skew    0 clock
> 37.88KHz
>         v: height  600 start  601 end  605 total  628           clock
> 60.32Hz
>   800x600 (0xb9) 36.000MHz +HSync +VSync
>         h: width   800 start  824 end  896 total 1024 skew    0 clock
> 35.16KHz
>         v: height  600 start  601 end  603 total  625           clock
> 56.25Hz
>   640x480 (0xba) 25.175MHz -HSync -VSync
>         h: width   640 start  656 end  752 total  800 skew    0 clock
> 31.47KHz
>         v: height  480 start  490 end  492 total  525           clock
> 59.94Hz
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-- 
Jani Nikula, Intel Open Source Technology Center
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