Bug 93728

Summary:	[byt-m edp] Fuzzy display with i915 via eDP
Product:	DRI	Reporter:	Jani Nikula <jani.nikula>
Component:	DRM/Intel	Assignee:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Status:	CLOSED INVALID	QA Contact:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity:	normal
Priority:	medium	CC:	intel-gfx-bugs
Version:	XOrg git
Hardware:	Other
OS:	All
URL:	https://bugzilla.kernel.org/show_bug.cgi?id=89251
Whiteboard:
i915 platform:	BYT	i915 features:	display/eDP

Description Jani Nikula 2016-01-15 13:09:52 UTC

Moving from https://bugzilla.kernel.org/show_bug.cgi?id=89251

I have a small panel PC with Intel BayTrail-M chipset. Once the i915 driver is loaded, the display (internally connected via eDP) shows every second pixel line shifted one pixel to the right, which leads to "fuzzy" graphics. Booting with "nomodeset" avoids the problem (see attachment). I tested with 3.16, 3.17 and 3.18 (problem persists).

PC: http://www.winmate.com.tw/TabletPC/TabletPCSpec.asp?Prod=13_0184
lspci output: 00:02.0 VGA compatible controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display (rev 0c)

...

Problem persists with 4.2.5, unfortunately.

Comment 1 Jani Nikula 2016-01-15 13:13:33 UTC

Photo with/without nomodeset: https://bugzilla.kernel.org/attachment.cgi?id=159711

Dmesg running 4.2.5: https://bugzilla.kernel.org/attachment.cgi?id=191561

Comment 2 Jani Nikula 2016-10-31 15:04:53 UTC

Seems fair to say we didn't figure this out. Timeout, closing. Please reopen if the problem persists with current kernels.

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