Bug 103243

Summary:	1.19.4 [REGRESSION] commit 388dc1aeac9acf2d51ad5103570beffd81d78b96 breaks PRIME synchronization
Product:	xorg	Reporter:	Maik Freudenberg <hhfeuer>
Component:	Driver/modesetting	Assignee:	Xorg Project Team <xorg-team>
Status:	RESOLVED FIXED	QA Contact:	Xorg Project Team <xorg-team>
Severity:	normal
Priority:	medium	CC:	keithp
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Maik Freudenberg 2017-10-12 15:32:35 UTC

Commit
https://cgit.freedesktop.org/xorg/xserver/commit/?h=server-1.19-branch&id=388dc1aeac9acf2d51ad5103570beffd81d78b96
breaks PRIME sync i.e. Optimus hardware with nvidia binary driver, PRIME output and Sync (nvidia-drm.modeset=1 kernel parameter) active.
Symptoms differ slightly depending on system.
e.g. running gdm/gnome after about 10 seconds the display gets frozen including mouse pointer and I can move around a second mouse pointer to move around but no screen updates occur any more. No error messages or warnings, the xserver is running fine, I can switch to text console and back or zap the xserver but no more screen updates.
Another user reported running lightdm it take 1 min to see a login but screen updates occur every 30sec.
https://devtalk.nvidia.com/default/topic/1025005/linux/-modeset-1-xserver-1-19-4-won-t-work/
Reverting this commit or deactivating PRIME Sync by setting nvidia-drm.modeset=0  returns the xserver to normal operation.

Comment 1 Adam Jackson 2017-10-12 16:34:57 UTC

Reverted from 1.19 branch, will be in 1.19.5 shortly.

Comment 2 Maik Freudenberg 2017-10-14 11:40:33 UTC

(In reply to Adam Jackson from comment #1)
> Reverted from 1.19 branch, will be in 1.19.5 shortly.

1.19.5 works fine.
Thank you

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