[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <5698CB20.9050602@suse.cz>
Date: Fri, 15 Jan 2016 11:34:08 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
Ville Syrjälä <ville.syrjala@...ux.intel.com>,
Daniel Vetter <daniel.vetter@...ll.ch>, mgraesslin@....org
Cc: David Airlie <airlied@...ux.ie>, dri-devel@...ts.freedesktop.org,
LKML <linux-kernel@...r.kernel.org>,
Mario Kleiner <mario.kleiner.de@...il.com>, kwin@....org
Subject: linux-4.4 bisected: kwin5 stuck on kde5 loading screen with radeon
Hi,
since kernel 4.4 I'm unable to login to kde5 desktop (on openSUSE
Tumbleweed). There's a screen with progressbar showing the startup,
which normally fades away after reaching 100%. But with kernel 4.4, the
progress gets stuck somewhere between 1/2 and 3/4 (not always the same).
Top shows that kwin is using few % of CPU's but mostly sleeps in poll().
When I kill it from another console, I see that everything has actually
started up, just the progressbar screen was obscuring it. The windows
obviously don't have decorations etc. Starting kwin manually again shows
me again the progressbar screen at the same position.
I have suspected that kwin is waiting for some event, but nevertheless
tried bisecting the kernel between 4.3 and 4.4, which lead to:
# first bad commit: [4dfd64862ff852df7b1198d667dda778715ee88f] drm: Use
vblank timestamps to guesstimate how many vblanks were missed
I can confirm that 4.4 works if I revert the following commits:
63154ff230fc9255cc507af6277cd181943c50a1 "drm/amdgpu: Fixup hw vblank
counter/ts for new drm_update_vblank_count() (v3)"
d1145ad1e41b6c33758a856163198cb53bb96a50 "drm/radeon: Fixup hw vblank
counter/ts for new drm_update_vblank_count() (v2)"
31ace027c9f1f8e0a2b09bbf961e4db7b1f6cf19 "drm: Don't zero vblank
timestamps from the irq handler"
ac0567a4b132fa66e3edf3f913938af9daf7f916 "drm: Add DRM_DEBUG_VBL()"
4dfd64862ff852df7b1198d667dda778715ee88f "drm: Use vblank timestamps to
guesstimate how many vblanks were missed"
All clean reverts, just needs some fixup on top to use abs() instead of
abs64() due to 79211c8ed19c055ca105502c8733800d442a0ae6.
Unfortunately I don't know if this is a kernel problem or kwin problem.
I tried to CC maintainers of both, advices what to try or what info to
provide welcome. The card is "CAICOS" with 1GB memory.
Thanks,
Vlastimil
Powered by blists - more mailing lists