[bisected] i915 regression in post 2.6.36 kernels

Johannes Hirte
2010-11-10T07:11:13Z

With the latest kernel, I don't get any windows in KDE displayed. After
starting kdm, I get the background picture and the mouse cursor but not the
login window. I can login blindly and a ps on console shows me that the
expected KDE processes are started but still nothing is displayed.
I've bisected this to:

5c12a07e8073295ce8b57a822f811ac34e4f8420 is the first bad commit
commit 5c12a07e8073295ce8b57a822f811ac34e4f8420
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date: Wed Sep 22 11:22:30 2010 +0100

drm/i915: Drop ring->lazy_request

We are not currently using it as intended, so remove the complication.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

hardware is a Gigabyte M912 with

00:00.0 Host bridge: Intel Corporation Mobile 945GME Express Memory Controller Hub (rev 03)
Subsystem: Giga-byte Technology Device 1999
Flags: bus master, fast devsel, latency 0
Capabilities: [e0] Vendor Specific Information: Len=09 <?>
Kernel driver in use: agpgart-intel

00:02.0 VGA compatible controller: Intel Corporation Mobile 945GME Express Integrated Graphics Controller (rev 03) (prog-if 00 [VGA controller])
Subsystem: Giga-byte Technology Device 1999
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at f2200000 (32-bit, non-prefetchable) [size=512K]
I/O ports at 18d0 [size=8]
Memory at d0000000 (32-bit, prefetchable) [size=256M]
Memory at f2300000 (32-bit, non-prefetchable) [size=256K]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable- Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Kernel driver in use: i915

00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)
Subsystem: Giga-byte Technology Device 1999
Flags: bus master, fast devsel, latency 0
Memory at f2280000 (32-bit, non-prefetchable) [disabled] [size=512K]
Capabilities: [d0] Power Management version 2

regards,
Johannes