linux-kernel - X/gnome hang on EeePC with DRM and PAE

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Date:	Wed, 11 Mar 2009 15:48:36 -0700
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	Dave Airlie <airlied@...hat.com>
Cc:	linux-kernel@...r.kernel.org, jbarnes@...tuousgeek.org,
	eric@...olt.net
Subject: X/gnome hang on EeePC with DRM and PAE

X/gnome hangs on my EeePC (900HA) with latest git kernel when PAE is
enabled. X seems to start OK. I see the login screen and after entering
the password, I see initial gnome loading with desktop icons and stuff
and the desktops refreshed after a couple of seconds with complete white
background. I only see the mouse pointer on desktop which I can move
around. The system is alive in general and ssh-able. I see no errors in
dmesg. Attached is the config that reproduces the problem for me. I have
FC10 userspace.

If I disable PAE from this config, things work fine.

Initially, I saw the problem with latest git. But, I later saw the same
problem with .28 as well. Rolling back further, the problem was not
present in 2.6.28-rc3 and git bisect narrowed this regression to below
commit.

Thanks,
Venki

ac5c4e76180a74c7f922f6fa71ace0cef45fa433 is first bad commit
commit ac5c4e76180a74c7f922f6fa71ace0cef45fa433
Author: Dave Airlie <airlied@...hat.com>
Date:   Fri Dec 19 15:38:34 2008 +1000

    drm/i915: GEM on PAE has problems - disable it for now.

    On PAE systems, GEM allocates pages using shmem, and passes these
    pages to be bound into AGP, however the AGP interfaces + the x86
    set_memory interfaces all take unsigned long not dma_addr_t.

    The initial fix for this was a mess, so we need to do this correctly
    for 2.6.29.

    Signed-off-by: Dave Airlie <airlied@...hat.com>

:040000 040000 d468c858e0cf3f8b7f100004ed767cf7c005deef
8dfa48f29e9685f4cf2dd9b6655b21ec92525171 M      drivers

git bisect start
# good: [45beca08dd8b6d6a65c5ffd730af2eac7a2c7a03] Linux v2.6.28-rc3
git bisect good 45beca08dd8b6d6a65c5ffd730af2eac7a2c7a03
# bad: [4a6908a3a050aacc9c3a2f36b276b46c0629ad91] Linux 2.6.28
git bisect bad 4a6908a3a050aacc9c3a2f36b276b46c0629ad91
# good: [ee11940f8e7a2f064af22d52180cb5f9643eef61] cirrusfb: remove
unused variables
git bisect good ee11940f8e7a2f064af22d52180cb5f9643eef61
# good: [e1825e7515010053e44287e6e78f9078cd1916a9] Merge
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
git bisect good e1825e7515010053e44287e6e78f9078cd1916a9
# good: [061afe9fe1a295ef950cf7e6c92fa7d4ae226f28] Merge branch
'release' of
git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
git bisect good 061afe9fe1a295ef950cf7e6c92fa7d4ae226f28
# good: [3797455fd269f6ae0bc228d5206b502830af03f4] Merge
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6
git bisect good 3797455fd269f6ae0bc228d5206b502830af03f4
# bad: [8837e341cc76372716b1576dd88fbf832acd29d4] Merge branch
'for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
git bisect bad 8837e341cc76372716b1576dd88fbf832acd29d4
# good: [69098bac169d630a777b362470f20451b9446e39] Merge branch 'fixes'
of git://git.kernel.org/pub/scm/linux/kernel/git/hskinnemoen/avr32-2.6
git bisect good 69098bac169d630a777b362470f20451b9446e39
# good: [db873cfc7c0a6f34ab0f1c811fc245273adf35af] Merge branch
'for-linus' of git://neil.brown.name/md
git bisect good db873cfc7c0a6f34ab0f1c811fc245273adf35af
# good: [5bd9c69649754cd4b1a96cdbe5caa4e5d1d35eb5] Merge branch
'fix/asoc' into for-linus
git bisect good 5bd9c69649754cd4b1a96cdbe5caa4e5d1d35eb5
# bad: [f3485c82f75eeb951162dda663f45714627a85f5] Merge branch
'drm-fixes' of
git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6
git bisect bad f3485c82f75eeb951162dda663f45714627a85f5
# bad: [ac5c4e76180a74c7f922f6fa71ace0cef45fa433] drm/i915: GEM on PAE
has problems - disable it for now.
git bisect bad ac5c4e76180a74c7f922f6fa71ace0cef45fa433
# good: [c4de0a5d671e3af38dc3496538e391782aecc3a5] drm/i915: Don't
return busy for buffers left on the flushing list.
git bisect good c4de0a5d671e3af38dc3496538e391782aecc3a5

View attachment "pae.drm.config" of type "text/plain" (47803 bytes)