[stable] Regression in 2.6.32.2: radeon KMS hangs system
Johannes Hirte
radeon with modeset=1. I was able to connect via ssh, but after entering the
password nothing happend. I didn't got a prompt. Only SysRq worked. I've
tracked it down to the following patch:
From 500b758725314ab1b5316eb0caa5b0fa26740e6b Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexd...@gmail.com>
Date: Wed, 2 Dec 2009 11:46:52 -0500
Subject: drm/radeon/kms: handle vblanks properly with dpms on
From: Alex Deucher <alexd...@gmail.com>
commit 500b758725314ab1b5316eb0caa5b0fa26740e6b upstream.
avivo chips
Copied from pre-avivo code.
Signed-off-by: Alex Deucher <alexd...@gmail.com>
Signed-off-by: Dave Airlie <air...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@suse.de>
---
drivers/gpu/drm/radeon/atombios_crtc.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -241,6 +241,7 @@ void atombios_crtc_dpms(struct drm_crtc
{
struct drm_device *dev = crtc->dev;
struct radeon_device *rdev = dev->dev_private;
+ struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
switch (mode) {
case DRM_MODE_DPMS_ON:
@@ -248,20 +249,19 @@ void atombios_crtc_dpms(struct drm_crtc
if (ASIC_IS_DCE3(rdev))
atombios_enable_crtc_memreq(crtc, 1);
atombios_blank_crtc(crtc, 0);
+ drm_vblank_post_modeset(dev, radeon_crtc->crtc_id);
+ radeon_crtc_load_lut(crtc);
break;
case DRM_MODE_DPMS_STANDBY:
case DRM_MODE_DPMS_SUSPEND:
case DRM_MODE_DPMS_OFF:
+ drm_vblank_pre_modeset(dev, radeon_crtc->crtc_id);
atombios_blank_crtc(crtc, 1);
if (ASIC_IS_DCE3(rdev))
atombios_enable_crtc_memreq(crtc, 0);
atombios_enable_crtc(crtc, 0);
break;
}
-
- if (mode != DRM_MODE_DPMS_OFF) {
- radeon_crtc_load_lut(crtc);
- }
}
static void
After reverting this patch, modesetting works again. It's a Radeon HD3650 AGP
(RV635) on a Tyan Tiger K8W S2875ANRF (AMD 8151 AGP tunnel). Display is an
Acer X223W connected on DVI.
regards,
Johannes
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Michael Tokarev
> With 2.6.32.2 the system hangs completely with black screen when modprobing
> radeon with modeset=1. I was able to connect via ssh, but after entering the
> password nothing happend. I didn't got a prompt. Only SysRq worked. I've
> tracked it down to the following patch:
>
> From 500b758725314ab1b5316eb0caa5b0fa26740e6b Mon Sep 17 00:00:00 2001
> From: Alex Deucher <alexd...@gmail.com>
> Date: Wed, 2 Dec 2009 11:46:52 -0500
> Subject: drm/radeon/kms: handle vblanks properly with dpms on
Confirmed here on amd780g chipset. I was about to debug/bisect the issue
right when the email arrived. Reverting this patch makes my system bootable
again.
/mjt
> From: Alex Deucher <alexd...@gmail.com>
>
> commit 500b758725314ab1b5316eb0caa5b0fa26740e6b upstream.
>
> avivo chips
>
> Copied from pre-avivo code.
>
> Signed-off-by: Alex Deucher <alexd...@gmail.com>
> Signed-off-by: Dave Airlie <air...@redhat.com>
> Signed-off-by: Greg Kroah-Hartman <gre...@suse.de>
...
Alex Deucher
<johanne...@fem.tu-ilmenau.de> wrote:
> With 2.6.32.2 the system hangs completely with black screen when modprobing
> radeon with modeset=1. I was able to connect via ssh, but after entering the
> password nothing happend. I didn't got a prompt. Only SysRq worked. I've
> tracked it down to the following patch:
>
Fixed here:
http://marc.info/?l=dri-devel&m=126137027403059&w=2
2.6.32 didn't have irq support for r6xx+.
Alex
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